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Published on: July 23, 2014
Plastid-localized ZmENR1/ZmHAD1 complex ensures maize pollen and anther development through regulating lipid and ROS
Shaowei Zhang1,2, Xueli An1,2,3, Yilin Jiang1,2
1Research Institute of Biology and Agriculture, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
A key maize gene, ZmENR1, is crucial for male fertility by regulating de novo fatty acid biosynthesis in plastids. This pathway is essential for anther cuticle and pollen exine formation, impacting plant reproduction.
Area of Science:
- Plant reproductive biology
- Molecular genetics
- Lipid metabolism
Background:
- Lipid metabolism is vital for plant male reproduction.
- Genic male sterility (GMS) often involves lipid-related genes in the anther tapetum.
- The role of de novo fatty acid biosynthesis in plastids for GMS is poorly understood.
Purpose of the Study:
- Identify novel GMS genes involved in plastidial de novo fatty acid biosynthesis.
- Elucidate the function of ZmENR1 in maize male fertility.
- Investigate the regulatory network controlling anther development and pollen formation.
Main Methods:
- Genetic mapping to clone the ZmENR1 gene.
- Biochemical assays to study protein interactions (ZmENR1 and ZmHAD1).
- Gene expression analysis to understand regulatory pathways (ZmMS1 feedback loop).
Main Results:
- Identified maize mutant enr1 with defects in tapetal development, anther cuticle, and pollen exine.
- Cloned ZmENR1, encoding a plastid-localized enoyl-acyl carrier protein (ACP) reductase essential for male fertility.
- ZmENR1 interacts with ZmHAD1 to boost de novo fatty acid synthesis.
- Discovered a ZmMS1-mediated feedback loop regulating the ZmENR1/ZmHAD1 complex.
- ZmENR1 homologs in rice and Arabidopsis also impact male fertility, indicating conserved function.
Conclusions:
- ZmENR1 is a critical GMS gene regulating de novo fatty acid biosynthesis in the anther tapetal plastids.
- The ZmENR1/ZmHAD1 pathway, under ZmMS1 control, is essential for anther cuticle and pollen exine formation.
- This pathway represents a conserved mechanism for male reproduction in flowering plants.
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