Author: Christine PapstPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Resistance Breeding in Maize (Zea Mays L.) Against the European Corn Borer (Ostrinia Nubilalis Hübner) and the Use of DNA-markers for Marker-assisted Selection
Author: Christine PapstBreeding Strategies for Improving the Quantitative Resistance of Maize (Zea Mays L.) Against European Corn Borer (Ostrinia Nubilalis Hübner)
Author: Ralph KrepsGenetics of Resistance in Maize (Zea Mays L.) to Second-brood European Corn Borer (Ostrinia Nubilalis Hübner)
Author: Clark Waller JenningsPublisher:
ISBN:
Category :
Languages : en
Pages : 308
Book Description
Quantitative Trait Loci for First- and Second-generation European Corn Borer Resistance in Maize
Author: Chaba JampatongPublisher:
ISBN:
Category : Corn
Languages : en
Pages : 160
Book Description
European corn borer (ECB), Ostrinia nubilalis Hübner, family Crambidae, order Lepidoptera, is a serious insect pest of maize (Zea mays L.) in the United States. Losses to farmers resulting from ECB damage and control costs exceed $1 billion each year. An understanding of the genetic basis for ECB resistance should increase the efficiency of breeding for insect resistant varieties. The objectives of this study were to determine the number, genomic positions, and genetic effects of quantitative trait loci (QTL) conferring resistance to the first- and second-generation of European corn borer (1ECB, 2ECB), and to observe QTL × environment interactions. The study included 244 F 2-3 families derived from the cross of B73 (susceptible) × Mo47 (resistant). Evaluating resistance against 1ECB, plants were manually infested at the eight- to ten-leaf stage of plant development. Leaf feeding damage was assessed three weeks after infestation with a visual rating scale. Evaluation for resistance to 2ECB involved manually infesting at anthesis stage of plant development. Approximately seven weeks later, stalks were split lengthwise and number and the length of tunnels visually estimated in inches. Plant height and rind penetrometer resistance were measured two weeks after flowering. Quantitative trait loci analyses for individual environments and combined across three environments were performed by composite interval mapping using QTL Cartographer. For 1ECB leaf feeding, nine QTLs were identified on chromosomes 1(three QTLs), 2, 4 (two QTLs), 5, 6, and 8. Seven QTLs for resistance to 2ECB tunnel length were found on chromosomes 2, 5 (two QTLS), 6 (two QTLs), 8, and 9. Twelve QTLs for resistance to 2ECB tunnel length adjusted for plant height were identified on chromosomes 1 (two QTLs), 2, 3 (two QTLs), 5, 6 (three QTLs), 8, 9, and 10. In addition, QTLs were identified for tunnel number (16 QTLS), plant height (11 QTLs) and rind penetrometer resistance (nine QTLs). In this experiment, a total of 47 QTLs for all traits were mapped in three individual environments and combined over environments. Nine (19%) QTLs were expressed in all three environments and combined, 17 (36%) were expressed in two environments and combined, and 21 (45%) were expressed only in single environment and combined. Inconsistency of QTLs across environments suggested need for breeders awareness when selecting markers linked to QTLs for marker-assisted selection (MAS). Further study on consistency of QTLs across populations is needed before applied breeding programs can fully utilized QTL information.
Evaluation of Peruvian Maize (Zea Mays L.) for Resistance to European Corn Borer [(Ostrinia Nubilalis Hübner) Lepidoptera:Pyralidae] Leaf Feeding and Ovipositional Preference
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Author: Craig Arthur AbelInsect Resistant Maize
Author: Publisher: CIMMYT
ISBN: 9789686923797
Category : Corn
Languages : en
Pages : 316
Book Description
Mechanisms and bases of resistance; The genetics of resistance; Biotechnological manipulation of resistance; Advances in techniques, rearing, rating bioassays, mechanism detection; Resistance verification and utilization; Country reports.
Resistance of Maize (Zea Mays L.) Against the European Corn Borer (Ostrinia Nubilalis Hb.) and Its Association with Mycotoxins Produced by Fusarium Spp
Author: Thomas MaggEvaluation of Maize (Zea Mays L.) Inbreds for Resistance to the European Corn Borer (Ostrinia Nubilalis Hb.) and the Potential Role of Lignin as a Resistance Mechanism
Author: Bradley R. EngelIntrogressing a New Source of Host-plant Resistance to European Corn Borer Into Two Elite Maize Inbred Lines
Author: Craig Arthur AbelPublisher:
ISBN:
Category :
Languages : en
Pages : 358
Book Description
Eleven accessions of Peruvian maize were evaluated for mechanisms of resistance to leaf feeding by European corn borer, Ostrinia nubilalis (Hubner). Antibiosis was identified as one mechanism of resistance that operates at a level equivalent to Cl31A which is a maize inbred line containing high levels of 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), thus having strong antixenotic and antibiotic properties towards leaf feeding by European corn borer. Antixenosis may be another mechanism of resistance operating in the Peruvian maize but at a level lower than Cl31A. The 11 Peruvian maize accessions were used as donor parents in a backcross plant breeding program designed to introgress the European corn borer resistance trait into two elite U.S. Corn Belt adapted inbred lines. Resistance to European corn borer leaf feeding and sheath and collar feeding was recovered in the Fl indicating dominant genetic control.
Author: