大豆品种叶部性状与光合速率关系的研究

本试验以20个大豆[Glycine max (L) Merr]品种为试材对叶部形态、生理性状及解剖特征进行了测定,加以相关和通径分析,并首次对10个叶部光合性状进行主成份分析。研究表明:(1)叶形指数与光合速率呈负相关,表现为很小的负效应。(2)单位叶面积的叶绿素、全N含量均与光合速率呈正相关,表现为正效应。(3)比叶重与光合速率呈正相关,表现为极小的正效应,且通过叶片厚度的间接正效应远大于其直接效应。(4)叶片厚度与光合速率呈极显著正相关,表现为正效应。(5)栅栏细胞数目与光合速率呈极显著正相关,表现为较高的正效应。(6)栅栏、海绵组织厚度与光合速率分别呈极显著和显著正相关,但均表现为负效应。分析表明:通径分析与主成份分析相结合的方法是进行光合速率综合的间接选择的有效方法。

STUDY ON THE RELATIONSHIP BETWEEN LEAF CHARACTERS OF SOYBEAN VARETIES AND PHOTOSYNTHETIC RATE

Leaf morphological, physioiogical and dissectional characters were tested in this experiment involving 20 soybean (Clycine max (L) Merr) varieties. Correlation analysis and path-analysis were computed, and the first time principal component analysis was used to 10 photosyn-thetic characters of leaf. The results indicated the following: (1) Leaf shape index was negatively correlated to the photosynthetic rate, and suggested a vevy little negative effect. (2) Photosynthetic rate was positively correlated to chlorophyll contend and whole nitrogen content of unit leaf area, respectively, and suggested positive effect, (3) Specific leaf weight indicated positive correlation with the photosyn-thetic rate, showing atiny positive effect, and its positive indirect effect through leaf thickness was far greater than its direct effect. (4) Leaf thickness indicated very signifficant positive correlation with the photosynthctic rate, showing positive effect. (5) The number of palisade cells was positively correlated to photosynthetic rate at very significant levl, showing higher positive effect. (6) The photosynthetic rate was positively correlated to the thickness of palisade tissue and spongy tissue at very significant level and significant level, respectively, but both showed negative effects. Analysis indicated that it is an effective method to combine path-analysis with principal component analysis for integrated indirect selection of photosynthetic rate.