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Li Xianghua Chang Ruzhen (Institute of Crop Germplasm Resources, CAAS,Beijing 100081)  
Soybean cultivars currently grown in the world have a relatively narrow genetic base, so it is important to characterize the diversity of the germplasm accessions.The objectives of this study were to reaveal the variabilities of eighteen quantitative characters including growth period, yield and chemical traits of soybean varieties of the spring soybean population in China. The estimates of genotypic, genotypic coefficient of variation (GCV), heritability and relative expected genetic advance (△G′) of these characters were calculated, indicated that the genetic resources of quantitative characters of the spring soybean varieties are very abundant.Heritabilites of growth period, chemical traits, seed shape index, 100-seed weight, No. of nodes on main stem and plant height were high (85%). Excluded that chemical characters (prtein content, oil content, protein plus oil content), days from flowering to maturity and days of growth had low GCV, other traits had moderate or great GCV. Only the oil content and protein content characters had low △G′, other characters had moderate or great △G′, especially the △G′ of plant height, No. of branches, No. of pods on main stem, No. of pods on branches, seed weight per plant, percentage of good seeds, days to flowering, yield characters were very high (100%). Estimates of genotypic correlation between yield and other characters indicated that, population yield is positively and significantly correlated with No. of pods on main stem, No. of pods per plant, No. of seeds per plant, seed weight per palnt, 100-seed weight and days from flowering to maturity; but showed a significant negative association with days to flowering. The correlation analysis can be used in progeny selection.
【CateGory Index】: Q31,S565.1
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