玉米梯度热带群体株高和穗高遗传变异研究

【研究目的】为创新玉米育种新材料。【方法】选用热带种质按照不同比例导入到温带种质中，构建梯度热带种质群体，以梯度热带种质群体为试验材料，探讨群体遗传潜力及性状遗传差异。【结果】研究表明，株高(PH)和穗位高(EH)群体间遗传差异极显著，梯度群体的株高和穗位高从100%热带种质群体到50%的热带种质群体呈现出逐渐增高的趋势，但变化幅度不大，当热带种质比例降到25%和12.5%时，株高和穗位高显著降低。【结论】导入12.5%或25%热带种质能产生较广泛变异，符合育种需要。

Genetic Variation of Plant Height and Ear Height of Gradient Tropical Germplasm Populations on Maize

In order to innovate maize breeding new materials,gradient tropical germplasm populations were constructed according to different proportion of tropical germplasm into temperate germplasm.Using Gradient tropical germplasm populations as test materials explored the traits genetic potential and difference.The result shown those plant height and ear height genetic differences between gradient populations were significant.Gradient populations of plant height and ear height from 100% tropical germplasm low to 50% tropical germplasm,showing a gradually increasing trend,but not the magnitude of changes.When the proportion of tropical germplasm down to 25% and 12.5%,plant height and ear height significantly reduced.