Functional Plant Biology

Faculties

Prof. Kouichi SOGA (soga@omu.ac.jp)

Assoc. Prof. Kazuyuki WAKABAYASHI (kazuwakaba@omu.ac.jp)

Overview of Research

Plants are subjected to a great variety of environmental signals such as light, gravity, water, and temperature. These signals strongly modify the processes of growth and development, by which they control the life cycle of plants. We have been studying the mechanisms of growth regulation and morphogenesis by environmental signals in higher plants. In the process of receiving signals from the environment and responding to them, various plant functions are regulated. We are interested in mechanisms of the whole of the processes, and studying them with a combination of physiological, biochemical, molecular biological, morphological, and physical approaches. One of the themes we are currently focusing is the mechanism of gravity responses in plants. We are analyzing them with both space and ground-based experiments.

English Publications

2024

Watanabe Y, Yamamoto H, Shimizu I, Hongo H, Noguchi A, Fujii N, Hoson T, Wakabayashi K and Soga K (2024) Suppression of essential oil biosynthesis in sweet basil cotyledons under hypergravity conditions. Life Sci. Space Res. 42: 1-7. doi: 10.1016/j.lssr.2024.04.002
Hoson T, Soga K, Wakabayashi K, Hedrich R, Suzuki M, Muranaka T, Hashimoto T, Hashimoto H, Yano S, Matsumoto S, Kasahara H, Kamada M and Shimazu T (2024) Suppression of bolting in the Arabidopsis hmg1 mutant under microgravity conditions in space – Possible involvement of lipid rafts. Biol. Sci. Space. 38: 18-26. doi: 10.2187/bss.38.18
Takahashi D, Soga K, Kikuchi T, Kutsuno T, Hao P, Sasaki K, Nishiyama Y, Kidokoro S, Sampathkumar A, Bacic A, Johnson KL and Kotake T (2024) Structural changes in cell wall pectic polymers contribute to freezing tolerance induced by cold acclimation in plants. Current Biol. 34: 958-968. doi: 10.1016/j.cub.2024.01.045
Saeki Y, Wakabayashi K, Hoson T, Sasaki H, Oka M, Kitaya Y, Miyamoto K and Soga K(2024) Effects of hypergravity in a centrifuge and simulated microgravity on a horizontal clinostat on tuber formation in single-nodal stem segments from potato (Solanum tuberosum L.) sprouts. Biol. Sci. Space 38: 8-17. doi: 10.2187/bss.38.8

2023

Kikukawa K, Takigawa-Imamura H, Soga K, Kotake T and Higaki T (2023) Smooth elongation of pavement cells induced by RIC1 overexpression leads to marginal protrusions of the cotyledon in Arabidopsis thaliana. Plant Cell Physiol. 64: 1356-1371. doi: 10.1093/pcp/pcad094
Miwa Y, Awanthi MGG, Soga K, Tanaka A, Ito M, Numata Y, Sato Y and Konishi T (2023) The cell wall characterization of brown alga Cladosiphon okamuranus during growth. Plants 12: 3274. doi: 10.3390/plants12183274
Sakaki T, Koizumi T, Ikeido Y, Soga K, Wakabayashi K and Hoson T (2023) Increase in steryl glycoside levels and stimulation of lipid raft formation in azuki bean epicotyls under hypergravity conditions. Life Sci. Space Res. 38: 53-58. doi: 10.1016/j.lssr.2023.05.005
Wakabayashi K, Soga K, Hoson T and Masuda H (2023) The modification of cell wall properties is involved in the growth inhibition of rice coleoptiles induced by lead stress. Life 13: 471. doi: 10.3390/life13020471
Yamaguchi A, Soga K, Wakabayashi K and Hoson T (2023) Modification of xyloglucan metabolism during a decrease in cell wall extensibility in 1-aminocyclopropane-1-carboxylic acid-treated azuki bean epicotyls. Plants 12: 367. doi: 10.3390/plants12020367

