玉米杂交种产量及其构成因素的相关、逐步回归和通径分析

本文对玉米杂交种的产量及其构成因素共10种性状进行了相关分析,并在逐步回归分析的基础上进行了通径分析。结果表明,单株穗重、穗粗、单穗粒数、穗行数、株高和百粒重与小区产量有显著正相关。逐步回归分析表明,单株穗重、行粒数、百粒重和穗行数与小区产量具有显著的线性效应。通径分析表明,入选的4个性状对小区产量的直接作用都是正的。除了单株穗重的直接作用较小外,其余3个因素都较大。但行粒数和百粒重各自通过对方有一个相对较大的负间接作用,而穗行数的净作用主要由本身的直接作用决定。据此,穗行数的选择对其它主要产量因素影响不大,而百粒重和行粒数的选择必须兼顾对方,可望进一步提高产量。

A CORRELATION,STEPWISE REGRESSION AND PATH-COEFFICIENT ANALYSIS OF GRAIN YIELD WITH ITS COMPONENTS IN MAIZE HYBRIDS

Correlatiou, stepwise regression and path-coefficient analysis were used to ten characters.of maize hybrids. The ear weight per plant, plant height and 100-seed weight Were apossitively correlated with the grain Yield per plot.The ear weight per plant, seeds per row, 100-seed weight and rowsper ear had signifficantly linear effect to the grain yield per plot. Path-coefficient analygis showed that all direct effects on the grain yield were positWe and large except the ear weight per plant. Further more, the number of seedsper row and 100-seed weight had a greatly indirect and negative effect though the each partner and most of the effect of rows per ear was from its direct effect.It may be concluded that direct selection based on the number row per ear, the number seed per row and the 100-seed weight at same time should be more effective to improve the yield per plot.