18个苹果种质资源光合特性的比较

摘要

以18个苹果种质资源为试材,嫁接在2 a生平邑甜茶(Malus hupehensis Rehd.)砧木上.在塑料大棚条件下,用LI-6400XT光合仪控制环境条件方法测定净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间CO2摩尔分数(C1)及叶绿素含量,并计算水分利用效率(WUE)及气孔限制值(Ls),用方差分析和相关性分析对苹果种质资源光合特性进行综合评价.结果表明,18个苹果种质资源光合作用各个参数均存在显著差异,Pn与G,和Tr等显著相关,叶片单位鲜质量的叶绿素含量与Pn无显著相关性.18个苹果种质资源光合作用总体能力最高的是卡拉阿尔玛(M.niedzwetzkyana Dieck)、红海棠(M.prunifolia Mill.)和白海棠(M.prunifolia(wild.)Mill.),红沙果(M.pumila Mill.)和夏红肉(M.niedzwetzkyana Dieck.)光合能力较低.%18 apple germplasm resources were grafted on the 2-year-old rootstocks of Malus hupehensis Rehd.. The net photosynthetic rate (Pn), transpiration rate (Tr), a stomatal conductance (Gs) and intercellular CO2 concentration (Ci) were measured by means of LI-6400XT Portable Photosynthesis System within vinyl tunnel. The chlorophyll contents were analyzed with UNICAMhelios-aultravioletvisible light spectrometer in laboratory. Water use efficiency (WUE) and stomata limitation (Ls)were calculated together with a comprehensive evaluation of photosynthetic characteristics by the analysis of variance and correlation analysis. The results showed that the photosynthesis parameters of 18 apple germplasm resources were obviously different and there was a significant correlation between different Pn and Gs, Tr. The chlorophyll content of unit mass of fresh leaves was not obviously relative to Pn. Among the 18 apple germplasm resources, M. niedzwetzkyana Dieck. , M. prunifolia Mill.and M. prunifolia (Wild.) Mill. had the highest total capacity of photosynthesis, while M. pumila Mill. and M. niedzwetzkyana Dieck. had a relatively low capacity of photosynthesis.