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通过测定黄淮海地区22个常用玉米自交系的玉米茎节抗折强度(节折强度,NSS),并利用光学显微镜观察其茎节显微结构,对维管束各项显微指标与节折强度进行相关及通径分析,研究玉米节折强度与茎秆显微结构之间的关系。结果表明,不同自交系间节折强度差异达显著或极显著水平;对各自交系维管束显微指标进行统计分析表明,单个维管束面积的变异系数最大,为25.06%,其次是维管束数目,为19.97%;茎节维管束数目增多不利于节折强度的提高(r=-0.54**,r=-0.55**),单个维管束面积增大有助于节折强度的提高(r=0.48*,r=0.43*)。通径分析表明,抽雄后6 d及15 d两个测定时期均为维管束个数对节折强度的直接效应最大,单个维管束面积效应次之;在花后6 d,维管束最小直径、平均直径等指标对于节折强度的贡献也主要通过维管束数目的间接效应起作用。
By determining the flexural strength (nodal strength, NSS) of 22 common maize inbred lines in Huang-Huai-Hai region and observing its microstructure with light microscopy, Intensity correlation and path analysis to study the relationship between corn break strength and the stalk microstructure. The results showed that there was significant or extremely significant difference in the nodal strength between different inbred lines. The statistical analysis of the vascular bundle micro-indices showed that the coefficient of variation of the single vascular bundle area was the largest (25.06%), followed by the vascular bundle (R = -0.54 **, r = -0.55 **). Increasing the area of single vascular bundle is helpful to improve the nodose strength (r = -0.54 **, r = -0.55 **) r = 0.48 *, r = 0.43 *). The path analysis showed that the direct effect of the number of vascular bundles on the nodal strength was greatest at 6 d and 15 d after tasseling, and the area effect of single vascular bundle was the second. After 6 d after anthesis, the minimum diameter of vascular bundle, The contribution of the average diameter and other indicators to the nodal strength is also mainly through the indirect effect of the number of vascular bundles.