Author: Cengiz IktenPublisher:
ISBN:
Category :
Languages : en
Pages : 220
Book Description
European Corn Borer, Ostrinia Nubilalis (Hübner), Resistance and Stay Green Analyses in Eight Maize, Zea Mays L., Lines
Author: Cengiz IktenEuropean Corn Borer (Ostrinia Nubilalis (Hubner)) Resistance in Maize
Author: Chareinsuk RojanaridpichedPublisher:
ISBN:
Category : Corn
Languages : en
Pages : 480
Book Description
Mechanisms of Resistance to European Corn Borers, Ostrinia Nubilalis (Hubner), in Exotic Maize Lines
Author: Sue Lynn SullivanPublisher:
ISBN:
Category : Corn
Languages : en
Pages : 164
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.
The Effects of European Corn Borer [Ostrinia Nubilalis (L.) Hubner] and a Stalk Rot Pathogen Complex on Yield and Stalk Quality of Maize (Zea Mays L.) Grown Under Intensive Management
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Author: Frederick Wright SmithPublisher:
ISBN:
Category :
Languages : en
Pages : 178
Book Description
Resistance and Yield Depression by the European Corn Borer Ostrinia Nubilalis (Hubner) in Five Corn Hybrids
Author: Octavio Vargas HernandezPublisher:
ISBN:
Category : Corn
Languages : en
Pages : 126
Book Description
Some Factors Influencing Populations of the European Corn Borer, Ostrinia Nubilalis (Hubner) in the North Central States
Author: Alton N. SparksResistance of Corn to European Corn Borer, Ostrinia Nubilalis (Hubner), as Affected by the Growth Stage of the Host
Author: Romeo Salinas RarosThe European Corn Borer, Pyrausta Nubilalis Hübner
Author: Alexander Edmond CancePublisher:
ISBN:
Category : Ammonia as fertilizer
Languages : en
Pages : 428
Book Description
Some Factors Influencing Populations of the European Corn Borer, Ostrinia Nubilalis (Hubner) in the North Central States
Author: Charles Wax CaillouetPublisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 660
Book Description