共生菌对麦长管蚜生长发育和繁殖的影响

Effects of bacterial symbionts on growth,development and fecundity of Sitobion avenae (F.) (Homoptera:Aphididae)

为了明确共生菌对麦长管蚜生长发育和繁殖的影响,用利福平处理得到脱共生麦长管蚜,在15,18,21,24和27℃条件下,对脱共生及共生麦长管蚜的生长发育和繁殖情况进行了观察和统计分析。结果表明,脱共生麦长管蚜质量极显著低于共生麦长管蚜;在不同温度下,共生麦长管蚜与脱共生麦长管蚜都表现为,随温度的升高全若虫期的发育历期缩短,但在同一温度下,脱共生麦长管蚜的发育历期极显著高于共生麦长管蚜;脱共生麦长管蚜全若虫期的有效积温高于共生麦长管蚜,而发育起点温度低于共生麦长管蚜;脱共生麦长管蚜和共生麦长管蚜均在21℃时达到最大生殖力;在同一温度下,脱共生麦长管蚜的平均世代周期均大于共生麦长管蚜,净增值率、内禀增长率均远远低于共生麦长管蚜。据此认为,共生菌对麦长管蚜的生长发育和繁殖均有重要影响。

To explore the effect of bacterial symbionts on the growth, development and fecundity of Sitobin avenae （F.）. The aphids were treated with the antibiotic and rifampicin to eliminate their intracellular symbiotic bacteria. At five different tempetures of 15,18,21,24,27 ℃, the diffrence between Aposymbiotic and symbiotic Sitobin avenae （F.） were studied. The influences of bacterial symbionts on Sitobion avenae （F.）＇s growth,development and fecundity were also studied. The result showed that bacteria-free aposymbiotic aphids exhibited a reduced adult fresh weight.at different tempetures,bacteria-free aposymbi-otic aphids exhibited an increased nymph duration. threshold temperature bacteria-free aposymbiotic aphids was lower than symbiotic aphids, but effectively accumulated temperature（EAT） of aposymbiotic aphids nymph duration was higher than symbiotic aphids ; both Bacteria-free aposymbiotic aphids and symbiotic aphids,reached the top of its productivity at 21 ℃ ,but at the same temperature,a generation length of bacteria-free aposymbiotic aphids was longer than symbiotic aphids,and productivity of bacteria-free aposymbiotic aphids was far lower than symbiotic aphids.