Loose Plant Architecture1 (LPA1) determines lamina joint bending by suppressing auxin signalling that interacts with C-22-hydroxylated and 6-deoxo brassinosteroids in rice

Journal of Experimental Botany
Jing Miao LiuChang-Deok Han

Abstract

Lamina inclination is a key agronomical character that determines plant architecture and is sensitive to auxin and brassinosteroids (BRs). Loose Plant Architecture1 (LPA1) in rice (Oryza sativa) and its Arabidopsis homologues (SGR5/AtIDD15) have been reported to control plant architecture and auxin homeostasis. This study explores the role of LPA1 in determining lamina inclination in rice. LPA1 acts as a positive regulator to suppress lamina bending. Genetic and biochemical data indicate that LPA1 suppresses the auxin signalling that interacts with C-22-hydroxylated and 6-deoxo BRs, which regulates lamina inclination independently of OsBRI1. Mutant lpa1 plants are hypersensitive to indole-3-acetic acid (IAA) during the lamina inclination response, which is suppressed by the brassinazole (Brz) inhibitor of C-22 hydroxylase involved in BR synthesis. A strong synergic effect is detected between lpa1 and d2 (the defective mutant for catalysis of C-23-hydroxylated BRs) during IAA-mediated lamina inclination. No significant interaction between LPA1 and OsBRI1 was identified. The lpa1 mutant is sensitive to C-22-hydroxylated and 6-deoxo BRs in the d61-1 (rice BRI1 mutant) background. We present evidence verifying that two independent ...Continue Reading

References

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Dec 14, 2002·Plant Physiology·Dong-Hoon JeongGynheung An
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Citations

Nov 11, 2017·Journal of Experimental Botany·Maria Betsabe Mantilla-Perez, Maria G Salas Fernandez
Oct 29, 2018·The New Phytologist·Dhinesh Kumar, Elizabeth A Kellogg
Sep 25, 2018·Journal of Integrative Plant Biology·Weiyang ZhangJianhua Zhang
May 12, 2019·International Journal of Molecular Sciences·Manu KumarHyun Uk Kim
Jun 3, 2017·Journal of Integrative Plant Biology·Peng HuangMiyako Ueguchi-Tanaka
Oct 19, 2019·International Journal of Molecular Sciences·Qian-Feng LiQiao-Quan Liu
Oct 24, 2017·Trends in Plant Science·Carla P CoelhoThomas P Brutnell
Apr 19, 2021·Plant, Cell & Environment·Jing XuGuang-Heng Zhang

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