[No authors listed]
KEY can alter the fertility of bin2-1 plants and depends on the expression of SHY2. Brassinosteroids (BRs) play important roles in plant growth and developmental processes. By systematically evaluating the phenotypes of BR biosynthesis and BR signaling mutants, researchers have reported that BRs positively regulate floral development. In this study, we found that brassinosteroid-insensitive 2 (bin2-1) and short-hypocotyl 2 (shy2-2) mutants exhibited significantly reduced fertility. These mutants had short inflorescences, decreased floral organ length (short petals, stamens, carpels, and stigmas), and short siliques. Exogenous auxin applications could partially rescue the shortened length of the floral organs and siliques of the bin2-1 mutants. Additional experiments revealed that a lack of SHY2 activity increased the fertility of the bin2-1 mutants. A search for downstream affected genes revealed that auxin influences the expression of ARFs and PINs in the bin2-1 mutants, suggesting that auxin plays a major role in the regulation of bin2-1 plant fertility. Thus, BIN2 plays a role in fertility by affecting auxin levels, mainly by altering the expression of SHY2.
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