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Root-Knot Nematode Resistance of F₂ Cotton Hybrids from Crosses of Resistant Germplasm and Commercial Cultivars

Dep. of Plant and Soil Sciences, Mississippi State Univ., Box 9555, Mississippi State, MS 39762

Johnie N. Jenkins^* and Jack C. McCarty, Jr.

USDA-ARS, Crop Science Res. Lab., P.O. Box 5367, Mississippi State, MS 39762

^* Corresponding author (jjenkins{at}ra.msstate.edu).

The southern root-knot nematode (RKN), Meloidogyne incognita (Kofoid and White) Chitwood, is a major pest of cotton (Gossypium hirsutum L.). A high level of resistance has been identified in eight germplasm lines; however, these lines are not as productive in yield as current cultivars. This study was conducted to determine the possibility of using F₂ populations from crosses of these RKN resistant germplasm lines with five current cultivars as a means of combining RKN resistance with high yield potential. Two F₂ populations were evaluated for their level of nematode resistance. Resistance in these F₂ populations was greater than the cuitivar parents but less than the RKN resistant germplasm parents. The resistance level of the F₂ population, however, was nearer the germplasm parenthan the cultivar parent, indicating that the F₂ hybrids possess a useful level of resistance. Yield and fiber properties among the F₂ hybrids indicated that by careful selection of parents, F₂ populations that were equal in yield and fiber quality to the best of the cultivar parents could be produced. Results of this study indicate that F₂ populations may provide a rapid way to combine high levels of RKN resistance with the higher yield and superior fiber properties of current cultivars.

Received for publication June 15, 1996.