EMBRYO SAC DEVELOPMENT 1 affects seed setting rate in rice by controlling embryo sac development

Area of Science:

• Plant Biology
• Genetics
• Agricultural Science

Background:

• Seed setting rate is a key determinant of rice yield.
• The molecular mechanisms regulating grain formation require further elucidation.

Purpose of the Study:

• To investigate the function of the OVATE family protein, Embryo Sac Development 1 (ESD1), in regulating rice seed setting rate.
• To understand the role of ESD1 in embryo sac development and its impact on rice yield.

Main Methods:

• Utilized CRISPR/Cas9 gene editing technology to generate loss-of-function mutants of ESD1 in rice (Oryza sativa).
• Analyzed mutant phenotypes, focusing on reproductive organs, embryo sac development, and gene expression.
• Examined ovule and pistil development, as well as megaspore mitosis and egg cell differentiation.

Main Results:

• esd1 mutants exhibited significantly reduced seed setting rates.
• Abnormal pistil development and egg cell degradation during megaspore mitosis were observed in esd1 mutants.
• The transcriptional level of O. sativa anaphase-promoting complex 6 was reduced in esd1 mutants, indicating impaired embryo sac development.

Conclusions:

• ESD1 positively regulates seed setting rate in rice by controlling embryo sac development.
• ESD1 plays a critical role in ensuring proper egg cell differentiation and subsequent fertilization.
• Findings provide insights for improving rice yield through genetic manipulation of ESD1.