A comparative study on the physiological properties of the exotic species Oxalis corymbosa and the native species Oxalis corniculata under water stress
A comparative study of the growth, physiological properties and chlorophyll fluorescence parameters of the exotic species Oxalis corymbosa and the native species O. corniculata was done using single and mixed plantings and four levels of water stress. The relative water content, chlorophyll a, b and protein contents in leaves of the two species decreased with intensified water stress, and they were opposite to the electrical conductivity, MDA and O2-·. The activities of POD and SOD reached a peak under SD stress, then decreased under VD stress: the former was more sensitive to drought than the latter. At the same water stress, the physio-logical properties of O. corymbosa changed with more amplitude than that of O. corniculata, and they changed more in O. corniculata in mixed plantings than in single species planting. The F0 value increased while Fv, Fm, Fv/Fm and Fm/F0 values of the two species all decreased with intensified water stress. Compared to the CK, values of Fv, Fm, Fv/Fm of T, HT, C were significantly different (P<0. 05) under SD stress, while those of HC were significantly different (P<0. 05) under MD stress. In essence, the changes of chlorophyll fluorescence parameters were similar to those of physiological properties. All parameters showed that exotic O. corymbosa has a stronger drought-resistance ability than native O. corniculata, and also has a stronger competitive ability and photosynthetic competitive ability.
国家科技期刊平台
NSTL
万方数据
维普
