Genetic improvement (遗传改良) of plant architecture (株型) is one of the strategies for increasing the yield potential of rice (Oryza sativa). Although great progress has been made in the understanding of plant architecture regulation, the precise (精确的) mechanism is still an urgent need to be revealed. Here, we report that over-expression of OsMIR396d in rice results in semi-dwarf and increased leaf angle (叶倾角), a typical phenotype of BR enhanced mutant. OsmiR396d is involved in the interaction network of BR and GA signal. In OsMIR396d over-expression plants, BR signaling was enhanced. In contrast, both the signaling and biosynthesis of GA were impaired (受损的). BRASSINAZOLE-RESISTANT1 (OsBZR1), a core transcription activator of BR signaling, directly promoted the accumulation of OsmiR396d which controlled BR response and GA biosynthesis by regulating the expression of different target genes respectively. GROWTH REGULATING FACTOR 6 (OsGRF6), one of OsmiR396d targets, participated in GA biosynthesis and signal transduction, but was not directly involved in BR signaling. This study provides a new insight into the understanding of interaction between BR and GA from multiple levels on controlling plant architecture.

研究方向：发育生物学。主要关注植物干细胞分化的调控。

First published data: 27 November, 2017