AFLP marker associations with agronomic and fiber traits in cotton |
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Authors: | Jixiang Wu Johnie N. Jenkins Jack C. McCarty Ming Zhong Michael Swindle |
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Affiliation: | (1) Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762, USA;(2) Crop Science Research Laboratory, USDA-ARS, P.O. Box 5367, Mississippi State, MS 39762, USA;(3) Bayer Cotton Seed International, Leland, MS 38756, USA |
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Abstract: | DNA markers linked with major QTL contributing to traits of importance will be a useful tool for cotton (Gossypium spp.) genetics and breeding. We crossed four photoperiod-sensitive accessions of cotton, G. hirsutum L., with a cultivar, selected day-neutral plants and backcrossed four times to each of the four photoperiod-sensitive accessions, selecting day-neutral plants at each generation. The day-neutral plants from the first cross and the four backcross generations were advanced to the F6. These 20 day-neutral lines and four cultivars were grown in two environments at Mississippi State, MS and scored for seven agronomic and fiber quality traits. They were also scored for AFLP markers using a bulk sample of leaves from each of 24 lines. More than 50 AFLP markers were associated with the seven traits with fewer markers associated with fiber than agronomic traits. However, one to four markers were associated with 22–93% of the phenotypic variability of each of the seven traits. The results suggest that selected markers could be used in marker assisted selection (MAS) in crosses designed to use alleles from exotic accessions or cultivars to develop elite breeding lines for cotton improvement. |
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Keywords: | AFLP QTL Cotton Marker-assisted selection Yield traits Fiber traits |
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