Evaluation of F2 Hybrids Between Nematode Resistant Germplasm and Cultivars

M. Robinson, J. Jenkins, and J. McCarty, Jr.


 
ABSTRACT

Forty-five F2 hybrids were produced from nine male parents crossed to each of five cotton (Gossypium hirsutum L.) cultivars. The male parents were Root-knot nematode (Meloidogyne incognita race 3 (Koifoid and White) Chitwood) resistant germplasm lines (M240, M315, M155, M120, M92, M331, M725, M272, M249) and the cultivars were DES 119, Deltapine 50, Coker 315, Stoneville 453, and LA 887. The hybrids were evaluated in 1992 for yield and fiber traits. Also, some of the hybrids were screened in the greenhouse for Root-knot nematode resistance. The F2 populations were divided into four classes: resistant, moderately resistant, moderately susceptible, and susceptible. The hybrids evaluated in the greenhouse all showed a higher level of nematode resistance than their susceptible cultivar parent. Most of the plants in each hybrid population ranked in the moderately resistant class except the hybrid of LA887 x M240, which ranked in the resistant class. Most hybrids did not exceed their cultivar parent in yield or fiber properties; however, some of the F2 hybrids were equal to the cultivar parent.



Reprinted from 1995 Proceedings Beltwide Cotton Conference pg. 536
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998