AtMES1 positively regulates seed number per silique in Arabidopsis thaliana (L.) Heynh
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Abstract
According to our previous genome-wide association analysis (GWAS) and prediction of gene expression, we identified AtMES1 as a potential gene that may participate in regulating seed number per silique (SNS). We identified the loss-of-function mutants of AtMES1 and analyzed their phenotypes. AtMES1 had significantly reduced SNS and seed density compared with the wild-type control. Transcriptomic analysis revealed that multiple important genes involved in hormone-related ovule initiation and development were down-regulated, suggesting that AtMES1 positively regulated SNS by modulating hormone signals. The ectopic expression of AtMES1 by placenta-specific promoter STK led to shorter siliques but significantly increased seed density, further demonstrating that AtMES1 positively regulated ovule initiation and seed density. In conclusion, our study suggests that AtMES1 is a new positive regulator of Arabidopsis ovule initiation and SNS.
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