锐药竹种子苗光合生理生态特性分析

Research on Photosynthetic Eco-physiological Characteristics of Oxytenanthera abyssinica Seedlings

摘要:

为了解引自埃塞俄比亚的锐药竹（Oxytenanthera abyssinica）幼苗的生长情况，对2年生竹株的光合生理生态特性进行了研究。结果表明，锐药竹的Chl a/b接近2.3∶1，Chl b含量偏高，说明具有一定的耐阴性。当光照强度为800~1600 μmol m^-2s^-1时，未出现光抑制现象，表明其对光照具有较强的适应性。锐药竹的表型性状与生理生态性状间存在较好的相关性。根据主成分分析，确认Chl b、ФPSⅡ、Chl a、Fo为其主成分因子，累计方差贡献率达86.89%。根据种质聚类分析，可划分为4个类型。因此，锐药竹实生苗单株在表型、生理生态性状上存在较大差异，具有遗传保育的形态、生理基础。

Abstract:

In order to understand the growth of Oxytenanthera abyssinica introduced from Ethiopia in Africa, the photosynthetic physiolgical ecology characters of two-year-old seedlings planted in Zhanjiang, Guangdong Province, China were studied. The results showed that the Chl a/b value was about 2.3∶1, the high Chl b content indicated that O. abyssinica had a certain tolerance of shade. When the light intensity ranged from 800 to 1600 μmol m^-2s^-1, the photo-inhibition of O. abyssinica was not appeared, showing strong light adaptability. There were good correlation between phenotypic traits and eco-physiological traits. According principal compenent analysis, the four factors, such as Chl b, ФPSⅡ, Chl a and Fo, were principal components, their accumulated variance contribution rate was up to 86.89%. The all seedlings were divided into four types by the cluster analysis. Therefore, there were significant differences in phenotypic and eco-physiological characters among O. abyssinica individuals, which would be provided with morphology and physiological basis in genetic breeding.