2022

Kikuchi A, Hara K, Yoshimi Y, Soga K, Takahashi D and Kotake T (2022) In vivo structural modification of type II arabinogalactans with fungal endo-β-1,6-galactanase in Arabidopsis. Front. Plant Sci. 13: 1010492. doi: 10.3389/fpls.2022.1010492
Hattori T, Soga K, Wakabayashi K and Hoson T (2022) An Arabidopsis PTH2 gene is responsible for gravity resistance supporting plant growth under different gravity conditions. Life 12: 1603. doi: 10.3390/life12101603
Tanimura Y, Mabuchi A, Soga K, Wakabayashi K, Hashimoto H, Yano S, Matsumoto S, Kasahara H, Kamada M, Shimazu T, Hashimoto T and Hoson T (2022) Suppression of secondary wall formation in the basal supporting region of Arabidopsis inflorescence stems under microgravity conditions in space. Biol. Sci. Space 36: 1-8. doi: 10.2187/bss.36.1
Kato S, Murakami M, Saika R, Soga K, Wakabayashi K, Hashimoto H, Yano S, Matsumoto S, Kasahara S, Kamada M, Shimazu T, Hashimoto T and Hoson T (2022) Suppression of cortical microtubule reorientation and stimulation of cell elongation in Arabidopsis hypocotyls under microgravity conditions in space. Plants 11: 465. doi: 10.3390/plants11030465

2021

Soga-Morimoto A, Soga K, Wakabayashi K, Kamisaka S and Hoson T (2021) Suppression of sugar accumulation in coleoptile and mesocotyl cells by light irradiation to etiolated maize seedlings. J. Plant Physiol. 260: 153409.doi: 10.1016/j.jplph.2021.153409
Soga K, Yano S, Kamada M, Matsumoto S and Hoson T (2021) Understanding the mechanisms of gravity resistance in plants. In Plant Gravitropism Second Edition: Methods and Protocols (Ed. Blancaflor EB). Methods Mol. Biol. p. 267-279. doi: 10.1007/978-1-0716-1677-2_17

2020

Yamaguchi M and Soga K (2020) Hemolymph composition, gene expressions in the gills, and thus the survival of euryhaline crabs are controlled by ambient minor cations according to osmotic condition-dependent manner. Ecol. Evol. 10: 12183-12199. doi: 10.1002/ece3.6846
Karahara I, Suto T, Yamaguchi T, Yashiro U, Tamaoki D, Okamoto E, Yano S, Tanigaki F, Shimazu T, Kasahara H, Kasahara H, Yamada M, Hoson T, Soga K and Kamisaka S (2020) Vegetative and reproductive growth of Arabidopsis under microgravity conditions in space. J. Plant Res. 133: 571-585. doi: 10.1007/s10265-020-01200-4
Hattori T, Otomi Y, Nakajima Y, Soga K, Wakabayashi K, Iida H and Hoson T (2020) MCA1 and MCA2 are involved in the response to hypergravity in Arabidopsis hypocotyls. Plants 9: 590. doi: 10.3390/plants9050590
Wakabayashi K, Soga K, Hoson T, Kotake T, Yamazaki T, Ishioka N, Shimazu T and Kamada M (2020) Microgravity affects the level of matrix polysaccharide 1,3:1,4-beta-glucans in cell walls of rice shoots by increasing the expression level of a gene involved in their breakdown. Astrobiol. 20: 820-829. doi: 10.1089/ast.2019.2140

2019

Inui K, Soga K, Wakabayashi K and Hoson T (2019) Centrifugal displacement of nuclei in epidermal cells of azuki bean epicotyls. Biol. Sci. Space 33: 1-6. doi: 10.2187/bss.33.1

2018

Tanabe H, Soga K, Wakabayashi K and Hoson T (2018) Dynamics of actin filaments in epidermal cells of azuki bean epicotyls under hypergravity conditions. Biol. Sci. Space 32: 11-16. doi: 10.2187/bss.32.11
Soga K, Wakabayashi K and Hoson T (2018) Growth and cortical microtubule dynamics in shoot organs under microgravity and hypergravity conditions. Plant Signal. Behav. 13: e1422468. doi: 10.1080/15592324.2017.1422468
Soga K, Yamazaki C, Kamada M, Tanigawa N, Kasahara H, Yano S, Kojo KH, Kutsuna N, Kato T, Hashimoto T, Kotake T, Wakabayashi K and Hoson T (2018) Modification of growth anisotropy and cortical microtubule dynamics in Arabidopsis hypocotyls grown under microgravity conditions in space. Physiol. Plant. 162: 135-144. doi: 10.1111/ppl.12640

2017

Wakabayashi K, Soga K, Hoson T, Kotake T, Kojima M, Sakakibara H, Yamazaki T, Higashibata A, Ishioka N, Shimazu T and Kamada M (2017) Persistence of plant hormone levels in rice shoots grown under microgravity conditions in space: its relationship to maintenance of shoot growth. Physiol. Plant. 161: 285-293. doi: 10.1111/ppl.12591

