ÃÞ »¨ ѧ ±¨ Cotton Science 2009£¬21(5)£º361-365
Genetic Variations and Selection Indices of Quantitative Traits in Upland Cotton( Gossypium hirsutum L.) Lines with High Fiber Quality Abstract£ºTwelve characters within twenty high quality lines from the double crosses of twelve diverse upland cotton parents were measured in a randomized, complete block at the Agriculture Experimental Station of Jiangxi Agricultural University, Nanchang , China in 2007. The genetic variation, heritability, genotypic correlation and selection index of yield and fiber traits were calculated. The genetic variation coefficients of seed cotton yield per plant, lint yield per plant and bolls per plant were 16.64%, 14.71%, and 10.65%, respectively, higher than that of fiber traits varied from 1.39% to 6.72%. These results suggest a high availability of further improvement of yield in the population with high fiber quality, but of less selection potentiality for fiber traits. Among yield and yield components characters, lint percentage and boll weight produced the highest broad-sense heritability, 89.1% and 81.85% respectively. The lowest broad-sense heritability was found in lint yield per plant(55.05%). Fiber traits all exhibited high broad-sense heritability, ranging from 79.07% to 89.47%. Lint yield per plant and bolls per plant were significantly and positively correlated, as were bolls per plant and number of fruiting branches. Twenty selection indices were constructed with one to four characters. The expected genetic advance of them were estimated. The efficiencies of the selection indices including the single plant lint yield itself and other highly correlated characters were better than those without lint yield per plant. The highest efficiency was recorded in the selection index consisting of lint yield per plant, bolls per plant, number of fruiting branch, number of boll position, higher than that of selection of single plant lint yield alone by 12.06%.
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