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中文摘要：
应用刺探电位图谱（EPG）技术对禾谷缢管蚜Rhopalosiphumpadi在不同小麦品种（Ww2730、小偃22和Batis）苗期的取食行为进行了比较研究。结果表明：在小偃22上蚜虫开始取食的第1次刺探时间最晚,且持续时间最短;在Ww2730上取食受到机械阻力的个体最多,且出现F波的几率和持续时间最长;两品种上蚜虫在木质部主动摄取汁液（G波）花费的时间最长。在Batis上,蚜虫口针第1次到达韧皮部时需要分泌较多水溶性唾液（E1波）,但随后只需分泌较少的水溶性唾液就可以成功取食,而且被动吸食韧皮部汁液的时间（E2波）最长。蚜虫口针在到达小偃22韧皮部取食之前,出现多次的口针试探、回撤,并且多次、多量分泌水溶性唾液（E1波）;虽然蚜虫在小偃22上口针最先到达韧皮部,但被动吸食韧皮部汁液的时间（E2波）最短。由此得出结论：小偃22表皮部、韧皮部存在阻碍禾谷缢管蚜取食的物理和生化因素;禾谷缢管蚜在Ww2730取食遇到更多的是细胞间机械阻力;Batis是较感蚜的品种。
英文摘要：
To elucidate aphid resistance mechanisms in three wheat cuhivars Ww2730, Xiaoyan22 and Batis, Rhopalosiphum padi L. （Homoptera： Aphididae ） feeding behavior was examined using the electrical penetration graph （EPG） technique. The results showed that the initial probing of R. padi on Xiaoyan22 occurred the latest and probing duration was also the shortest among the three cuhivars examined. Highest frequency and longest duration of intercellular piercing （F waveform） of R. padi feeding was recorded on Ww2730. R. padi spent significantly more time feeding on mesophyll tissue to ingest actively （G waveform） on the both Ww2730 and Xiaoyan22 when compared with Batis. R. padi ingested from phloem of Batis with much more watery salivation and less excretion （El waveform）, and ingested passively （E2 waveform） for the longest duration among all three cuhivars examined. In contrast, before initiating ingestion on Xiaoyan22, aphids probed, withdrew uninterruptedly and with extended watery salivation （E1 waveform）, the duration of passive ingestion （E2 wave） was also the shortest, although their stylets reached to phloem the earliest. We concluded that Ww2730 and Xiaoyan 22 were resistant to R. padi feeding, while Batis was susceptible to R. padi feeding. It was inferred that physical and biochemical factors in plant tissues （e. g., epidermis, mesophyll and phloem） prevented R. padi from feeding on Xiaoyan22, mechanical restriction between the cells restricted R. padi to feed on Ww2730, while Batis is a susceptible variety to R. padi.
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