2016

Murakami M, Soga K, Kotake T, Kato T, Hashimoto T, Wakabayashi K and Hoson T (2016) Roles of MAP65-1 and BPP1 in gravity resistance of Arabidopsis hypocotyls. Biol. Sci. Space 30: 1-7. doi: 10.2187/bss.30.1
Mabuchi A, Soga K, Wakabayashi K and Hoson T (2016) Phenotypic screening of Arabidopsis T-DNA insertion lines for cell wall mechanical properties revealed ANTHOCYANINLESS2, a cell wall-related gene. J. Plant Physiol. 191: 29-35. doi: 10.1016/j.jplph.2015.11.011

2015

Wakabayashi K, Soga K, Hoson T, Kotake T, Yamazaki T, Higashibata A, Ishioka N, Shimazu T, Fukui K, Osada I, Kasahara H and Kamada M (2015) Suppression of hydroxycinnamate network formation in cell walls of rice shoots grown under microgravity conditions in space. PLoS ONE 10: e0137992. doi: 10.1371/journal.pone.0137992
Hossain MT, Soga K, Wakabayashi K and Hoson T (2015) Effects of lead toxicity on growth and cell wall extensibility in rice seedlings. Bangladesh J. Bot. 44(2): 333-336.
Soga K, Yano S, Matsumoto S and Hoson T (2015) Hypergravity experiments to evaluate gravity resistance mechanisms in plants. In Plant Gravitropism: Methods and Protocols (Ed. Blancaflor EB). Methods Mol. Biol. p. 307-319.doi: 10.1007/978-1-4939-2697-8_21
Hoson T and Wakabayashi K (2015) Role of the plant cell wall in gravity resistance. Phytochemistry 112: 84-90. doi: 10.1016/j.phytochem.2014.08.022

2014

Soga K, Biology Club, Kurita A, Yano S, Ichikawa T, Kamada M and Takaoki M (2014) Growth and morphogenesis of azuki bean seedlings in space during SSAF2013 program. Biol. Sci. Space 28: 6-11. doi: 10.2187/bss.28.6
Hoson T, Soga K, Wakabayashi K, Hashimoto T, Karahara I, Yano S, Tanigaki F, Shimazu T, Kasahara H, Masuda D and Kamisaka S (2014) Growth stimulation in inflorescences of an Arabidopsis tubulin mutant under microgravity conditions in space. Plant Biol.16(S1):91-96. doi: 10.1111/plb.12099

2013

Soga K (2013) Resistance of plants to gravitational force. J. Plant Res. 126: 589-596. doi: 10.1007/s10265-013-0572-4
Yano S, Kasahara H, Masuda D, Tanigaki F, Shimazu T, Suzuki H, Karahara I, Soga K, Hoson T, Tayama I, Tsuchiya Y and Kamisaka S (2013) Improvements in and actual performance of the Plant Experiment Unit onboard Kibo, the Japanese Experiment Module on the International Space Station. Adv. Space Res. 51: 780-788. doi: 10.1016/j.asr.2012.10.002
Zhang Y, Soga K, Wakabayashi K and Hoson T (2013) Effects of gravistimuli on osmoregulation in azuki bean epicotyls. Adv. Space Res. 51: 458-464. doi: 10.1016/j.asr.2012.09.013

2012

Yano S, Masuda D, Kasahara H, Omori K, Higashibata A, Asashima M, Ohnishi T, Yatagai F, Kamisaka S, Furusawa T, Higashitani A, Majima HJ, Nikawa T, Wakabayashi K, Takahashi H, Suzuki H, Shimazu T, Fukui K, Hattori A, Tanigaki F, Shirakawa M, Nakamura T, Yoshimura Y, Suzuki N and Ishioka N (2012) Excellent thermal control ability of Cell Biology Experiment Facility (CBEF) for ground based experiments and experiments onboard the Kibo Japanese experiment module of International Space Station. Biol. Sci. Space 26: 12-20. doi: 10.2187/bss.26.12
Hoson T, Akamatsu H, Soga K, Wakabayashi K, Hashimoto H, Yamashita M, Hasegawa K, Yano S, Omori K, Ishioka N, Matsumoto S, Kasahara H, Shimazu T, Baba SA and Hashimoto T (2012)　Objectives, outlines, and preparation for the Resist Tubule space experiment to understand the mechanism of gravity resistance in plants. Aerospace Technol. Japan 10: Tp 1-5. doi:10.2322/tastj.10.Tp_1
Soga K, Kotake T, Wakabayashi K and Hoson T (2012) Changes in the transcript levels of microtubule-associated protein MAP65-1 during reorientation of cortical microtubules in azuki bean epicotyls. Acta Physiol. Plant. 34: 533-540. doi:10.1007/s11738-011-0850-5
Wakabayashi K, Soga K and Hoson T (2012) Phenylalanine ammonia-lyase and cell wall peroxidase are cooperatively involved in the extensive formation of ferulate network in cell walls of developing rice shoots. J. Plant Physiol. 169: 262-267. doi:10.1016/j.jplph.2011.10.002

