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United States Department of Agriculture

Agricultural Research Service

Title: Expression of Resistance to the Southern Root-Knot Nematode, Meloidogyne Incognita, in Capsicum Chinense and C. Annuum at High Temperatures

item Thies, Judy
item Fery, Richard

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 1999
Publication Date: N/A

Technical Abstract: Expression of resistance to the southern root-knot nematode, Meloidogyne incognita(Mi), in Capsicum chinense and C. annuum was determined in growth chambers at 24, 28, and 32 degrees C. Two C. chinense germplasm lines, PA-426 (resistant) and PA-350 (susceptible), and two C. annuum cultivars, Charleston Belle (resistant) and Keystone Resistant Giant (susceptible), were used in these experiments. Root galling, numbers of eggs per g root, and Mi reproductive index increased as temperature increased for both the Mi resistant PA-426 and Charleston Belle, and the susceptible PA-350 and Keystone Resistant Giant. Overall, root gall severity and nematode reproduction were less (P<0.05) for the resistant PA-426 and Charleston Belle than for the susceptible PA-350 and Keystone Resistant Giant. However, both resistant genotypes exhibited a partial loss of resistance at the higher temperatures. Although resistance was compromised at high temperatures, cultivars possessing this resistance may be a useful component of integrated systems designed to manage soilborne pests in hot climates

Last Modified: 4/22/2015
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