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围绕着光合速率、呼吸速率、单株叶面积、叶片空间分布特征和生育期等光合特性,对我国目前常用玉米自交系进行了系统聚类分析.根据参与聚类的性状为单个、2个、3个和5个,分别将这些自交系分成若干组.依吐丝期前后玉米光合生产能力最大时期的单株叶面积和光合速率两个性状,将132个目前我国常用玉米自交系资源划分成十类,并建立了相应的分类判别模型.分类的结果还表明,我国目前常用玉米自交系以中等叶面积大小光合速率中等和大叶面积光合速率较高的类型为主,未出现大叶面积低光合速率和小叶面积高光合速率两种类型.说明为了取得玉米光合生理育种的进展,还需进行遗传重组,扩大丰富基因类型.
Based on the photosynthetic rate, respiration rate, leaf area per plant, spatial distribution characteristics of leaves and the photosynthetic characteristics such as growth period, the current cluster analysis of maize inbred lines in our country was conducted based on the single, , 3 and 5 respectively.These inbred lines were divided into several groups.According to two characteristics of leaf area per plant and photosynthetic rate of maize under the maximum photosynthetic production capacity before and after the silking stage, 132 maize inbred lines The resources were divided into ten categories and the corresponding classification discriminant model was established.The results also showed that the most commonly used type of maize inbred lines in the medium leaf area in the medium and large leaf area photosynthetic rate of the higher type of photosynthetic rate is mainly not There are two types of photosynthetic rate with large leaf area and high photosynthetic rate with leaf area, indicating that in order to obtain the progress of photosynthetic physiological breeding in corn, genetic recombination is needed to expand the types of rich genes.