2011

Wakabayashi K, Soga K and Hoson T (2011) Cell wall oxalate oxidase modifies the ferulate metabolism in cell walls of wheat shoots. J. Plant Physiol. 168: 1997-2000. doi:10.1016/j.plph.2011.05.010

2010

Soga K (2010) Gravity resistance in plants. Biol. Sci. Space 24: 129-134. doi: 10.2187/bss.24.129
Soga K, Yamaguchi A, Kotake T, Wakabayashi K and Hoson T (2010) Transient increase in the levels of γ-tubulin complex and katanin are responsible for reorientation by ethylene and hypergravity of cortical microtubules. Plant Signal. Behav. 5: 1480-1482. doi: 10.4161/psb.5.11.13561
Soga K, Yamaguchi A, Kotake T, Wakabayashi K and Hoson T (2010) 1-Aminocyclopropane-1-carboxylic acid (ACC)-induced reorientation of cortical microtubules is accompanied by a transient increase in the transcript levels of γ-tubulin complex and katanin genes in azuki bean epicotyls. J. Plant Physiol. 167: 1165-1171. doi:10.1016/j.jplph.2010.04.001
Hoson T, Matsumoto S, Soga K and Wakabayashi K (2010) Cortical microtubules are responsible for gravity resistance in plants. Plant Signal. Behav. 5: 752-754. doi: 10.4161/psb.5.6.11706
Arai K, Wakabayashi K, Soga K and Hoson T (2010) Fucosylated high molecular mass but not non-fucosylated low molecular mass xyloglucans undergo an extensive depolymerization in cell walls of azuki bean epicotyls. J. Plant Physiol. 167: 800-804. doi:10.1016/j.jplph.2010.01002
Matsumoto S, Kumasaki S, Soga K, Wakabayashi K, Hashimoto T and Hoson T (2010) Gravity-induced modifications to development in hypocotyls of Arabidopsis tubulin mutants. Plant Physiol. 152: 918-926. doi:10.1104/pp.109.147330

2009

Hoson T, Soga K and Wakabayashi K (2009) Role of the cell wall-sustaining system in gravity resistance in plants. Biol. Sci. Space 23: 131-136. doi: 10.2187/bss.23.131
Wakabayashi K, Soga K and Hoson T (2009) Modification of cell wall architecture in gramineous plants under altered gravity conditions. Biol. Sci. Space 23: 137-142. doi: 10.2187/bss.23.137
Kotake T, Hirata N, Kitazawa K, Soga K and Tsumuraya Y (2009) Arabinogalactan-proteins in the evolution of gravity resistance in land plants. Biol. Sci. Space 23: 143-149. doi: 10.2187/bss.23.143
Hoson T, Matsumoto S, Soga K, Wakabayashi K, Hashimoto T, Sonobe S, Muranaka T, Kamisaka S, Kamada M, Omori K, Ishioka N and Shimazu T (2009) Growth and cell wall properties in hypocotyls of Arabidopsis tua6 mutant under microgravity conditions in space. Biol. Sci. Space 23: 71-76. doi: 10.2187/bss.23.71
Soga K, Kotake T, Wakabayashi K, Kamisaka S and Hoson T (2009) The transcript level of katanin gene is increased transiently in response to changes in gravitational conditions in azuki bean epicotyls. Biol. Sci. Space 23: 23-28. doi: 10.2187/bss.23.23
Wakabayashi K, Nakano S, Soga K and Hoson T (2009) Cell wall-bound peroxidase activity and lignin formation in azuki bean epicotyls grown under hypergravity conditions. J. Plant Physiol. 166: 947-954．doi:10.1016/j.jplph.2008.12.006
Ooume K, Inoue Y, Soga K, Wakabayashi K, Fujii S, Yamamoto R and Hoson T (2009) Cellular basis of growth suppression by submergence in azuki bean epicotyls. Ann. Bot. 103: 325-332. doi:10.1093/aob/mcn198

