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通过用不同浓度的 NO3- 、 Ca2 + 营养液对香石竹施肥 ,并对香石竹进行叶斑病接种 ,结果表明 :营养液中 NO3-浓度在 2 40～ 2 5 0 mg/ kg,Ca2 +浓度在 2 2 0～ 3 42 mg/ kg范围内 ,有利于香石竹叶片钙含量的提高和 PPO、 POD活性保持较高水平 ,能增强植株自身对病原菌的抵抗能力 ,减轻褐斑病的发病程度。叶钙含量与PPO、POD活性呈极显著正相关 (r PPO* * =0 .92 4,r POD* * =0 .93 8) ,营养液 NO3-浓度与叶钙含量呈负相关 r=-0 .1 2 2 )。
The results showed that the concentration of NO3- and Ca2 + in the nutrient solution was 240 ~ 250 mg / kg, Ca2 + concentration In the range of 2 2 0 ~ 3 42 mg / kg, the increase of calcium content and the activity of PPO and POD in the leaves of Carnation increased, which enhanced the resistance of the plants to pathogenic bacteria and reduced the incidence of brown spot. There was a significant positive correlation between leaf calcium content and PPO and POD activity (r PPO * * = 0.92 4, r POD * * = 0.93 8). The concentration of NO3- in nutrient solution was negatively correlated with leaf calcium content (r = 0 .1 2 2).