Xue Ming, Wang Cheng-Xiang, Bi Ming-Juan, Li Qing-Liang, Liu Tong-Xian
College of Plant Protection, Shandong Agricultural University, Taian, Shandong, China.
Environ Entomol. 2010 Jun;39(3):883-91. doi: 10.1603/EN09307.
Myzus persicae and Bemisia tabaci are serious pests of tobacco and can occur simultaneously on the same plant. We found that tobacco plants infested by whiteflies had fewer aphids than those without whiteflies. To determine whether B. tabaci feeding could induce plant defense against aphids locally and systemically, we determined the effects of B. tabaci on several biological parameters of M. persicae on tobacco. Infestation of B. tabaci nymphs reduced survival rates of M. persicae by 30.0%. In three generations, M. persicae populations increased 1,091-fold on uninfested plants compared with 222-fold on the plants with whiteflies. On the upper leaves with systemic damage but uninfested B. tabaci, the survival rate of aphids was 9.3-fold lower than that on plants that were never been infested by whitefly. Survival rates of M. persicae on leaves with whiteflies present or with whiteflies removed were also lower than those on uninfested leaves. Fecundity of M. persicae was not different on leaves with whiteflies, with whiteflies removed or uninfested leaves; however, fecundity on leaves with systemic damage was lower than on uninfested leaves. Growth rates of M. persicae on the leaves with whiteflies, or with whiteflies removed, were higher than on uninfested leaves, whereas it was lower on systemically damaged leaves than on uninfested leaves. The development of M. persicae was approximately 1 d longer on systemic leaves with whiteflies than on uninfested leaves. These results indicate that feeding of B. tabaci induced a defense in tobacco plants against M. persicae, both locally and systemically, although other mechanisms may also be involved.
烟蚜和烟粉虱是烟草的主要害虫，可同时出现在同一植株上。我们发现，被粉虱侵染的烟草植株上的蚜虫比未被粉虱侵染的植株上的蚜虫少。为了确定烟粉虱取食是否能诱导植物对蚜虫产生局部和系统防御，我们测定了烟粉虱对烟草上烟蚜若干生物学参数的影响。烟粉虱若虫的侵染使烟蚜的存活率降低了30.0%。在三代时间里，未受侵染的植株上烟蚜种群数量增加了1091倍，而有粉虱的植株上烟蚜种群数量增加了222倍。在有系统损伤但未受烟粉虱侵染的上部叶片上，蚜虫的存活率比从未受粉虱侵染的植株上低9.3倍。有粉虱或粉虱已去除的叶片上烟蚜的存活率也低于未受侵染的叶片。有粉虱、粉虱已去除或未受侵染的叶片上烟蚜的繁殖力没有差异；然而，有系统损伤的叶片上烟蚜的繁殖力低于未受侵染的叶片。有粉虱或粉虱已去除的叶片上烟蚜的生长速率高于未受侵染的叶片，而有系统损伤的叶片上烟蚜的生长速率低于未受侵染的叶片。有粉虱的系统叶片上烟蚜的发育时间比未受侵染的叶片上大约长1天。这些结果表明，烟粉虱的取食诱导了烟草植株对烟蚜的局部和系统防御，尽管可能还涉及其他机制。
