Abstract
Cotton (Gossypium spp.) yield is directly determined by mature bolls that developed from squares and flowers. The first four to six weeks of flowering accounts for the majority of lint yield in upland cotton (G. hirsutum L.) for most cultivated areas of the southern USA cotton belt. In this study, we evaluated 13 cotton chromosome substitution lines (CS-B) and their chromosome specific-F2 hybrids, TM-1, 3–79, and six cultivars for the number of flowers produced during the first four weeks of flowering. Results showed that CS-B05sh produced more flowers than TM-1 and 3–79 from 10 July to 5 August. The results suggest that when the short arm of chromosome 5 was substituted from 3–79 (G. barbadense L.) into TM-1 (G. hirsutum) a positive genetic association with flower numbers during this flowering period was exhibited. CS-B05sh had comparable flower numbers with three cultivars, Deltapine 90, Phytogen 355, and Stoneville 474 and more flowers than, Sure Grow 747, Sure Grow 125, and Deltapine 5415. Different patterns for additive and dominance effects on cumulative flowers were observed across weeks of flowering. Dominance effects were more apparent during the early part of the flowering period while additive effects were more apparent towards the end of the flowering period.
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Abbreviations
- CS-B:
-
chromosome or chromosome arm substituted from Gossypium barbadense into G. hirsutum
- AD:
-
additive dominance genetic model
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McCarty, J.C., Wu, J., Saha, S. et al. Effects of chromosome 5sh from Gossypium barbadense L. on flower production in G. hirsutum L.. Euphytica 152, 99–107 (2006). https://doi.org/10.1007/s10681-006-9183-7
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DOI: https://doi.org/10.1007/s10681-006-9183-7