Genic male sterility increases rice drought tolerance

Area of Science:

• Plant Science
• Molecular Biology
• Genetics

Background:

• Plant fertility and stress resistance are often inversely correlated.
• Abiotic stress can compromise rice fertility during the booting stage.
• The molecular mechanisms linking fertility and stress resistance are not well understood.

Purpose of the Study:

• To identify molecular factors regulating both drought stress response and thermosensitive genic male sterility (TGMS) in rice.
• To elucidate the role of the transcription factor OsAlfin like 5 (OsAL5) in these processes.

Main Methods:

• Identification and characterization of the OsAlfin like 5 gene.
• Analysis of OsAL5 overexpression plants (OE-OsAL5) under varying temperatures and drought stress.
• Gene expression analysis and in vivo binding assays to confirm OsAL5 targets.

Main Results:

• OsAlfin like 5 regulates OsTMS5, conferring thermosensitive genic male sterility in OE-OsAL5 plants (fertile at 23°C, sterile at 28°C).
• OE-OsAL5 lines exhibited significantly higher survival rates under drought stress compared to wild-type (WT).
• OsAL5 directly binds to the 'GTGGAG' element, regulating OsTMS5 and downstream drought-responsive genes.

Conclusions:

• OsAlfin like 5 acts as a crucial molecular link between drought stress response and thermosensitive genic male sterility in rice.
• OsAL5 presents a potential target for breeding elite TGMS rice varieties with enhanced drought tolerance.