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Plants and crops are widely suffered by shade stress in the natural communities or in the agricultural fields. The three main phytohormones auxin, gibberellins (GAs) and brassinosteroids (BRs) were found essential in shade avoidance in Arabidopsis. However, their relationship have been seldom reported in plant shade avoidance control. Here, we report our investigation of the crosstalk of auxin, GAs and BRs in shade-induced hypocotyl elongation of soybean. Exogenous feeding of indol-3-acetic acid (IAA), GA3 or 24-epibrassinolide (EBL) distinctly promoted hypocotyl elongation in the white light, while the potent biosynthesis inhibitors of GA3, IAA, BRs severely diminished shade-induced hypocotyl elongation. Synergistic treatment of their biosynthesis inhibitors showed that GA3 fully, while EBL slightly, restored the hypocotyl elongation that was efficiently repressed by IAA biosynthesis inhibitor, GA3 and IAA dramatically suppressed the hypocotyl growth inhibition by BR biosynthesis inhibitor in the shade, whereas both IAA and EBL feeding cannot suppress the elongation inhibition by GA biosynthesis inhibitor. Further analyses revealed that shade remarkably upregulated expression of key genes of IAA, GA and BR biosynthesis in the soybean hypocotyls, and GA biosynthesis genes were effectively blocked by IAA, GA and BR biosynthesis inhibitors in the shade. Taken together, these results suggest that GAs modulate shade-induced hypocotyl elongation downstream of mutual promotion of auxin and BRs in soybean.
This article was published in the following journal.
Name: Plant physiology and biochemistry : PPB
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Oil from soybean or soybean plant.
An SHC-signaling adaptor protein that transduces PHOSPHOTYROSINE-dependent signals downstream of RECEPTOR PROTEIN-TYROSINE KINASES and non-receptor tyrosine kinases. It is required for TGF-BETA-induced CELL MIGRATION; NEOLPASM INVASION; and METASTASIS of BREAST NEOPLASMS; its SH2 DOMAIN is essential for tumor survival. It also functions in signaling downstream of ANGIOPOIETIN RECEPTOR TIE-2, regulating the migration of ENDOTHELIAL CELLS; and PHYSIOLOGIC NEOVASCULARIZATION.
Factors that utilize energy from the hydrolysis of GTP to GDP for peptide chain elongation. EC 3.6.1.-.
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