The potential of hydroxamic acids in tetraploid and hexaploid wheat varieties as resistance factors against the bird-cherry oat aphid, Rhopalosiphum padi
The potential of hydroxamic acids in tetraploid and hexaploid wheat varieties as resistance factors against the bird-cherry oat aphid, Rhopalosiphum padi
复制标题
DOI：
10.1111/aab.12005
复制
发表时间：
2013-01-01
影响因子：
2.6
通讯作者：
Werner, C. P.
中科院分区：
文献类型：
--
作者：
Elek, H.;Smart, L.;Werner, C. P.
研究了利用小麦天然抗性来控制谷物蚜虫（英国小粒谷物中最重要的蚜虫害虫）的潜力，作为使用杀虫剂的替代方法。研究重点是一组次生代谢物，异羟肟酸或苯并恶嗪酮，它们天然以糖苷形式存在，但在组织损伤时水解，产生具有生物活性的苷元，例如糖苷配基。 g。 2,4-二羟基-7-甲氧基-1,4-苯并恶嗪-3-酮 (DIMBOA) 与天然植物防御相关。这些对于一系列栽培单子叶植物对昆虫、真菌、细菌和线虫的抵抗力非常重要，并且最终可以与其他防御机制相结合，以提供控制谷类蚜虫的通用方法。在六倍体（Triticum aestivum）和四倍体（Triticum durum）小麦品种中测定了异羟肟酸，特别是 DIMBOA-葡萄糖苷的水平，并发现了物种和品种之间的差异。还研究了稻田的取食对叶组织中异羟肟酸水平的影响。因此，在蚜虫取食 24 小时后，由于叶子中明显的局部水解防御反应，丁波阿-葡萄糖苷的水平显着下降。当用含有低剂量 DIMBOA 的蔗糖溶液喂养蚜虫时，与蔗糖对照相比，蚜虫的死亡率显着增加。然而，所调查的小麦品种中异羟肟酸的水平和变化不足以使蚜虫的行为和发育产生显着差异。
The potential for exploiting natural wheat resistance to control the cereal aphid Rhopalosiphum padi, the most important aphid pest of small grain cereals in the UK, was investigated as an alternative approach to the use of insecticides. The investigation focussed on a group of secondary metabolites, the hydroxamic acids or benzoxazinones, present naturally as glucosides, but which hydrolyse on tissue damage to give biologically active aglycones, e. g. 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) which are associated with natural plant defence. These can be important for resistance against insects, fungi, bacteria and nematodes for a range of cultivated monocotyledonous plants and could ultimately be combined with other defence mechanisms to provide a general approach to cereal aphid control. Levels of hydroxamic acids, particularly DIMBOA-glucoside, were determined in hexaploid (Triticum aestivum) and tetraploid (Triticum durum) wheat varieties and differences were found between species and varieties. The effect of feeding by R. padi on the level of hydroxamic acids in the leaf tissue was also investigated. Thus, after 24 h of aphid feeding, as an apparently localised hydrolytic defence reaction in the leaf, levels of DIMBOA-glucoside decreased noticeably. When aphids were fed on sucrose solution containing low doses of DIMBOA there was a significant mortality compared to the sucrose control. However, the levels of and variation in hydroxamic acids in the wheat varieties investigated were insufficient for significant differences in aphid behaviour and development.