Potential interaction between autophagy and auxin during maize leaf senescence.
Xue Feng1,2, Lili Liu1,2, Zhigang Li1,2
1Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China.
Journal of Experimental Botany
|March 8, 2021
Summary
Delaying leaf senescence in maize through genetic insights can boost crop yield. Researchers identified two key genes, Stg3 and Stg7, potentially interacting to control senescence timing and improve drought resilience.
Area of Science:
- Plant Science
- Genetics
- Agronomy
Background:
- Leaf senescence critically impacts crop yield; delaying this process offers a strategy for yield enhancement.
- Understanding the genetic underpinnings of leaf senescence is crucial for improving maize (Zea mays L.) productivity.
Purpose of the Study:
- To dissect the genetic basis of leaf senescence in maize by integrating population genetics and transcriptomic profiling.
- To identify novel genes and pathways regulating leaf senescence timing and its effect on yield and stress tolerance.
Main Methods:
- Utilized progenies from an elite maize hybrid and its parental lines with contrasting senescence phenotypes.
- Employed population genetics and transcriptomic profiling to identify senescence-associated loci and genes.
- Analyzed genomic variations in promoter regions and gene expression levels.
Main Results:
- Identified two novel loci, Stg3 (ZmATG18b) and Stg7 (ZmGH3.8), linked to autophagy and auxin pathways, respectively.
- Discovered four distinct allelic combinations influencing ZmATG18b and ZmGH3.8 expression.
- The Stg3Si-144/Stg7Si-144 combination delayed senescence and increased ear weight, enhancing drought stress tolerance.
Conclusions:
- A novel interaction between autophagy and auxin pathways modulates maize leaf senescence timing.
- Specific allelic combinations of Stg3 and Stg7 offer potential for developing maize varieties with improved yield and stress resilience.
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