聚-γ-谷氨酸对小白菜生长和光合作用的影响

采用水培方法研究了聚-γ-谷氨酸对小白菜地上部生长、叶片叶绿素含量、光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)和蒸腾速率(Tr)的影响。结果表明,随着养分含量的降低,聚-γ-谷氨酸处理小白菜较对照叶片Pn、Gs、Tr和Ci均有提高;在90%养分含量下施加聚-γ-谷氨酸显著提高了叶片中叶绿素a的含量;在70%～100%养分含量范围内,小白菜地上部产量较对照均有所提高,说明聚-γ-谷氨酸可通过降低气孔限制值、增加叶绿素含量和提高吸收光强的能力,从而促进小白菜对光能的捕获及其转化,提高其光能利用效率。

Growth and photosynthesis characteristics of Chinese cabbage under poly-γ-glutamic acid

A hydroponic experiment was used to study the effects of poly-γ-glutamic acid addition on the growth of Chinese cabbage and its photosynthesis characteristics,such as net photosynthesis rate(Pn),stomatic conductance(Gs),intercellular CO2 concentration(Ci),and transpiration rate(Tr).The results shows that the level of Pn,Gs,Tr and Ci in Chinese cabbage leaf treated with poly-γ-glutamate acid increases compared with control when the concentration of nutrient decreases.The application of poly-γ-glutamate acid with 90% nutrient concentration significantly increased chlorophyll a in Chinese cabbage leaves.When the nutrient concentration was 70%-100%,the above ground yield of cabbage improved compared with control,meaning that poly-γ-glutamate acid can promote transformation of light,energy capture,increase the energy efficiency through reducing the stomatal limitation,increasing the chlorophyll content and the capacity of absorption of light intensity.