水稻穗重与叶片茎秆性状的关系

本文应用相关分析、回归分析和通径系数分析法,研究了十三个粳稻品种的叶片和茎秆性状与穗重的关系。结果表明:1.稳重与茎秆粗、穗颈粗和单位茎秆重有明显的正相关,与株高的相关不显著。这表明只要(?)秆粗壮,矮秆亦有可能形成大穗。2.抽穗后上部外片的面积和比叶重对穗重均有较大的直接作用。叶绿素含量和比叶重通过叶面积对穗重的正间接作用亦很大。叶面积对穗重的影响与这两个性状密切相关。3.抽穗后剑叶和第2叶相对较小的“下位叫优势型”品种,穗重与各叶面积呈正相关;剑叶和第2叶相对较大的“上位叶优势型”品种,穗重与各叶比叶重的关系更加密切。

The Relationships between the Characters of Leaf and Stem and the Panicle Weight in Rice Varieties

In this article, methods of correlation analysis, regression analysis and path analysis were used to study the response of panicle weight of japonica rice varieties to the leaf and stem characters. The conclusions are as follows: 1. Panicle weight had positive correlation with stem thickness, the thickness of neck of spike and the unit weight of stem, but had no distinct correlation with plant height. This suggests that with thick, sturdy stems, even dwarf plants can form big panicles. 2. Upper leaf area and specific leaf weight after heading had a larger direct contribution to panicle weight, while the effects of chlorophyll content and specific leaf weight on panicle weight were indirect ones. The effect of leaf area on panicle weight had close relation with chlorophyll content and specific leaf weight. 3. Panicle weight had positive relation with leaf area in varieties with smaller flag and second leaves, while it had more close relation with specific leaf weight in varieties with larger flag and second leaves.