Breeding Strategies for Improving the Quantitative Resistance of Maize (Zea Mays L.) Against European Corn Borer (Ostrinia Nubilalis Hübner) PDF Download
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Author: Ralph Kreps
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Category :
Languages : en
Pages :
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Author: Ralph Kreps
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Languages : en
Pages :
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Author: Christine Papst
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Category :
Languages : en
Pages : 0
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Author: Clark Waller Jennings
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Category :
Languages : en
Pages : 308
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Author: Bradley R. Engel
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Category :
Languages : en
Pages : 116
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Author: Thomas Magg
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Category :
Languages : en
Pages : 69
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Author: Daniel Pablo Donadio
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Category :
Languages : en
Pages : 258
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The European corn borer (ECB) significantly affects the production of maize in temperate regions. Second-generation ECB larvae tunnel into the stalks leading to reduced plant growth and grain yield. Several inbreds such as B52, DE811, and B86 have been identified as resistant to tunneling. However, selection for native resistance is difficult because the genetic mechanisms controlling the trait are unknown. Backcross (BC) lines are derived from B73/B52 and B73/DE811 populations were developed and selected for reduced tunneling by ECB. Phenotypic analysis of the BC lines was performed to assess their degree of resistance with respect to the parental lines. Genotypic analysis of the BC lines was accomplished by use of simple sequence repeat (SSR) primer pairs. This analysis included the investigation of the origin of chromosomal segments, estimation of parental contribution, construction of graphical genotypes, detection of loci associated with resistance and their comparison with quantitative trait loci (QTL) reported by other researchers. For the B73/B52 population, 19 of the 34 BC lines were as resistant as B52 and 1 BC line was as susceptible as B73. No correlation was found between stalk tunneling and either plant height or anthesis date. The proportion of B52 alleles in the genome of the BC lines was 2.9 to 5.2 times greater than expected assuming absence of selection and linkage. Nineteen loci could be associated with resistance. However, only 5 of them coincided with QTLs reported in other studies. For B73/DE811 population, 1 of the 6 BC lines was as resistant as DE811. Percentage of damage caused by ECB and anthesis were significantly correlated ( -0.74). The proportion of DE811 alleles was 2.3 to 8.8 times greater than expected under the cited assumptions.
Author: Craig Arthur Abel
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Category :
Languages : en
Pages : 358
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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: Lana M. Reid
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ISBN:
Category : Corn
Languages : en
Pages : 374
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Author: Shad Mallady
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Category : Transgenic plants
Languages : en
Pages : 44
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Author: A. R. Hallauer
Publisher:
ISBN: 9781441907677
Category : Corn
Languages : en
Pages : 680
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