Change in acceptability of barley plants to aphids after exposure to allelochemicals from couch-grass (Elytrigia repens)
Change in acceptability of barley plants to aphids after exposure to allelochemicals from couch-grass (Elytrigia repens)
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DOI：
10.1023/a:1022687025416
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发表时间：
2003-02-01
影响因子：
2.3
通讯作者：
Pickett, J
中科院分区：
文献类型：
--
作者：
Glinwood, R;Pettersson, J;Pickett, J
研究了鸟型樱桃燕麦蚜虫（Rhopalosiphum padi）对大麦植株的抗性反应，并将大麦植株暴露于具有侵略性的杂草elypyron repens的根系等位基因化学物质中。植物用活的长沙草植物的根渗出液或先前鉴定的长沙草根化合物[5-羟基吲哚-3-乙酸，dl -5-羟色氨酸，l -5-羟色氨酸水合物和6-羟基-1,2,3,4-四氢- β -羰基-3-羧酸（羰基）]单独或混合处理。在选择沉降和不选择沉降试验中，大麦植物对蚜虫的接受程度在根渗出液处理后显著降低，在单独或与其他化合物联合测试时，碳碱的接受程度也显著降低。相比之下，不含碳碱的其他化合物在降低蚜虫接受度方面的活性较低。在探索性生物测定中，个别物质对蚜虫要么是中性的，要么是刺激性的，这表明沉淀的减少可能不是由于对蚜虫的直接影响，而是由于对植物的影响。这在嗅觉分析中得到了证实，在用含有所有四种化学物质的混合物处理后，蚜虫被大麦植物的气味所排斥。
The response of the bird cherry-oat aphid, Rhopalosiphum padi, to barley plants was investigated following exposure of the plants to root allelo-chemicals from the aggressive weed couch-grass, Elytrigia (Agropyron) repens. Plants were treated either with root exudates from living couch-grass plants or with previously identified couch-grass root compounds [5-hydroxyindole-3-acetic acid, DL-5-hydroxytryptophan, L-5-hydroxytryptophan hydrate, and 6-hydroxy-1,2,3,4-tetrahydro-beta-carboline-3-carboxylic acid (carboline)] either separately or in mixtures. In choice and no-choice settling tests, aphid acceptance of barley plants was significantly reduced following treatment with root exudates, and the carboline when tested alone or in combination with the other compounds. In contrast, the other compounds without the carboline were less active in reducing aphid acceptance. In a probing bioassay, individual substances were either neutral or stimulatory to aphids, indicating that the reduced settling was probably not due to direct effects on aphids, but rather due to effects on the plant. This was confirmed in olfactometer assays, in which aphids were repelled by odors from barley plants following treatment with a mixture containing all four chemicals.