EMS Mutagenesis of Maize Pollen

Area of Science:

• Plant genetics
• Molecular biology
• Agricultural science

Background:

• Effective mutagenesis is crucial for linking plant traits to specific genes.
• While site-directed mutagenesis and genetics resources in maize enable targeted gene analysis, they risk confirmation bias.
• Random mutagenesis screens are vital for discovering novel loci and gene interactions.

Purpose of the Study:

• To provide an updated protocol for ethyl methanesulfonate (EMS) mutagenesis of maize pollen.
• To discuss considerations for genetic screens using EMS-induced mutations in maize.
• To highlight the utility of chemical mutagenesis for high mutation rates and diverse screen designs.

Main Methods:

• Updated protocol for ethyl methanesulfonate (EMS) mutagenesis of maize pollen using paraffin or mineral oil.
• Detailed considerations for managing nonconcordant endosperm and embryo genotypes in M1 plants.
• Strategies for analyzing sectored M1 plants in genetic screens.

Main Results:

• EMS mutagenesis induces high mutation rates in mature maize pollen.
• Mutagenesis in pollen leads to nonconcordant genotypes between endosperm and embryo.
• M1 plants exhibit genetic sectoring, requiring specific screening considerations.

Conclusions:

• Ethyl methanesulfonate (EMS) mutagenesis is a powerful tool for maize genetic research, offering high mutation rates.
• The protocol addresses challenges like nonconcordant genotypes and plant sectoring, crucial for effective genetic screens.
• This method facilitates the discovery of new genes and interactions, complementing targeted approaches in plant genetics.