PDF(Pubmed)
Abstract：
The cabbage aphid, Brevicoryne brassicae L. (Hemiptera: Aphididae), is one of the important pests of cruciferous plants throughout the world including Iran. In the present study, we grew cultivated canola plants under different fertilizers or distilled water and sprayed them with 100 µM abscisic acid (ABA) or a control solution (NaOH dissolved in water) to study (i) the antibiosis parameters of B. brassicae on these plants; (ii) the antixenosis of B. brassicae adults on these plants; (iii) the plant\'s peroxidase (POD), polyphenol oxidase (PPO), and phenylalanine ammonia-lyase (PAL) activity; and (iv) the plant\'s total phenolic and glucosinolate content. The results of antibiosis experiments showed that ABA and fertilizers have a profound and negative effect on the performance of B. brassicae. In the antixenosis experiment, control plants attracted a significantly higher number of adult females in comparison to treated plants. Also, B. brassicae had lower performance and preference when they were reared on the ABA-treated fertilized plants with higher levels of phenolic and glucosinolate content. These results prompted us to hypothesize that fertilizers enable canola plants to trigger a higher level of secondary metabolites. Our findings reveal that the type and level of nutrient availability may have different impacts on how the plant regulates its defense mechanisms.
摘要：
卷心菜蚜虫,十字花科（半翅目：蚜科），是包括伊朗在内的世界各地的十字花科植物的重要害虫之一。在本研究中,我们在不同的肥料或蒸馏水下种植栽培的油菜植物，并用100µM脱落酸（ABA）或对照溶液（溶解在水中的NaOH）喷洒它们，以研究（i）十字花科对这些植物的抗菌参数；（ii）十字花科成虫在这些植物上的抗生；（iii）植物的过氧化物酶（POD），多酚氧化酶(PPO),和苯丙氨酸解氨酶（PAL）活性；（iv）植物的总酚和芥子油苷含量。抗菌实验结果表明，ABA和肥料对油菜的生产性能具有深远的负面影响。在抗异种病实验中，与处理过的植物相比，对照植物吸引了更多的成年雌性。此外，当在具有较高水平的酚类和芥子油苷含量的ABA处理过的施肥植物上饲养时，油菜芽孢杆菌的性能和偏好较低。这些结果促使我们假设肥料使油菜植物能够触发更高水平的次生代谢产物。我们的发现表明，养分利用率的类型和水平可能对植物如何调节其防御机制产生不同的影响。
