Analysis of Genetic Potentiality of Forty Maize Single Cross Hybrids and Diversity among Their Parental Lines
Development and utilization of single cross hybrids has been the major strategy for maize improvement in India only during the past decade. Also, the relationship between genetic diversity of the inbred lines and the heterotic potentiality of the resulting crosses needs to be assessed, to elicit information of practical importance. To assess the productive potentiality, forty experimental hybrids, involving thirteen parental lines (line×tester design) were evaluated in two locations. For yield and its components, SCA variances were more important than GCA variances implying suitability of the inbred lines used in the study for hybrid development. SCA×location variance was highly significant for most of the traits, indicating the importance of location specific hybrids. In addition, two of the hybrids were found to be better performers in both the locations, thus implying the need to further evaluate them in different locations. For extensive characterization of the parental lines, a polymorphism survey using morphological as well as molecular (SSR) markers was undertaken. Among the 28 morphological markers used, very few unique alleles were identified. However, forty-two SSR loci revealed 56 unique alleles and hence were better than morphological markers for identification and differentiation of the inbreds. Large diversity of the inbred lines relative to the testers was illustrated, thus justifying the logic of the design and experimental crosses generated. Systematic analysis and heterotic grouping among the components of each source population is suggested.
Maize Single cross hybrid Combining ability Heterosis Genetic diversity
Basavaraj Holeyachi Raveendra Gadag
Division of Genetics, IARI, New Delhi-110012, India
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
76-78
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）