2008

Soga K, Kotake T, Wakabayashi K, Kamisaka S and Hoson T (2008) Transient increase in the transcript levels of γ-tubulin complex genes during reorientation of cortical microtubules by gravity in azuki bean (Vigna angularis) epicotyls. J. Plant Res. 121: 493-498. doi:10.1007/s10265-008-0179-3
Hoson T, Matsumoto S, Soga K, Wakabayashi K, Hashimoto T, Sonobe S, Muranaka T, Kamisaka S, Kamada M, Omori K, Ishioka N and Shimazu T (2008) The Resist Wall experiment on EMCS. J. Gravit. Physiol. 15: 303-304.
Kimpara T, Aohara T, Soga K, Wakabayashi K, Hoson T, Tsumuraya Y and Kotake T (2008) β-1,3:1,4-Glucan synthase activity in rice seedlings under water. Ann. Bot. 102: 221-226. doi:10.1093/aob/mcn077
Ikushima T, Soga K, Hoson T and Shimmen T (2008) Role of xyloglucan in gravitropic bending of azuki bean epicotyl. Physiol. Plant. 132: 552-565. doi:10.1111/j.1399-3054.2007.01047.x

2007

Nakano S, Soga K, Wakabayashi K and Hoson T (2007) Different cell wall polysaccharides are responsible for gravity resistance in the upper and the basal regions of azuki bean epicotyls. Biol. Sci. Space 21: 113-116. doi: 10.2187/bss.21.113
Hoson T, Matsumoto S, Soga K, Wakabayashi K, Hashimoto T, Sonobe S, Muranaka T, Kamisaka S, Kamada M, Omori K, Ishioka N and Shimazu T (2007) The Outline and Significance of the Resist Wall Experiment: Role of Microtubule-Membrane-Cell Wall Continuum in Gravity Resistance in Plants. Biol. Sci. Space 21: 56-61. doi: 10.2187/bss.21.56
Soga K, Wakabayashi K, Kamisaka S and Hoson T (2007) Effects of hypergravity on expression of XTH genes in azuki bean epicotyls. Physiol. Plant. 131: 332-340. doi:10.1111/j.1399-3054.2007.00949.x
Soga K, Arai K, Wakabayashi K, Kamisaka S and Hoson T (2007) Modifications of xyloglucan metabolism in azuki bean epicotyls under hypergravity conditions. Adv. Space Res. 39: 1204-1209. doi:10.1016/j.asr.2006.12.011
Koizumi T, Sakaki T, Usui S, Soga K, Wakabayashi K and Hoson T (2007) Changes in membrane lipid composition in azuki bean epicotyls under hypergravity conditions: Possible role of membrane sterols in gravity resistance. Adv. Space Res. 39: 1198-1203. doi:10.1016/j.asr.2007.02.040
Matsumoto S, Saito Y, Kumasaki S, Soga K, Wakabayashi K and Hoson T (2007) Up-regulation of expression of tubulin genes and roles of microtubules in hypergravity-induced growth modification in Arabidopsis hypocotyls. Adv. Space Res. 39: 1176-1181. doi:10.1016/j.asr.2007.03.074
Hossain MT, Soga K, Wakabayashi K, Kamisaka S, Fujii S, Yamamoto R and Hoson T (2007) Modification of chemical properties of cell walls by silicon and its role in regulation of the cell wall extensibility in oat leaves．J．Plant Physiol．164: 385-393. doi:10.1016/j.jplph.2006.02.003
Lee EJ, Matsumura Y, Soga K, Hoson T and Koizumi N (2007) Glycosyl hydrolases of cell wall are induced by sugar starvation in Arabidopsis. Plant Cell Physiol. 48: 405-413. doi:10.1093/pcp/pcm009

2006

Soga K, Wakabayashi K, Kamisaka S and Hoson T (2006) Hypergravity induces reorientation of cortical microtubules and modifies growth anisotropy in azuki bean epicotyls. Planta 224: 1485-1494. doi:10.1007/s00425-006-0319-8
Saito T, Soga K, Hoson T and Terashima I (2006) The bulk elastic modulus and the reversible properties of cell walls in developing Quercus leaves. Plant Cell Physiol. 47: 715-725. doi:10.1093/pcp/pcj042
Nakabayashi I, Karahara I, Tamaoki D, Masuda K, Wakasugi T, Yamada K, Soga K, Hoson T and Kamisaka S (2006) Hypergravity stimulus enhances primary xylem development and decreases mechanical properties of secondary cell walls in inflorescence stems of Arabidopsis thaliana．Ann．Bot． 97: 1083-1090. doi:10.1093/aob/mcl055

