Genome-wide assessment of genetic diversity and fiber quality traits characterization in Gossypium hirsutum races

doi:10.1016/S2095-3119(17)61671-X

摘要/Abstract

Abstract: Gossypium hirsutum races are believed to be potential reservoirs of desirable traits, which can play crucial roles to overcome the existing narrow genetic base of modern Upland cotton cultivars. However, prior to utilizing the races in cotton improvement programs, understanding their genetic constitutions is needed. Thus, this study used molecular and morphological techniques to characterize 110 G. hirsutum germplasm including 109 semi-wild accessions and one Upland cotton cultivar, CRI12. In the study, 104 SSR markers detected 795 alleles, with an average of 7.64 alleles per marker, ranging from 3 to 14, and average polymorphism information content (PIC) value of 0.71. And 96 of the markers were found to be highly informative, with PIC value≥0.50. Pairwise genetic similarity coefficient across the accessions ranged from 0.19 to 1.00, with an average value of 0.46. Morphological characterization was done using fiber length, fiber strength, micronaire, fiber uniformity index, and fiber elongation. Pairwise taxonomic distance within the accessions ranged from 0.17 to 3.41, with a mean of 1.33. The SSR and fiber quality traits data set based unweighted pair group method of arithmetic mean (UPGMA) analysis grouped the accessions into 7 and 12 distinct clusters, respectively, that corresponds well with the results of principal component analysis (PCA). Our study revealed the existence of vast molecular and morphological diversities within the accessions and provided valuable information on each semi-wild accession for quick and better informed germplasm utilization in cotton breeding programs.

Key words: semi-wild accessions , Gossypium hirsutum , SSR markers , genetic similarity , taxonomic distance

. [J]. Journal of Integrative Agriculture, 2017, 16(11): 2402-2412.

Kiflom Weldu Okubazghi, LI Xiao-na, CAI Xiao-yan, WANG Xing-xing, CHEN Hao-dong, ZHOU Zhong-li, WANG Chun-ying, WANG Yu-hong, LIU Fang, WANG Kun-bo. Genome-wide assessment of genetic diversity and fiber quality traits characterization in Gossypium hirsutum races[J]. Journal of Integrative Agriculture, 2017, 16(11): 2402-2412.

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