关键词: 九牛草（Artemisia stolonifera）, 光合参数, 叶绿素荧光, 种质资源

Abstract: In order to select high and stable germplasm resources of Artemisia stolonifera, photosynthetic fluorescence parameters of leaves of different phenotypes of Artemisia stolonifera were evaluated. Artemisia stolonifera planted in Sunjia Village, Zhangshu City, Jiangxi Province was used as experimental material, and six phenotypes of Artemisia stolonifera were used as test objects. The chlorophyll photosynthetic fluorescence parameters were determined by portable photosynthesometer, and the photosynthetic capacity and potential adaptability of different phenotypes were evaluated by variance analysis, principal component analysis and membership function analysis. The results showed that the phenotypic leaf morphology of the 6 species was significantly different, and the photosynthetic parameters and chlorophyll fluorescence parameters of the leaves of different phenotypes were significantly different. The net photosynthetic rates of dark green large leaf type [（16.260±3.585） μmol/（m²s）] and light green narrow leaf type [（17.366±3.982） μmol/（m²s）] were significantly higher than those of the other 4 phenotypes. Principal component analysis showed that net photosynthetic rate, intercellular carbon dioxide concentration, water vapor pressure deficit value, initial fluorescence value and maximum fluorescence value under dark adaptation were important contributing variables. The results of membership function value calculation showed that light green narrow leaf type（0.58）, dark green large leaf type（0.53） and dark green narrow leaf type （0.50） had higher comprehensive ranking scores and were suitable as candidate excellent germplasm.

Key words: Artemisia stolonifera, photosynthetic parameters, chlorophyll fluorescence, germplasm resource