穗上节间数与玉米抗倒伏能力的相关性分析

Correlation analysis of the internode number above ear and lodging resistance in maize

以4个黄改系和20个来自美国杂交种的自选系为材料,利用NCⅡ设计,分析了玉米穗上节间数与穗位高、株高以及子粒重之间的关系.结果表明,株高是影响玉米子粒重的主要因素,两者呈极显著的正相关,通径系数为2.753 1.穗上节间数与穗位高及穗位高/株高呈显著和极显著负相关,同时穗位高/株高的增加是造成玉米子粒重降低的关键因素之一,与子粒重的通径系数为-2.242 9;通过增加穗上节间数来降低穗位高是一种提高植株抗倒伏性的可行途径.

Four inbred lines derived from Tangsipingtou heterotic group and twenty inbred lines selected from the US hybrids used as materials, this paper aims to study the relationship between the internode number alcove ear and ear height, plant height, as well as grain yield by means of NC II design. The results showed that plant height had significantly positive correlation with plot yield, and was a key factor to grain yield with the largest path coefficient of 2. 753 1. The internode number above ear had significantly negative correlation to ear height and the ratio of ear height to plant height. The increase of the ratio of ear height to plant height might have dominant effect on plot yield with a low path coefficient of - 2. 242 9, providing feasibility of improving plant lodging resistance by decreasing the ear height relying on increasing internode number above ear.