Genetics of Resistance to Maize Stem Borer (Chilo partellus Swinhoe) in Maize
Maize stem borer, Chilo partellus (Swinhoe), is a serious pest. Knowledge of genetics of resistance is a prerequisite for breeding resistant cultivars. The study was conducted to evaluate C. partellus resistance on the basis of different parameters, viz. leaf feeding damage, deadheart incidence, stem tunneling, larval survival (20 days after infestation), larval period and larval weight. Seven maize inbreds and different generations of two crosses of LM5 were grown both in field and laboratory and observations were recorded for the above traits. Genetics of resistance was studied through generation mean analysis. F1s of both the crosses were susceptible for all the parameters except larval survival in the cross LM5×CML 67, where it was intermediate to both parents. Leaf injury grades indicated monogenic inheritance, the resistance being governed by a recessive allele. Stem tunneling, larval period, larval weight and larval survival showed quantitative inheritance with important additive and non-additive effects. Duplicate epistasis was found for almost all quantitatively inherited parameters. Monogenic nature of the mean leaf injury grades proved to be the most useful parameter for use in breeding programs. Therefore, the recessive allele conferring resistance should be transferred to all parental lines by standard backcross methods, and these lines should be used to develop resistant hybrids.
Chilo partellus Maize Genetics Resistance Stem borer
R.P. Girhotra V.K. Saxena N.S. Malhi
54, Professor Colony, Ludhiana, India Bisec-Seedtec Pvt. Ltd., 31-4A, Bharani Complex, Secunderabad, India Head, Department of Plant Breeding, Genetics and Biotechnology, PAU, Ludhiana, India
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
199-205
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）