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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (06): 940-944.doi: 10.3724/SP.J.1006.2010.00940

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Construction of IF2 Population and Its Application in Studies on Genetic Effects and Heterosis for Fiber Quality in Upland Cotton (G. hirsutum L.)

KONG Guang-Chao1,2, QIN Li1, XU Hai-Ming1,ZHU Shui-Jin1,*   

  1. 1Agronomy Department,College of Agriculture and biotechnology,Zhejiang University,Hangzhou 310029,China,2Agronomy Department,Shihezi University,Shihezi 832002,China
  • Received:2009-10-06 Revised:2010-01-25 Online:2010-06-12 Published:2010-03-15

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Abstract:

Genetic analysis and heterosis prediction for fiber quality are very important in cotton breeding. An immotalized F2 (IF2) population with 188 combination F1 in upland cotton was developed by random mating among recombinant inbred lines (RIL) derived from a intraspeciifc hybridization between HS46 and MARCABUCAG8US-1-88, and its fiber quality traits were evaluated. Based on the IF2 population, we analyzed the genetic effects and heterosis of cotton fiber with the additive-dominance genetic model. The results showed that the values of all the five fiber quality traits, fiber length (FL), fiber uniformity (FU), fiber micronaire (FM), fiber elongation (FE) and fiber strength (FS), were distributed normally, and wider variations than those of its RIL population were found for the five fiber quality traits in the IF2 population. The genetic dissection and heterosis prediction analyses indicated that a significant heterosis was found in fiber quality traits. The interaction effect between additive and environment played an important role in cotton fiber quality, following by the additive effect. Their heterosis was affected greatly by the environment effects, and there were significant difference between two environments in the experiment. All these results indicate that the IF2 population is an ideal research population in genetic analysis and heterosis prediction for cotton fiber quality and other agronomic characters.

Key words: G.hirsutum L., Immotalized F2 population(IF2), Fiber quality, Heterosis

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