| 摘要: |
| 本研究对国内9份和国外15份甜高粱自交系品种的45个农艺性状和品质性状在新疆干旱区的表现进行遗传参数分析。目的是了解甜高粱种质资源在新疆干旱区的表现,为新疆干旱区甜高粱品种选育提供参考依据。遗传多样性分析表明,主要农艺、产量及品质性状的遗传多样性指数平均为1.831 9,明显高于分级性状的0.779 6。其中,茎秆产量的遗传多样性指数达到1.817 2,茎秆可溶性总糖含量遗传多样性指数为1.946 9。变异系数分析表明,各性状的遗传变异潜力较大。其中,叶鞘可溶性总糖含量变异系数最大为50.3%,播种-出苗期变异系数最小为5.7%,总体平均为23.9%。遗传参数分析表明,农艺性状平均广义遗传率为0.74;产量性状平均广义遗传率为0.92;各品质性状平均广义遗传率为0.93,其中茎秆可溶性总糖的广义遗传率达到0.99。进一步分析发现茎秆产量和茎秆可溶性总糖含量的相对遗传进度分别为81.1%和84.9%,可获得遗传增量分别是122.3和212.3 g/kg,说明该甜高粱群体的茎秆产量和茎秆可溶性总糖含量均有着巨大的改良潜力。 |
| 关键词: 甜高粱 生物量 碳水化合物 遗传多样性指数 广义遗传率 遗传进度 |
| DOI：10.11841/j.issn.1007-4333.2012.06.008 |
| 投稿时间：2012-06-30 |
| 基金项目:国家能源局能源节约和科技装备司项目(科技司函[2012]32号) |
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| Analysis of genetic diversity and inheritability of agronomic traits and chemical compositions in sweet sorghum(Sorghum bicolour) |
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WANG Ji-shi1, LIU Zu-xin1, FAN Fan1, HAN Li-pu2, XIE Guang-hui1
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| (1.College of Agronomy and Biotechnology/National Energy R&D Center for Non-food Biomass,China Agricultural University,Beijing 100193,China;2.Center for Agricultural Resources research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Shijiazhuang 050021,China) |
| Abstract: |
| Twenty-four sweet sorghum(Sorghum bicolour) varieties were selected in the study to analyze genetic diversity and inheritability of 45 agronomic traits and chemical compositions.The objective is to examine the performance of sweet sorghum germplasm in the arid area and then to assist its breeding in Xinjiang province.The results showed:the mean value of coefficient of genetic diversity (H') in quantity characters (1.831 9) was much higher than that in classified characters (0.779 6).H' for yield and soluble sugar content in stem were 1.817 2 and 1.946 9,respectively.Great genetic variation was observed.The mean value of coefficient of genetic variance (CV) was 23.9%,with the largest one (50.3%) in leaf sheath soluble sugar content and the least one (5.7%) in sowing-emergency duration.Further analysis found that the mean value of broad sense heritability (hB2) in agronomic,yield and chemical composition traits were 0.74,0.92,0.93,respectively,including hB2 for stem soluble sugar content (0.99).Relative genetic advance (△G) analysis revealed that △G of stem yield and stem soluble sugar content were 81.1% and 84.9%,and its genetic gain (G) were 122.3 and 212.3,respectively.Results revealed that stem yield and stem soluble sugar content of sweet sorghum had great potential for further genetic imporvement. |
| Key words: sweet sorghum biomass carbohydrates genetic diversity index broad sense heritability genetic gain |
