甘薯主要经济性状的遗传倾向及其相关性分析

以甘薯杂交后代155个株系及两亲本为试验材料,对甘薯主要经济性状的遗传规律及其相关性进行研究与分析。结果表明,甘薯杂种后代性状分离很广,调查性状在子代中均出现连续变异分布,符合数量性状遗传规律。供试分离群体材料的胡萝卜素含量变异幅度最大,CV为117.6%;变异最小的性状是淀粉含量,CV仅为10.8%;茎叶干率、蛋白质含量、淀粉含量和单株结薯数等性状的遗传力相对较高,均在100%以上;茎蔓长、茎粗、薯块干率和还原糖含量等性状的遗传传递力居中,在91.4%~95.7%;分枝数、单株茎叶鲜质量、单株鲜薯质量、胡萝卜素和可溶性糖含量的组合遗传力较低,在51.9%~82.1%;选择茎粗适中、蔓长适中、分枝数多、结薯数多、茎叶鲜质量较大以及茎叶干率较低的株系,可以达到甘薯高产育种的目的。经相关性分析可知,要同时提高胡萝卜素、还原性糖和可溶性糖含量等3个性状难度不大,而要同时提高胡萝卜素、淀粉、还原性糖、可溶性糖和蛋白质等5个重要品质性状很困难。本试验表明,高产高淀粉品种选育相对比较容易,而高产高蛋白质品种选育有一定难度。

Inherited Tendency and Correlation of Main Economic Traits in Sweetpotato

The genetic law and correlation of the main economic characters of sweetpotato were analyzed using 155 hybrids and two parents as the test material.The results showed that the distribution range was wide,and the 13 economic traits varied substantially in the progenies,corresponding to the hereditary law of quantitative traits.The highest variance was found in carotene content,CV=117.6%.The variance was lowest in starch content,CV=10.8%.The combination heritability(Ta) of dry matter content of vines,protein ...