Variation Analysis and Application Evaluation of Progeny of Maize Inbred Line Zheng 58 by EMS Chemical Mutation
Seeds are dubbed as the"chips"of agriculture,play a fundamental role in ensuring food security.Agricultural germplasm resources are also known as"seed chip",are crucial for overcoming technological barriers.Therefore,the introduction,creation and enrichment of germplasm resources are the key to overcome the"bottle-neck"technology,and artificial mutagenesis serves as an important way for innovating germplasm resources.In this study,maize inbred line Zheng 58 pollen was mutated by 0.67 mg/L EMS,and a library of 1 650 maize mutants was constructed.From the progeny of M2 and M3,mutants were screened for several agronomic traits,including growth stage,plant type,leaf type,ear type,grain type,leaf color,axial color,fertility,etc.The phenotypic variation rate was about 9.6％.Representative materials with promising breeding applications,such as Z330,Z641 and Z1433,were identified.These can be used for breeding new varieties of dwarf,low spike position,dense planting resistance and lodging resistance.New germplasm materials such as Z636,Z848 and Z930 can be used to test or improve maize spike type,kernel type,axial color,and grain color and quality characters.
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