| Abstrakt: |
Inheritance of earliness of crop maturity and Verticillium wilt (Verticillium dahliaeKleb.) tolerance and the relationship between the two characters, was investigated using seven strains of cotton (Gossypium hirsutumL.). 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. |
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