Aphid DNA detection by molecular gut content analysis in a natural enemy consuming honeydew

Aphid DNA detection by molecular gut content analysis in a natural enemy consuming honeydew
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通过分子肠道内容分析检测食用蜜露的天敌中的蚜虫 DNA

DOI:
10.1111/jen.13041
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发表时间:
2022
影响因子:
1.9
通讯作者:
Hayashi Masayuki
Hayashi Masayuki
中科院分区:
农林科学3区
文献类型:
--
作者:
Owashi Yuta;Hayashi Masayuki

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在农业生态系统中,了解捕食者-猎物相互作用是利用害虫天敌的先决条件。使用猎物特异性引物进行聚合酶链反应(PCR)的分子肠道内容物分析已被广泛开发,以识别害虫的主要天敌。然而,这些技术可能包括不确定性:所研究的生物体和害虫之间的捕食以外的相互作用可能导致在假定的捕食者的肠道中检测到害虫DNA。在这里,我们测试了蚜虫的DNA是否可以在它们的蜜露中检测到,以及在食用蜜露但从未接触过蚜虫的天敌的肠道内容物样品中检测到。我们使用棉蚜,棉蚜(半翅目:蚜科),和幼虫的绿色lacewingMallada desjardinsi(脉翅目:蚜虫科),捕食蚜虫和吸蜜露。通过使用蚜虫特异性引物,我们检测到79.2%的蜜露样品检测蚜虫DNA阳性。在草蛉幼虫和蚜虫之间没有直接接触的情况下,在36.7%的草蛉幼虫中检测到蚜虫DNA。因此,通过基于DNA的肠道内容物分析来评估蚜虫捕食,存在确定节肢动物捕食蚜虫的风险,而事实上,它没有。我们认为,PCR结果应谨慎解释时,估计捕食。
In agroecosystems, understanding of predator–prey interactions are a prerequisite for the use of natural enemies of pest arthropods. Molecular gut content analyses using prey‐specific primers for polymerase chain reaction (PCR) have been widely developed to identify the essential natural enemies of pests. However, these techniques may include uncertainties: interactions other than predation between the studied organisms and pests could result in the detection of the pest DNA in the gut of a supposed predator. Here, we tested whether the DNA of aphids was detectable in their honeydew and in gut content samples of a natural enemy that had consumed honeydew but had never contacted the aphids. We used the cotton aphid,Aphis gossypii(Hemiptera: Aphididae), and larvae of the green lacewingMallada desjardinsi(Neuroptera: Chrysopidae) that prey on aphids and suck honeydew. By using specific primers for the aphid, we detected that 79.2% of honeydew samples tested positive for the aphid DNA. Aphid DNA was detected in 36.7% of lacewing larvae that had consumed honeydew, in the absence of direct contact between lacewing larvae and aphids. Evaluation of aphid predation by DNA‐based gut content analysis, therefore, carries the risk of determining that an arthropod has preyed on aphids when, in fact, it has not. We believe that PCR results should be interpreted with caution when estimating predation.
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