Genetics and Mechanism of Resistance to Meloidogyne arenaria in Peanut Germplasm

Choi, K. and Burow, M.D. and Church, G. and Burow, G. and et al, . (1999) Genetics and Mechanism of Resistance to Meloidogyne arenaria in Peanut Germplasm. Journal of Nematology, 31 (3). pp. 283-290.

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Abstract

Segregation of resistance to Meloidogyne arenaria in six BC₅F₂ peanut breeding populations was examined in greenhouse tests. Chi-square analysis indicated that segregation of resistance was consistent with resistance being conditioned by a single gene in three breeding populations (TP259-3, TP262-3, and TP271-2), whereas two resistance genes may be present in the breeding populations TP259-2, TP263-2, and TP268-3. Nematode development in clonally propagated lines of resistant individuals of TP262-3 and TP263-2 was compared to that of the susceptible cultivar Florunner. Juvenile nematodes readily penetrated roots of all peanut genotypes, but rate of development was slower (P = 0.05) in the resistant genotypes than in Florunner. Host cell necrosis indicative of a hypersensitive response was not consistently observed in resistant genotypes of either population. Three RFLP loci linked to resistance at distances of 4.2 to 11.0 centiMorgans were identified. Resistant and susceptible alleles for RFLP loci R2430E and R2545E were quite distinct and are useful for identifying individuals homozygous for resistance in segregating populations

Item Type: Article
Additional Information: SNNigam Collection
Uncontrolled Keywords: Arachis hypogaea, genetics, host resistance, Meloidogyne arenaria, molecular markers, nematode, peanut, RFLP, root-knot nematode
Author Affiliation: Department of Plant Pathology and Microbiology. Texas A&M University, College Station, TX 77843-2132.
Subjects: Crop Improvement
Divisions: Groundnut
Depositing User: Mr B Krishnamurthy
Date Deposited: 03 Apr 2013 13:40
Last Modified: 03 Apr 2013 13:40
Official URL: http://journals.fcla.edu/jon/article/view/67062
URI: http://eprints.icrisat.ac.in/id/eprint/10135

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