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Haploid induction by a maize cenh3 null mutant.
Na Wang1, Jonathan I Gent1, R Kelly Dawe2,3
1Department of Plant Biology, University of Georgia, Athens, GA 30602, USA.
Science Advances
|February 1, 2021
Summary
Researchers developed a simplified method for producing haploid plants in maize using a centromeric histone H3 (CENH3) null mutation. This breakthrough facilitates the creation of new plant varieties by enabling efficient genome elimination.
Area of Science:
- Plant genetics
- Epigenetics
- Crop science
Background:
- Haploid plant production is crucial for developing new varieties.
- Existing methods using centromeric histone H3 (CENH3) variations are ineffective in crops like maize.
- A simplified approach is needed for efficient haploid induction in agriculture.
Purpose of the Study:
- To develop a simplified and effective method for haploid production in maize.
- To investigate the role of CENH3 in genome elimination for haploid induction.
- To create a versatile CENH3-based haploid inducer for crop improvement.
Main Methods:
- Crossing maize lines heterozygous for a cenh3 null mutation with wild-type plants.
- Analyzing genome elimination based on the cenh3 genotype of the gametophyte.
- Evaluating the efficiency and versatility of the cenh3 haploid inducer.
Main Results:
- Successful production of haploid maize progeny through a simplified crossing strategy.
- Genome elimination was directly linked to the cenh3 genotype in gametophytes.
- CENH3 dilution during postmeiotic divisions causes centromere failure.
Conclusions:
- A simplified CENH3-based method effectively induces haploids in maize.
- This method offers a versatile tool for creating new plant varieties and accelerating crop breeding.
- The findings provide insights into the essential role of CENH3 in centromere function and genome stability.
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