山核桃果皮黄酮提取液对四种作物苗期光合性能的影响

采用6种浓度山核桃果皮黄酮提取液（0.1～2.0mg·L^-1）处理盆栽小麦、玉米、大豆和绿豆幼苗,研究对苗期叶片光合速率、气孔导度、蒸腾速率、细胞间隙CO2等光合性能的影响.结果显示：在试验浓度范围内,黄酮提取液对四种作物苗期的光合性能具有低浓度促进、高浓度抑制影响;0.1、0.5mg·L^-1黄酮提取液提高了叶绿素a、叶绿素b和叶绿素总量,促进光合速率、气孔导度、蒸腾速率,适当增加细胞间隙内部的CO2浓度,以0.1mg·L^-1处理效果最明显,与对照相比,四种作物的叶绿素总量和光合速率最高增加了20.9%和21%,处理的影响达显著或极显著水平（（P〈0.05或P〈0.01）;超过0.5mg·L^-1叶绿素含量、光合速率、气孔导度、蒸腾速率逐渐降低,细胞间隙的CO2浓度快速增加.研究表明,适宜浓度的山核桃黄酮提取液具有提高叶片叶绿素含量,促进气孔开放度,增加对细胞内的CO2供应,改善叶片光合性能的作用.

Effect of Flavone Extract from C.cathayensis Exocarp on Photosynthetic Characteristics of Four Different Kinds of Crop Seedling

Using six kinds of concentration（ranged from 0.1 to 2.0mg·L^-1） of flavone extract from C.cathayensis Exocarp treated corn,soybean,wheat and mung bean seedlings,in order to study the photosynthetic rate,stomatal conductance,transpiration rate,intercellular CO2 on the seedling leaf.Results showed that within the range of concentration in the experiment,the effects of flavone extract（0.1 to 0.5mg·L^-1） increased content of the chlorophyll a,chlorophyll b and total chlorophyll,promoted photosynthetic rate,stomatal conductance,transpiration rate,proper increased cell gap inside the CO2 concentration.0.1mg·L^-1 treatment effect was the most obvious compared with the control,reached the significant point（P〈0.05 or P〈0.01）,the total chlorophyll and photosynthetic rate were increased 20.9% and 21%;more than 0.5mg·L^-1,the chlorophyll content,photosynthetic rate,stomatal conductance,transpiration rate decreased,the intercellular CO2 rapid increased.Research shows that,the appropriate concentration of flavone extract from C.cathayensis exocarp can increase the chlorophyll content in the leaf,promote stomatal opening,increase of intracellular CO2 supply,improve leaf photosynthesis efficiency.