Root-Knot Nematode Resistance of F2 Cotton Hybrids from Crosses of Resistant Germplasm and Commercial Cultivars
- Michael Robinson,
- Johnie N. Jenkins and
- Jack C. McCarty
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.
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