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A Gγ protein regulates alkaline sensitivity in crops
Huili Zhang1,2, Feifei Yu1,3, Peng Xie1
1State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China.
Scientists identified a gene, Alkaline Tolerance 1 (AT1), crucial for plant survival in alkaline soils. Modifying AT1 can enhance crop resilience, boosting food production on challenging sodic lands.
Area of Science:
- Plant Biology
- Genetics
- Agricultural Science
Background:
- Crop production on alkaline salt lands is limited by poor plant alkaline tolerance.
- Limited knowledge and breeding efforts exist for enhancing plant resilience to alkalinity.
Purpose of the Study:
- To identify genetic factors controlling alkaline tolerance in crops.
- To understand the molecular mechanisms underlying plant responses to alkaline stress.
Main Methods:
- Genome-wide association study in sorghum to identify alkaline tolerance loci.
- Functional analysis of the identified gene (AT1) through gene knockout and allele analysis.
- Investigated the role of AT1 in plant physiology, including aquaporin phosphorylation and hydrogen peroxide distribution.
Main Results:
- A major locus, Alkaline Tolerance 1 (AT1), was identified and linked to alkaline-salinity sensitivity.
- A truncated at1 allele increased sensitivity, while AT1 knockout enhanced tolerance in sorghum, millet, rice, and maize.
- AT1 encodes a G protein subunit regulating aquaporin phosphorylation and hydrogen peroxide distribution, protecting against alkali-induced oxidative stress.
Conclusions:
- AT1 plays a critical role in plant alkaline tolerance by managing oxidative stress.
- Targeting AT1 through knockout or selecting nonfunctional alleles offers a strategy to improve crop yields on sodic lands.
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