不同生长型桃光合作用特性研究

利用Li-6400光合作用测定仪,在大田条件下,对不同生长型桃的净光合速率(Pn)、光补偿点(Lcp)、光饱和点(Lsp)及叶绿素含量进行了研究。结果表明,不同生长型的桃树间以矮化型桃叶片的Pn值最高,其次是紧凑型桃,垂枝型和普通型桃的较低。不同品种的桃之间以中矮29的Pn值最高,为19.01μmol/(m2·s);其次是矮丽蜜和1-14;粉垂枝和早露蟠的较低,分别是12.76μmol/(m2·s)和12.70μmol/(m2·s)。Lcp以紧凑型桃最高,矮化型桃次之,普通型、半矮化型和垂枝型桃的品种间差别较大;Lsp以紧凑型桃最高,垂枝型桃次之,普通型桃最低。各生长型桃叶片单位鲜质量的叶绿素含量以紧凑型桃为最高,普通型桃最低。叶片单位鲜质量的叶绿素含量与Pn无显著相关关系。

Research on the photosynthetic characteristics of peach trees with various growth habits

The net photosynthetic rate (Pn),light compensation point (Lcp) and light saturation point (Lsp) of peach trees with different growth types of were studied with Li-6400 Portable Photosynthesis System in the field. The chlorophyll contents of peach trees with different growth types were tested with UNICAM helios-α ultraviolet-visible light spectrometer in laboratory. The results showed : in peach trees with different growth types the Pn of dwarf trees was the highest,ranging 15.38 to 19.01 μmol/(m2·s).While those of compact trees,semi-dwarf trees,weeping trees and common trees,ranging 13.91 to 16.54 μmol/(m2·s),13.71 to 14.52 μmol/(m2·s),12.76 to 14.90 μmol/(m2·s) and 12.70 to 14.34 μmol/(m2·s) respectively. In different cultivars,the Pn of Zhongai 29 was the highest,running as high as 19.01 μmol/(m2·s),that of Ailimi and 1-14 were higher,reaching 16.79 μmol/(m2·s) and 16.54 μmol/(m2·s) respectively,and that of Fenchuizhi and Zaolupantao were lower,listing 12.76 μmol/(m2·s) and 12.70 μmol/(m2·s) separately. The Lcp of compact peach trees was the highest,that of dwarf trees were the second,and that of the varieties of common trees,semi-dwarf trees and weeping trees was different obviously. The Lsp of compact peach trees was the highest,that of weeping trees was the second,and that of common trees was the lowest. The chlorophyll content of unit mass of fresh leaves in compact trees was the highest,and that of common trees was the lowest. The chlorophyll content of unit mass of fresh leaves was not obviously relative to net photosynthetic rate (Pn).