不同体色生物型烟蚜的取食特性分析

为探究不同体色生物型烟蚜Myzus persicae取食行为的差异,明确其在烟田的分布特征,利用刺探电位图谱(EPG)技术测定了红色型、绿色型和褐色型3种体色生物型烟蚜在烟草上的取食行为。结果表明:红色型烟蚜刺探取食之前对烟草寄主所花费的识别时间最短,为2.20 min,极显著短于褐色型烟蚜的10.09 min。绿色型烟蚜在刺探过程中pd波平均持续时间为7.45 s,显著长于红色型烟蚜的6.85 s,极显著长于褐色型烟蚜的3.95 s,但3种体色生物型烟蚜的pd波次数无显著差异。首次刺吸至第1次出现E2波所需时间,绿色型和褐色型烟蚜均约为红色型烟蚜的2倍。韧皮部取食阶段,3种体色生物型烟蚜分泌唾液(E1波)的时间无显著差异;红色型烟蚜被动吸食汁液(E2波)时间为112.28 min,显著长于绿色型烟蚜的70.02 min和褐色型烟蚜的75.15 min。褐色型烟蚜在木质部主动摄取汁液(G波)的时间最短为8.58 min,与另外2种体色生物型烟蚜差异显著。表明3种体色生物型烟蚜各自具有不同的取食策略,但总体而言红色型烟蚜对烟草的适应性最强。

EPG analysis of feeding behavior of green peach aphid Myzus persicae biotypes with different body colors

To explore the differences of feeding behavior and spatial distribution characteristics among three body-color biotypes of green peach aphid Myzus persicae (Sulzer) (Hemiptera:Aphididae), the stylet penetration activities of the red, green and pitchy biotypes were recorded by using electrical penetration graph (EPG) technique in the laboratory. The results showed that the initial probing of the red biotype on tobacco was the earliest with 2.20 min, while the pitchy was the latest with 10.09 min. The mean duration of pd of the green biotype was 7.45 s, significantly longer than those of the other two biotypes. There were no significant differences in the count of pd among three body-color biotypes. The time spent from first probe to first E2 between the green and pitchy biotypes was both almost double of the red ones. On the phloem phase, there were no differences in the number of E1 among three biotypes, while the duration of passive ingestion (E2 waveform) of the red biotype was 112.28 min, significantly longer than those of the green and pitchy ones with 70.02 min and 75.15 min. Compared to the other biotype aphids, the time of the pitchy biotype for actively sucking the juices (G waveform) at xylem was the shortest with 8.58 min, significantly shorter than those of red and green biotypes. The results indicated that each of the three biotypes of aphid species had different feeding strategies, and the red biotype had the best fitness on tobacco.