不同砧木嫁接黄瓜盛瓜期光合特性研究

Studies on Photosynthetic Characteristics of Grafted Cucumbers in Fruitive Period by Different Rootstocks

采用LI-6400光合测定系统对嫁接苗Y3、Z2和自根苗(接穗)盛瓜期的光合特性进行了研究。结果表明:嫁接苗和自根苗的光合速率日变化均呈双峰曲线,并有明显的光合"午休"现象,黄瓜嫁接苗日均光合速率均高于自根苗。嫁接苗的光饱和点、光饱和光合速率显著高于自根苗,Y3的光补偿点显著低于其他两个处理,反映了Y3利用强、弱光的能力均较强。Z2的CO2饱和点显著高于自根苗,其利用高浓度CO2的能力较自根苗强。嫁接苗的CO2补偿点显著高于自根苗,Y3显著高于Z2。Y3的叶绿素a、叶绿素a+b含量显著高于自根苗;可溶性蛋白含量显著高于Z2,反映了Y3的RuBP羧化酶含量高于Z2。嫁接苗Y3的产量显著高于其两个处理,Z2显著高于自根苗。

The photosynthetic characteristics of grafted cucumbersY3,Z2 and self-rooted were studied by using the Li-6400 portable photosynthesis system. The results showed that the diurnal changes of photosynthetic rate（Pn） of grafted cucumber and self-rooted showed a double peak curve, and there was a significantly photosynthetic ＂noonbreak＂, and the photosynthetic rates of grafted seeding were higher than the self-rooted. The light saturated point and light saturated Pn of grated seeding were signifieantly higher than the self-rooted and the light compensation point of Y3 than other two treatments,which showed that Y3 has a good ability of low light. The CO2 saturated point of Z2 was significantly hig tilizing high concentration of CO2 for Z2 was stronger than sel grated seeding was significantly higher than self-rooted, and was significantly lower ng both the strong and her than self-rooted,and the ability of u- f-rooted. The COz compensation point of Y3 was s contents of Chla and Chl（a＋b） for Y3 were significantly higher than ignificantly higher than Z2. The self-rooted ; the soluable protein content of Y3 was significantly higher than Z2,which reflected that the content of RuBP carhoxylase for Y3 was higher than Z2. Grated seeding of Y3 showed a highest yield,which was significantly higher than other two treatments,and Z2 was significantly higher than self-rooted seeding.