Distributions Among S1Lines for European Corn Borer (Lepidoptera: Pyralidae) and Stalk Rot Resistance Ratings in Two Maize Synthetics Improved by Recurrent Selection
Authors: NYHUS, K. A.; RUS5ELL, W. A.; GUTHRlE, W. D.
Source: Journal of Economic Entomology, Volume 82, Number 1, February 1989 , pp. 239-245(7)
Publisher: Entomological Society of America
Abstract:Four cycles of recurrent selection were used to reduce leaf-feeding damage caused by first-generation European corn borer (ECB), Ostrinia nubilalis Hübner, and pith decay associated with Diplodia, Diplodia maydis (Berkeley) Saccardo, stalk rot (DSR)in two maize, Zea mays L., synthetics, BSAA and BSBB. Recurrent selection was based on the evaluation of SI progenies. For this study, 100 unselected 51lines from each of the original (CO)and improved (C4) populations of B5AA and BSBB were evaluated for ECB resistance, DSRresistance, and stalk rind puncture. The distributions of S,1 lines for the three traits and the genetic relationships among traits were evaluated to determine the effectiveness of the recurrent selection programs. The C4s of both synthetics were more resistant than the COs to ECB leaf feeding after artificial infestations, were more resistant to D5R after artificial inoculations, and possessed harder stalks. The differences between the CO and C4 means were highly significant (P < 0.01) in all instances. Reductions in genetic variation were observed in BSAA for ECB ratings and in BSBB for all three traits. The reductions in genetic variation were especially dramatic for ECB ratings, indicating that relatively few gene pairs were segregating for leaf-feeding resistance in B5AAand BSBB.Low and generally nonsignificant correlations between DSR ratings and rind puncture readings indicated that selection for both traits would be justified to improve field stalk lodging resistance.
Document Type: Research Article
Publication date: February 1, 1989
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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