麦长管蚜在高CO2浓度下生长的抗性与感性小麦品种上的取食行为

在加倍CO2浓度(0.7 mL/L)的人工气候箱中培养小麦感蚜品种(铭贤169)和抗蚜品种(KOK1679)幼苗30d,正常CO2浓度(0.35 mL/L)处理为对照.应用刺探电位图谱(EPG)技术对麦长管蚜Sitobion avenae (Fab.),在苗期小麦上的取食行为进行了比较研究.结果表明:蚜虫在加倍CO2浓度下生长的2个小麦品种上的取食过程中,电势降落次数(pd波个数)显著增加,刺探总时间(C波总时间)显著延长,首次出现在小麦韧皮部取食的时间(E2)显著滞后,被动取食持续时间(E2波的总时间)显著拉长.因此,加倍CO2浓度可能通过影响小麦而对麦长管蚜的取食行为产生了明显的间接影响.

Electrical penetration graph (EPG) of feeding behavior of Sitobion avenae (Fab.) on resistant and susceptible wheat plants grown under elevated

Two wheat varieties, MY169 (susceptible) and KOK1679 (resistant) were planted in controlled chambers under elevated CO2 (0.7 mL/L) and ambient CO2 concentrations (0.35 mL/L, as control) conditions for 30 d. Feeding behaviors of wheat aphids, Sitobion avenae (Fabricius), on seedling plants were observed and recorded with electrical penetration graph (EPG). Increased number of potential drop waveform (pd waveform), prolonged total time of mechanical stylet penetration (total time of C waveform), delayed initial time of 1st probing from phloem (time to 1st E2 waveform) and extended sustaining time of passive ingestion were observed in S. avenae fed on wheat plants grown under elevated CO2 than that under ambient CO2 condition. The change of feeding behavior of wheat aphids was probably resulted from the change of host plants grown under elevated CO2 concentration condition.