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Published in Crop Sci 21:319-321 (1981)
© 1981 Crop Science Society of America
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Breeding for Early Maturity and Verticillium Wilt Tolerance in Upland Cotton1

Pedro Cano-Rios and Dick D. Davis2

Inheritance of earliness of crop maturity and Verticillium wilt (Verticillium dahliae Kleb.) tolerance and the relationship between the two characters, was investigated using seven strains of cotton (Gossypium hitsutum L.). Maturity rank was consistent over the two locations used, Las Cruces, N.M., USA, and Matamoros, Coahuila, Mexico.

Only general combining ability effects (GCA) were significant for either character. The strains Nectariless and Stahmannh ad the largest GCA effects for crop earliness, indicating that these cottons are potentially useful sources of germplasmin earliness breeding programs. Yugoslavian and ‘Deltapine 16’ exhibited the largest GCA effects for Verticillium wilt tolerance.

Yugoslavian and Stahmann showed the largest GCA effects for lint yield, suggesting that these strains could have value in developing wilt tolerant cultivars with good fiber yields. The strong association between wilt tolerance and lint yield at Las Cruces suggested that selecting for wilt tolerance among progenies stemming from these cottons on wilt-infested soil might also increase lint yield.

Simultaneous selection for earliness of crop maturity and wilt tolerance, using Stahmannas a donoro fearliness, could be accomplished using the pedigree method of breeding.

Key Words: Short season cotton • Bloom rate • Date of first bloom • Gossypium hirsutum L. • Verticillium dahliae Kleb.

1 Journal article 732, Agric. Exp. Stn., New Mexico State Univ., Las Cruces, NM 88003.

2 Respectively former graduate assistant and professor, Dep. of Agronomy, New Mexico State Univ., Las Cruces, NM 88003.

Received for publication September 20, 1979.




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