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Genetic Diversity of the Upland Cotton Varieties Bred in North Xinjiang Region Revealed by Agronomic Phenotypes  

Xiantao Ai , Xueyuan  Li , Junduo  Wang , Juyun  Zheng , Hong  Sha , Tuerxunjiang  , Likun  Duo , Ming  Mo
Economic Crop Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, 830091, R.P. China
Author    Correspondence author
Cotton Genomics and Genetics, 2012, Vol. 3, No. 2   doi: 10.5376/cgg.2012.03.0002
Received: 18 Sep., 2012    Accepted: 15 Oct., 2012    Published: 20 Nov., 2012
© 2012 BioPublisher Publishing Platform
This article was first published in Molecular Plant Breeding (2011, Vol.9, No.1, 113-122) in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:

Ai et al., 2012, Genetic Diversity of the Upland Cotton Varieties Bred in North Xinjiang Region Revealed by Agronomic Phenotypes, Cotton Genomics and Genetics, Vol.3, No.2 8-16 (doi: 10.5376/cgg.2012.03.0002)

Abstract

We attempted to reveal the genetic background and phenotypic characteristics of the varieties bred in Northern Xinjiang through the study on genetic diversity of the 38 cultivated varieties approved in Xinjiang. The results showed that the trait of the fruit branch number in the 13 tested phenotypic traits had the highest genetic diversity index; along with the year in different breeding period, the bred cotton varieties exhibited that the growing period gradually shortened, fruit-branch number increased, cotyledon node and plant height significantly increased; and boll weight per boll obviously increased, seed index also showed an upward trend with boll weight changes; the boll number per plant and lint percentage also presented overall increasing trend, however, the lint percentage left a great space to be enhanced; the fiber length and strength gradually increased in the bred varieties, and micronaire values showed a downward trend. Overall the quality traits went to be reasonable with each passing periods. Genetic analysis indicated that 38 domestic bred varieties could be clearly divided into two groups with similar phenotypic traits, similar genetic background, the same breeding unit and the same type varieties were better clustering together. The clustering results would be relatively accord with the evolution trend in their real characteristics and genetic background. Overall, the domestic bred varieties had become major cultivating varieties in Northern Xinjiang, The reason would lie in the reasonable utilization of the genetic composition from the American components and the Yellow River cotton germplasms as well as Liaomian cotton series of special early maturing cotton area, which would provide insights, basis and developing direction to break out the genetic component narrow issues in Xinjiang cotton breeding program.

Keywords
Upland cotton; Domestic bred varieties in North Xinjiang region; Phenotype traits; Genetic diversity
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. Xiantao Ai
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. Tuerxunjiang 
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