Molecular Marker-assisted Selection of Maize Variety'Weiyu618'with Resistance to Southern Corn Rust
In order to cultivate a new maize variety with high yield,stable yield,and excellent comprehensive re-sistance,this study used materials carrying the main resistance gene of southern corn rust as parents,and combined haploid breeding with molecular marker-assisted selection technology to cultivate a new maize variety'Weiyu-618'.Based on the summary data of the regional trials(2016 and 2017)and production trials(2017)of Huang-huai-hai summer maize region,the high yield,stability,and adaptability of'Weiyu618'was analyzed by Shukla sta-bility analysis method,high stability coefficient(HSC)method and fitness.The results showed that the average yield of'Weiyu618'in the two-year regional trial was 10 599.98 kg/hm2,which increased by 9.60％compared to the control'Zhengdan 958',ranking first in the same group and demonstrating good fertility.The Shukla coefficient of variation were 5.50％and 7.85％in the two-year regional trial,respectively,which were at a lower level in the same group.The HSC reached 89.64％and 85.85％respectively,ranking first among the tested varieties in the same group.The fitness was 47.06％％and 58.33％respectively,both better than the control'Zhengdan 958'.These results indicate that'Weiyu618'has outstanding adaptability to high and stable yield.Correlation analysis shows that there is a highly significant and significant correlation between yield and grain weight per ear and 100-kernel weight in'Weiyu618'.Therefore,it is necessary to increase the grain weight per ear in production to maximize its yield potential.
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