The ZmFKF1b-ZmDi19-5 Regulatory Module Coordinates Drought Tolerance and Flowering Time in Maize

Area of Science:

• Plant Biology
• Molecular Genetics
• Agronomy

Background:

• Drought stress significantly impacts plant growth and crop yield.
• The Di19 gene family is recognized for its role in plant drought responses.
• Mechanisms linking Di19 proteins to maize developmental processes like flowering are unclear.

Purpose of the Study:

• To investigate the function of ZmDi19-5 in maize drought tolerance and flowering.
• To elucidate the interaction between ZmDi19-5 and ZmFKF1b.
• To understand how this interaction regulates drought response and flowering time.

Main Methods:

• Gene overexpression in maize.
• Analysis of drought tolerance and flowering time phenotypes.
• In vivo and in vitro protein-protein interaction assays.
• Promoter binding assays and gene expression analysis.

Main Results:

• Overexpression of ZmDi19-5 improved drought tolerance and delayed flowering in maize.
• ZmDi19-5 physically interacts with ZmFKF1b.
• ZmFKF1b overexpression led to increased drought sensitivity and accelerated flowering.
• ZmFKF1b interaction with ZmDi19-5 reduced ZmDi19-5 binding to downstream targets ZmHsf08 and ZmCOL3 promoters.

Conclusions:

• The ZmFKF1b-ZmDi19-5 module integrates drought stress responses with flowering time regulation in maize.
• This interaction provides a novel mechanism for coordinating stress tolerance and development.
• The ZmFKF1b-ZmDi19-5 pathway presents a potential target for breeding improved maize varieties.