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Brassinosteroids (BRs) play key roles in plant growth and development, and regulate various agricultural traits. Enhanced BR signaling leads to increased seed number and yield in Arabidopsis  bzr1-1D  (AtBZR1 P234L , gain-of-function mutant of the important transcription factor in BR signaling/effects). BR signal transduction pathway is well elucidated in Arabidopsis but less known in other species. Soybean is an important dicot crop producing edible oil and protein. Phylogenetic analysis reveals  AtBZR1 -like genes are highly conserved in angiosperm and there are 4 orthologues in soybean ( GmBZL1-4 ). We here report the functional characterization of  GmBZL2  (relatively highly expresses in flowers). The P234 site in AtBZR1 is conserved in GmBZL2 (P216) and mutation of GmBZL2 P216L  leads to GmBZL2 accumulation. GmBZL2 P216L  ( GmBZL2* ) in Arabidopsis results in enhanced BR signaling; including increased seed number per silique.  GmBZL2*  partially rescued the defects of  bri1-5 , further demonstrating the conserved function of GmBZL2 with AtBZR1. BR treatment promotes the accumulation, nuclear localization and dephosphorylation/phosphorylation ratio of GmBZL2, revealing that GmBZL2 activity is regulated conservatively by BR signaling. Our studies not only indicate the conserved regulatory mechanism of GmBZL2 and BR signaling pathway in soybean, but also suggest the potential application of GmBZL2 in soybean seed yield.

Functional characterization of GmBZL2 (AtBZR1 like gene) reveals the conserved BR signaling regulation in Glycine max