ZmGRAS46 negatively regulates flowering time in maize

Area of Science:

• Plant Molecular Biology
• Crop Genetics
• Agricultural Science

Background:

• Flowering time is a critical trait impacting maize (Zea mays L.) cultivation area.
• Gibberellin (GA) signaling pathway is a known regulator of plant flowering time.
• ZmGRAS46 was identified as a significantly down-regulated gene in early flowering maize mutants.

Purpose of the Study:

• To investigate the function of the ZmGRAS46 gene in regulating maize flowering time.
• To explore the molecular mechanism of ZmGRAS46 in response to gibberellin (GA).

Main Methods:

• Transcriptomic sequencing of early flowering maize mutants.
• Analysis of ZmGRAS46 gene expression patterns in response to GA3 treatment.
• Agrobacterium-mediated genetic transformation for gene overexpression and editing in maize.

Main Results:

• ZmGRAS46 exhibits highest expression in maize stems and is down-regulated by GA3 treatment.
• Overexpression of ZmGRAS46 significantly delays maize flowering time.
• Gene editing of ZmGRAS46 leads to earlier maize flowering and increased 100-grain weight.

Conclusions:

• ZmGRAS46 plays a crucial role in the regulation of maize flowering time.
• ZmGRAS46 acts as a negative regulator of flowering, potentially interacting with the GA signaling pathway.
• ZmGRAS46 is a potential target for genetic engineering to improve maize flowering time and yield.