Rice LEAFY COTYLEDON1 Hinders Embryo Greening During the Seed Development

Area of Science:

• Plant Biology
• Molecular Biology
• Genetics

Background:

• LEAFY COTYLEDON1 (LEC1) is a key regulator of seed development in Arabidopsis.
• Its function in monocots, like rice, remains largely unknown.

Purpose of the Study:

• To investigate the role of OsLEC1 in rice (Oryza sativa) seed development.
• To understand OsLEC1's regulatory mechanisms, particularly its influence on photosynthesis and embryo development.

Main Methods:

• CRISPR/Cas9 gene editing to create Oslec1 mutants in rice.
• Transcriptome analysis to identify gene expression changes in mutants.
• Genome-wide identification of OsLEC1-binding sites using ChIP-seq.

Main Results:

• Oslec1 mutant seeds exhibited loss of desiccation tolerance and premature embryo greening.
• OsLEC1 mutation altered hormonal pathways (ABA, GA) and stress responses during seed maturation.
• OsLEC1 directly binds to genes involved in photosynthesis, photomorphogenesis, and hormone pathways.
• A regulatory network highlights OsLEC1's role in connecting photosynthesis with ABA/GA signaling.

Conclusions:

• OsLEC1 is essential for rice seed maturation and prevents precocious germination (embryo greening).
• OsLEC1 integrates photosynthesis regulation with hormonal signaling pathways during seed development.
• This study elucidates OsLEC1's function in monocot seed development and its control over photosynthesis.