2005

Wakabayashi K, Soga K, Kamisaka S and Hoson T (2005) Increase in the level of arabinoxylan-hydroxycinnamate network in cell walls of wheat coleoptiles grown under continuous hypergravity conditions. Physiol. Plant. 125: 127-134. doi:10.1111/j.1399-3054.2005.00544.x
Saiki M, Fujita H, Soga K, Wakabayashi K, Kamisaka S, Yamashita M and Hoson T (2005) Cellular basis for the automorphic curvature of rice coleoptiles on a three-dimensional clinostat: Possible involvement of reorientation of cortical microtubules. J. Plant Res. 118: 199-205. doi:10.1007/s10265-005-0210-x
Hoson T, Saito Y, Soga K and Wakabayashi K (2005) Signal perception, transduction, and response in gravity resistance. Another graviresponse in plants. Adv. Space Res. 36: 1196-1202. doi:10.1016/j.asr.2005.04.095
Wakabayashi K, Soga K, Kamisaka S and Hoson T (2005) Changes in levels of cell wall constituents in wheat seedlings grown under continuous hypergravity conditions. Adv. Space Res. 36: 1292-1297. doi:10.1016/j.asr.2005.02.066
Soga K, Wakabayashi K, Kamisaka S and Hoson T (2005) Hypergravity inhibits elongation growth of azuki bean epicotyls independently of the direction of stimuli. Adv. Space Res. 36: 1269-1276. doi:10.1016/j.asr.2005.05.029
Soga K, Wakabayashi K, Kamisaka S and Hoson T (2005) Mechanoreceptors rather than sedimentable amyloplasts perceive the gravity signal in hypergravity-induced inhibition of root growth in azuki bean. Funct. Plant Biol. 32: 175-179. doi:10.1071/FP04145

2004

Hoson T, Soga K, Mori R, Saiki M, Nakamura Y, Wakabayashi K and Kamisaka S (2004) Cell wall changes involved in the automorphic curvature of rice coleoptiles under microgravity conditions in space. J. Plant Res. 117: 449-455. doi:10.1007/s10265-004-0182-2
Soga K, Wakabayashi K, Kamisaka S and Hoson T (2004) Graviperception in growth inhibition of plant shoots under hypergravity conditions produced by centrifugation is independent of that in gravitropism and may involve mechanoreceptors. Planta 218: 1054-1061. doi:10.1007/s00425-003-1187-0
Uno-Okamura K, Soga K, Wakabayashi K, Kamisaka S and Hoson T (2004) Purification and properties of apoplastic amylase from oat (Avena sativa L.) seedlings. Physiol. Plant. 121: 117-123. doi:10.1111/j.0031-9317.2004.00298.x
Kaku T, Tabuchi A, Wakabayashi K and HosonT (2004) Xyloglucan oligosaccharides cause cell wall loosening by enhancing xyloglucan endotransglucosylase/hydrolase activity in azuki bean epicotyls. Plant Cell Physiol. 45: 77-82. doi: 10.1093/pcp/pch007

2003

Hoson T and Soga K (2003) New aspects of gravity responses in plant cells. Int. Rev. Cytol. 229: 209-244. doi:10.1016/S0074-7696(03)29005-7
Soga K, Wakabayashi K, Kamisaka S and HosonT (2003) Growth restoration in azuki bean and maize seedlings by removal of hypergravity stimuli. Adv. Space Res. 31: 2269-2274. doi:10.1016/S0273-1177(03)00254-0
Yoshioka R, Soga K, Wakabayashi K, Takeba G and Hoson T (2003) Hypergravity-induced changes in gene expression in Arabidopsis hypocotyls. Adv. Space Res. 31: 2187-2193. doi:10.1016/S0273-1177(03)00243-6
Hoson T, Soga K, Wakabayashi K, Kamisaka S and Tanimoto E (2003) Growth and cell wall changes in rice roots during spaceflight. Plant Soil 255: 19-26. doi:10.1023/A:1026105431505
Wakabayashi K, Hoson T and Huber DJ (2003) Methyl de-esterification as a major factor regulating the extent of pectin depolymerization during fruit ripening: a comparison of the action of avocado (Persea americana) and tomato (Lycopersicon esculentum) polygalacturonases. J. Plant Physiol.160: 667-673. doi:10.1078/0176-1617-00951
Nakamura Y, Wakabayashi K and Hoson T (2003) Temperature modulates the cell wall mechanical properties of rice coleoptiles by altering the molecular mass of hemicellulosic polysaccharides. Physiol. Plant 118: 597-604. doi:10.1034/j.1399-3054.2003.00144.x
Tokumoto H, Wakabayashi K, Kamisaka S, and Hoson T (2003) Xyloglucan breakdown during cotton fiber development. J. Plant Physiol.160: 1411-1414. doi:10.1078/0176-1617-01066

