甜玉米含糖量性状的遗传研究

Studies on Genetic of Sugar Content of Sweet Corn

选用农艺性状遗传差异较大的13份甜玉米自交系做杂交亲本材料,按照增广NCⅡ不完全双列杂交方法组配42个杂交组合,对甜玉米的含糖量与主要农艺性状进行了相关和通径分析,结果表明:含糖量与穗粗、单穗重、秃尖长等呈正相关,相关系数分别为0.298 4、0.222 3、0.215 9。在诸多性状中,对含糖量直接作用最大的性状是穗行数,效应值为0.578 9,其次是株高,效应值为0.240 8;单穗重通过行粒数对含糖量间接作用最大,效应值为0.147 6,其次是穗位高通过株高对含糖量的间接作用,效应值为0.142 4。

Thirteen inbred lines of sweet corn with great genetic diversity were used as parents, 42 crossing combinations were made according to incomplete dialed cross. Correlation and path analysis of sugar content and main agronomic characteristics of sweet corn were studied. The results indicated that the sugar content were positively correlated with ear diameter, the average weight of ear, bald length, the correlation coefficient were 0.2984, 0.2223, and 0.2159. Among those characters, the greatest contribution to sugar content was the number of row per ear, the efficient was 0.5789. The second was plant height, the efficient was 0.2408. The greatest indirect effect to sugar content was single ear weight by influencing grain number per row, the efficient was 0.1476. The second was ear height by influencing plant height, the efficient was 0.1424.