Differentiation in the genetic basis of stem trichome development between cultivated tetraploid cotton species

Abstract Background Cotton stem trichomes and seed fibers are each single celled structures formed by protrusions of epidermal cells, were found sharing the overlapping molecular mechanism. Compared with fibers, cotton more easily observed, but mechanisms underlying their development still poorly understood. Results In this study, Gossypium hirsutum ( Gh ) G. barbadense Gb) to differ greatly in percentages varieties/accessions glabrous stems trichome density, length, number per trichopore. varieties normally had long singular clustered trichomes, while Gb short trichomes. Genetic mapping using five F 2 populations from crosses between those different types revealed that much variation among phenotypes could be accounted for combinations genes/alleles on Chr. 06 24. The twenty- six 1 generations varied phenotypes, further suggesting tetraploid controlled genes/alleles. modern varieties, a greater proportion wild accessions or shorter denser trichomes; whereas smaller primitive stems. A close correlation fuzz fiber density was observed both varieties. Conclusion Based these findings, we hypothesize evolved parallel during domestication cultivated cotton. addition, current results illustrated can used as morphological index quality conventional breeding.