Brassinosteroid control of shoot gravitropism interacts with ethylene and depends on auxin signaling components

F. Vandenbussche, P. Callebert, P. Žádníková, E. Benková, D. Van Der Straeten, American Journal of Botany 100 (2013) 215–225.

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Abstract
Premise of the study: To reach favorable conditions for photosynthesis, seedlings grow upward when deprived of light upon underground germination. To direct their growth, they use their negative gravitropic capacity. Negative gravitropism is under tight control of multiple hormones. • Methods: By counting the number of standing plants in a population or by real time monitoring of the reorientation of gravistimulated seedlings of Arabidopsis thaliana, we evaluated the negative gravitropism of ethylene or brassinosteroid (BR) treated plants. Meta-analysis of transcriptomic data on AUX / IAA genes was gathered, and subsequent mutant analysis was performed. • Key results: Ethylene and BR have opposite effects in regulating shoot gravitropism. Lack of BR enhances gravitropic reorientation in 2-d-old seedlings, whereas ethylene does not. Lack of ethylene signaling results in enhanced BR sensitivity. Ethylene and BRs regulate overlapping sets of AUX / IAA genes. BRs regulate a wider range of auxin signaling components than ethylene. • Conclusions: Upward growth in seedlings depends strongly on the internal hormonal balance. Endogenous ethylene stimulates, whereas BRs reduce negative gravitropism in a manner that depends on the function of different, yet overlapping sets of auxin signaling components.
Publishing Year
Date Published
2013-01-01
Journal Title
American Journal of Botany
Volume
100
Issue
1
Page
215 - 225
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Vandenbussche F, Callebert P, Žádníková P, Benková E, Van Der Straeten D. Brassinosteroid control of shoot gravitropism interacts with ethylene and depends on auxin signaling components. American Journal of Botany. 2013;100(1):215-225. doi:10.3732/ajb.1200264
Vandenbussche, F., Callebert, P., Žádníková, P., Benková, E., & Van Der Straeten, D. (2013). Brassinosteroid control of shoot gravitropism interacts with ethylene and depends on auxin signaling components. American Journal of Botany, 100(1), 215–225. https://doi.org/10.3732/ajb.1200264
Vandenbussche, Filip, Pieter Callebert, Petra Žádníková, Eva Benková, and Dominique Van Der Straeten. “Brassinosteroid Control of Shoot Gravitropism Interacts with Ethylene and Depends on Auxin Signaling Components.” American Journal of Botany 100, no. 1 (2013): 215–25. https://doi.org/10.3732/ajb.1200264.
F. Vandenbussche, P. Callebert, P. Žádníková, E. Benková, and D. Van Der Straeten, “Brassinosteroid control of shoot gravitropism interacts with ethylene and depends on auxin signaling components,” American Journal of Botany, vol. 100, no. 1, pp. 215–225, 2013.
Vandenbussche F, Callebert P, Žádníková P, Benková E, Van Der Straeten D. 2013. Brassinosteroid control of shoot gravitropism interacts with ethylene and depends on auxin signaling components. American Journal of Botany. 100(1), 215–225.
Vandenbussche, Filip, et al. “Brassinosteroid Control of Shoot Gravitropism Interacts with Ethylene and Depends on Auxin Signaling Components.” American Journal of Botany, vol. 100, no. 1, Botanical Society of America, 2013, pp. 215–25, doi:10.3732/ajb.1200264.

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