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Title: EVALUATION OF PEANUT BREEDING LINES WITH RESISTANCE TO THE PEANUT ROOT-KNOTNEMATODE.

Author
item Holbrook, Carl - Corley
item NOE, J - UNIVERSITY OF GEORGIA
item GORBET, D - UNIVERSITY OF FLORIDA
item Stephenson, Michael

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/21/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: The peanut root-knot nematode is a serious pest to the U.S. peanut crop. No resistant peanut varieties are available, however, a breeding line has been observed to have yield that is less sensitive to this nematode. The objectives of this study were to evaluate the sensitivity of this, and related breeding lines, to determine if these responses are due to tolerance, or resistance (i.e. a reduction in nematode reproduction). Fiel and greenhouse tests were conducted. Three breeding lines yielded similar to a check variety when grown in fields with no nematodes, and significantly higher than the check variety when grown in fields infested with nematodes. These genotypes also supported less nematode reproduction in greenhouse trials indicating that these genotypes have a moderate level of resistance.

Technical Abstract: The peanut root-knot nematode (Meloidogyne arenaria) causes significant economic losses throughout the peanut production areas of the southern United States. No resistant peanut cultivars are available, however, a breeding line (UF81206) has been observed to be less sensitive to M. arenaria than commercial cultivars. The objectives of this study were to evaluate the sensitivity to M. arenaria of UF81206 and related breeding lines, and to determine if these responses are due to tolerance or resistance. The yield of 10 peanut genotypes was evaluated for 2 years in a field with high nematode population densities and in a field with no nematodes. Two greenhouse tests were conducted to measure nematode reproduction. The breeding lines UF81206-Q4, UF81206, and UF93111 yielded similar to Florunner when grown in fields with high nematode population densities. These genotypes also supported less nematode reproduction in greenhouse trials indicating that these genotypes have a moderate level of resistance. PI203396 is in the pedigree of these breeding lines, and also exhibited a moderate level of resistance in a greenhouse trial.