Positive effects of an arbuscular mycorrhizal fungus on aphid life history traits
Positive effects of an arbuscular mycorrhizal fungus on aphid life history traits
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DOI：
10.1007/s004420050840
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发表时间：
1999-07-01
期刊：
影响因子：
2.7
通讯作者：
Brown, VK
中科院分区：
文献类型：
--
作者：
Gange, AC;Bower, E;Brown, VK
两种蚜虫（Myzus ascalonicus和M. persicae）在有和没有丛枝菌根真菌根内球囊霉（Glomus intraradices）的根定殖的披针叶车前（Plantago lanceolata）植物上饲养。测定的生活史性状包括若虫发育时间、成蚜体重、生长速率、总产卵量、成蚜寿命和繁殖后生活期。对于两个世代的两种蚜虫，菌根定殖增加了蚜虫的重量和繁殖力，而其他性状不受影响。这些增长在各代之间是一致的。在第二个实验中，M.在不同的N和P制度下，在有和没有真菌的植物上饲养桃蚜。由于蚜虫死亡率高，因此，氮添加的结果是不确定的。在低磷和中磷水平下，菌根对蚜虫生长有促进作用，而在高磷水平下，这种作用消失。这里报道的菌根定植的积极影响与大多数以前的咀嚼昆虫研究相反，这些研究报道了负面影响。一些可能的机制，这种明显的差异进行了讨论。
Two generations of two aphid species (Myzus ascalonicus and M. persicae) were reared on Plantago lanceolata plants, with and without root colonization by the arbuscular mycorrhizal fungus, Glomus intraradices. Life history traits of the aphids measured were nymphal development time, teneral adult weight, growth rate, total fecundity, adult longevity and duration of postreproductive life. For both aphids in both generations, mycorrhizal colonization increased aphid weight and fecundity, while other traits were unaffected. The increases were consistent between generations. In a second experiment, M. persicae was reared on plants with and without the fungus, under varying N and P regimes. The results of N addition were inconclusive because there was high aphid mortality. However, under P supplementation, positive effects of the mycorrhiza on aphid growth were seen at low and medium P levels, while at high P levels these effects disappeared. The positive effects of mycorrhizal colonization reported here are contrary to the majority of previous studies with chewing insects, which have reported negative effects. A number of possible mechanisms for this apparent discrepancy are discussed.