2002

Soga K, Wakabayashi K, Kamisaka S and Hoson T (2002) Stimulation of elongation growth and xyloglucan breakdown in Arabidopsis hypocotyls under microgravity conditions in space. Planta 215: 1040-1046. doi:10.1007/s00425-002-0838-x
Hoson T, Soga K, Mori R, Saiki M, Nakamura Y, Wakabayashi K and Kamisaka S (2002) Stimulation of elongation growth and cellwall loosening in rice coleoptiles under microgravity conditions in space. Plant Cell Physiol. 43: 1067-1071. doi:10.1093/pcp/pcf126
Nakamura Y, Wakabayashi K, Kamisaka S and Hoson T (2002) Effects of temperature on the cell wall and osmotic properties in dark-grown rice and azuki bean seedlings. J. Plant Res. 115: 455-461. doi:10.1007/s10265-002-0058-2
Hossain MT, Mori R, Soga K, Wakabayashi K, Kamisaka S, Fujii S, Yamamoto R and Hoson T (2002) Growth promotion and increasein cell wall extensibility by silicon in rice and some other Poaceae seedlings. J. Plant Res. 115: 23-27. doi:10.1007/s102650200004
Tokumoto H, Wakabayashi K, Kamisaka S and Hoson T (2002) Changes in the sugar composition and molecular mass distribution of matrix polysaccharides during cell elongation of cotton fibers. Plant Cell Physiol. 43: 411-418. doi:10.1093/pcp/pcf048
Kaku T, Tabuchi A, Wakabayashi K, Kamisaka S and Hoson T (2002) Action of xyloglucan hydrolase within the native cell wall architecture and its effect on cell wall extensibility in azuki bean epicotyls. Plant Cell Physiol. 43: 21-26. doi:10.1093/pcp/pcf004

2001

Soga K, Wakabayashi K, Hoson T and Kamisaka S (2001) Gravitational force regulates elongation growth of Arabidopsis hypocotyls by modifying xyloglucan metabolism. Adv. Space Res. 27: 1011-1016. doi:10.1016/S0273-1177(01)00176-4
Hoson T, Saiki M, Kamisaka S and Yamashita M (2001) Automorphogenesis and gravitropism of plant seedlings grown under microgravity conditions. Adv. Space Res. 27: 933-940. doi:10.1016/S0273-1177(01)00157-0
Wakabayashi K, Soga K, Hoson T, Kamisaka S,Yoshimura H and Shibata K (2001) Growth inhibition of lettuce (Lactuca sativa L.) roots by α-amino acids, 2-amino-3-cyclopropyl-butanoic acidand 2-amino-5-chloro-4-pentenoic acid, isolated from Amanita castanopsidis Hongo. Plant Growth Regul. 33: 169-173. doi:10.1023/A:1017527421294
Wakabayashi K. and Huber DJ (2001) Purification and catalytic properties of polygalacturonase isoforms from ripe avocado (Persea americana) fruit mesocarp. Physiol. Plant. 113: 210-216. doi:10.1034/j.1399-3054.2001.1130208.x
Tabuchi A, Mori H, Kamisaka S and Hoson T (2001) A new type of endo-xyloglucan transferase devoted to xyloglucan hydrolysis in the cell wall of azuki bean epicotyls. Plant Cell Physiol. 42: 154-161. doi:10.1093/pcp/pce016

