Genetic analysis and QTL mapping of oil content and seed index using two recombinant inbred lines and two backcross populations in Upland cotton.

Autor: Shang, Lianguang, Abduweli, Abdugheni, Wang, Yumei, Hua, Jinping, Jenkins, J.
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Zdroj: Plant Breeding; Apr2016, Vol. 135 Issue 2, p224-231, 8p
Abstrakt: Cottonseed is one of the main by-products of cotton. To explore the genetic composition of oil content ( OC) and seed index ( SI) is helpful for utilizing the cottonseed. Under multiple environmental conditions, the genetic structures of OC and SI were explored using two recombinant inbred lines ( RILs) and corresponding backcross ( BC) populations in Upland cotton. Twenty-four and 31 quantitative trait loci ( QTLs) for OC and SI, respectively, were detected using composite interval mapping, in which 9 QTLs for OC and 18 QTLs controlling SI were simultaneously identified in more than two environments or two populations. Forty-seven and 37 QTLs with main effects (M- QTLs) for OC and SI and 114 and 74 QTLs involved in digenic interactions (E- QTLs), respectively, identified by inclusive composite interval mapping. On average, the E- QTLs explained a larger portion of the phenotypic variation than the M- QTLs did. It was concluded that additive effects of single-locus and epistasis derived from complementary loci with few detectable single-locus effects played an important role in oil content and seed index in Upland cotton. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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