钙、磷平衡对番茄光合作用特性及防御酶活性的影响

Effects of Calcium and Phosphorus Interaction on Photosynthesis and Defense Enzyme Activity of Tomato

以番茄品种"辽圆多利"为试材,采用3种钙素水平和3种磷素水平的复因子盆栽试验,研究钙、磷互作对番茄光合作用和抗病能力的影响,以揭示不同钙、磷水平对番茄光合作用和防御酶活性的影响,探明适宜番茄生长及增强抗病性的最佳钙、磷含量水平。结果表明:适宜磷肥能够提高番茄叶片光合色素含量。同一钙水平下中等磷水平(P2)的番茄叶片净光合速率(Pn)、蒸腾速率(Tr)最高。适当增施钙肥有利于番茄光合作用提高,中等施钙水平(Ca2)下中等施磷水平(P2),能够有效地改善番茄的光合性能,提高其光能利用率。番茄叶片防御酶CAT、PAL、POD、PPO活性均在中、高钙水平下较高;相同钙施用量条件下,中低磷水平番茄防御酶活性较高。

With ‘Liaoyuanduoli＇ tomato as material,two elements including calcium supply （three levels） and phosphorus （three levels） were conducted to study the interaction effects of calcium and phosphorus on photosynthesis and defense enzyme activity of tomato, in order to reveal the regulating effects of and phosphorus under different conditions on photosynthesis and defense enzyme activity and elucidate the feasible combination of and phosphorus for better growth of tomato. The results showed that appropriate phosphate fertilizer could improve the leaf photosynthetic pigment of tomato. The net photosynthetic rate （Pn） and transpiration rate （Tr） of tomato leaf was the highest in the same calcium level medium phosphorus levels （P2）. Ca2P2 treatment could effectively improve tomato photosynthetic capability. The results showed that there was a positive correlation between calcium and photosynthesis. Tomato leaf defense enzyme CAT, PAL and POD,PPO activity were higher in high calcium level;the same seems calcium conditions,low phosphorus level tomato defense enzyme activity was higher.