Inheritance of Resistance to Cotton Leaf Crumple Virus

F. Douglas Wilson and Judith K. Brown


 
ABSTRACT

Cotton leaf crumple disease (CLC) of cotton, Gossypium spp., is caused by the CLC virus (CLCV), which is transmitted by the sweetpotato whitefly, Bemisia tabaci (Gennadius). Symptoms include distorted leaves and flowers, mosaic, and stunting of growth, which results in yield loss. Objectives of this study were 1) to determine the response of cotton germplasm to CLCV; 2) to study the inheritance of CLCV resistance. Cotton plants were scored for CLC symptoms following natural infestations of whitefly or following deliberate exposure of seedlings to infected insects. The 47 lines of G. hirsutum scored in 1986 and 1987, the 17 lines scored in 1988, and the 12 lines of G. barbadense scored in 1988 varied from susceptible to highly resistant to CLCV. The susceptible 'Deltapine 90' was crossed to the highly resistant 'Cedix'. Seedlings of parents, F1, F2, and backcross generations were exposed to infected whiteflies in the greenhouse, transplanted to the field, and scored later in the season. Segregation ratios indicated that susceptibility is recessive to resistance and is conditioned by duplicate factors.



Reprinted from Proceedings: 1989 Beltwide Cotton Research Conferences pg. 128
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998