2000

Soga K, Wakabayashi K, Hoson T and Kamisaka S (2000) Flower stalk segments of Arabidopsis thaliana ecotype Columbia lack the capacity to grow in response to exogenously applied auxin. Plant Cell Physiol. 41: 1327-1333. doi:10.1093/pcp/pcd066
Soga K, Wakabayashi K, Hoson T and Kamisaka S (2000) Hypergravity-induced increase in the apoplastic pH and its possible involvement in suppression of β-glucan breakdown in maize seedlings. Aust. J. Plant Physiol. 27: 967-972. doi:10.1071/PP00035
Soga K, Wakabayashi K, Hoson T and Kamisaka S (2000) Changes in the apoplastic pH are involved in regulation of xyloglucan breakdown of azuki bean epicotyls under hypergravity conditions. Plant Cell Physiol. 41: 509-514. doi:10.1093/pcp/41.4.509
Wakabayashi K (2000) Changes in cell wall polysaccharides during fruit ripening. J. Plant Res. 113: 231-237. doi:10.1007/PL00013932
Wakabayashi K, Chun J-P and Huber DJ (2000) Extensive solubilization and depolymerization of cell wall polysaccharides during avocado (Persea americana) ripening involves concerted action of polygalacturonase and pectinmethylesterase. Physiol. Plant. 108: 345-352. doi:10.1034/j.1399-3054.2000.t01-1-100402.x
Hoson T, Kamisaka S, Wakabayashi K, Soga K, Tabuchi A, Tokumoto H, Okamura K, Nakamura Y, Mori R, Tanimoto E, Takeba G, Nishitani K, Izumi R, Ishioka N, Kamigaichi S, Aizawa S, Yoshizaki I, Shimazu T and Fukui K (2000) Growth regulation mechanisms in higher plants under microgravity conditions - Changes in cell wall metabolism. Biol. Sci. Space 14: 75-96. doi:10.2187/bss.14.75
Rahman A, Tsurumi S, Amakawa T, Soga K, Hoson T, Goto N and Kamisaka S (2000) Involvement of ethylene and gibberellin signalings in chromosaponin I-induced cell division and cell elongation in the roots of Arabidopsis seedlings. Plant Cell Physiol. 41: 1-9. doi:10.1093/pcp/41.1.1
Tsurumi S, Ishizawa K, Soga K, Hoson T, Goto N and Kamisaka S (2000) Effects of chromosaponin I and brassinolide on the growth of roots in etiolated Arabidopsis seedlings. J. Plant Physiol. 156: 60-67. doi:10.1016/S0176-1617(00)80273-4
Kawamura Y, Wakabayashi K, Hoson T, Yamamoto R and Kamisaka S (2000) Stress-relaxation analysis of submerged and air-grown rice coleoptiles. Correlations with cell wall biosynthesis and growth. J. Plant Physiol. 156: 689-694. doi:10.1016/S0176-1617(00)80233-3

1999

Soga K, Wakabayashi K, Hoson T and Kamisaka S (1999) Hypergravity increases the molecular mass of xyloglucans by decreasing xyloglucan-degrading activity in azuki bean epicotyls. Plant Cell Physiol. 40: 581-585. doi:10.1093/oxfordjournals.pcp.a029580
Soga K, Harada K, Wakabayashi K, Hoson T and Kamisaka S (1999) Increased molecular mass of hemicellulosic polysaccharides is involved in growth inhibition of maize coleoptiles and mesocotyls under hypergravity conditions. J. Plant Res. 112: 273-278. doi:10.1007/PL00013881
Soga K, Wakabayashi K, Hoson T and Kamisaka S (1999) Inhibition of reproductive growth of Arabidopsis in airtight vessels. Adv. Space Res. 23: 2037-2040. doi:10.1016/S0273-1177(99)00346-4
Wakabayashi K, Hoson T and Sakurai N (1999) Auxin stimulates the synthesis but not the loosening of cell walls in isolated outer tissue of dark-grown squash ( Cucurbita maxima Duch.) hypocotyls. J. Plant Physiol. 154: 197-202. doi:10.1016/S0176-1617(99)80210-7
Hoson T, Soga K, Mori R, Saiki M, Wakabayashi K, Kamisaka S, Kamigaichi S, Aizawa S, Yoshizaki I, Mukai C, Shimazu T, Fukui K and Yamashita M (1999) Morphogenesis of rice and Arabidopsis seedlings in space. J. Plant Res. 112: 477-486. doi:10.1007/PL00013903
Miyamoto K, Yamamoto R, Fujii S, Soga K, Hoson T, Shimazu T, Masuda Y, Kamisaka S and Ueda J (1999) Growth and development in Arabidopsis thaliana through an entire life cycle under simulated microgravity conditions on a clinostat. J. Plant Res. 112: 413-418. doi:10.1007/PL00013865
Miyamoto K, Oka M, Ueda J, Yamamoto R, Masuda Y, Hoson T and Kamisaka S (1999) Auxin polar transport in Arabidopsis under simulated microgravity conditions - Relevance to growth and development. Adv. Space Res. 23: 2033-2036. doi:10.1016/S0273-1177(99)00344-0
Yoshimura H, Takegami K, Doe M, Yamashita T, Shibata K, Wakabayashi K, Soga K and Kamisaka S (1999) α-Amino acids from a mushroom, Amanita castanopsidis Hongo with growth-inhibiting activity. Phytochemistry 52: 25-27. doi:10.1016/S0031-9422(99)00162-4
Morita A, Soga K, Hoson T, Kamisaka S and Numata H (1999) Changes in mechanical properties of the cuticle and lipid accumulation in relation to adult diapause in the bean bug, Riptortus clavatus. J. Insect Physiol. 45: 241-247. doi:10.1016/S0022-1910(98)00119-X