山东省中熟玉米杂交种穗部性状的分析

CORRELATION AND PATH-WAY ANALYSIS OF THE EAR CHARACTERISTICS OF MID-MATURITY HYBRID MAIZ(ZEA MAYSL.)IN SHANDONG PROVINCE

分析了山东省1980～1988年9年中熟组玉米杂交种区域试验和生产示范试验共54个杂交种的产量与穗部性状的关系,结果表明:当亩产量在450kg以下时,起主要作用的是穗粒数、千粒重和穗长,其次是穗行数和双穗;当亩产量在450kg以上时,起主要作用的是穗行数,其次是穗粒数、千粒重和双穗。由此认为,在选育中熟高产(亩产450kg以上)玉米杂交种时.需协调好穗行数、穗粒数与千粒重的关系,使千粒重保持在300g的前提下,应着重对穗行数和穗粒数的选择。

For mid-maturity hybrid maize were established the relationships between yield and its characteristics by analysis of the nine year's provincial trial tests and farm trial data from 1980～1988 In shandong. It was shown that when the yield was below 4.65t/ha no. of kernels per ear, 1000 kernel weight and the length of ear would exert greater influence over no. of ear lines and percentage of double-eared plants. By contrast if the yield was above 4.65t/ha no. of ear lines would carry more weight than percentage of double-eared plants, kernel number and 1000 kernel weight. Hence in an attempt to breed for a high-yielding(over 4.65t/ha) mid-maturity hybrid attention should be paid to no. of ear lines and kernel number given 1000 kernel weigth at 300g.