【摘要】 为深入了解苦楝无性系光合生理特性,比较不同无性系叶片光合参数的差异。本文以5个苦楝优良无性系为参试对象,用Li-6400便携式光合作用测定仪测定叶片净光合速率(Pn)、气孔导度(Gs)、叶片蒸腾速率(Tr)和胞间CO2浓度(Ci),并进行分析比较。结果表明:参试苦楝无性系胞间CO2浓度(Ci)和生理水分利用率(WUE)存在极显著差异;叶片净光合速率(Pn)和叶片蒸腾速率(Tr)存在显著差异;气孔导度(Gs)差异不显著。苏楝J104、苏楝J7和苏楝J61净光合速率(Pn)较大,其中苏楝J61生理水分利用率(WUE)较高。更多还原

【Abstract】 To better understand the photosynthetic characteristics of Melia azedarach L. clones,investigations were made on leaf photosynthetic parameters of five different clones. Leaf net photosynthetic rate( Pn),stomatal conductance( Gs),leaf transpiration rate( Tr) and intercellular CO2 concentrations( Ci)were measured by using a portable Licor 6400 photosynthesis system( LI-6400) and then further analysed. The results showed that intercellular CO2 concentrations( Ci) and physiological water-use efficiencies( WUE) of the five different clones exhibited highly significant differences. Leaf net photosynthetic rate( Pn) and leaf transportation rate( Tr) showed significant differences while stomatal conductances( Gs)of the five clones non-significant. Among them,the three clones,J104( ‘Jiangsu 104 ’) 、J7( ‘Jiangsu7’) and J61( ‘Jiangsu 61’) had a relatively higher net photosynthetic rate than other clones. Moreover,J61 had a higher water-use efficiencies( WUE).更多还原