Population dynamics,hunting nature on insect pests and existence of symbiotic bacterial microbes among leading transgenic cotton spiders |
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Authors: | Muhammad Nasir Chen-chen Zhao Jun-yu Luo Xiang-zhen Zhu Xue-ke Gao Mazher F Iqbal Ji-chao Ji Shuai Zhang Jin-jie Cui |
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Institution: | 1. Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang 455000, China;2. Ayub Agricultural Research Institute, Faisalabad 38000, Pakistan;3. Liaoning Key Laboratory for Biological Invasion and Global Changes, Shenyang Agriculture University, Shenyang 110866, Liaoning, China;4. College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China |
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Abstract: | The genetically modified cotton holding Bt proteins, is noxious to bollworms larvae but very little is known about its impact on population of non-target spiders within the field. Studies conducted with the aim to identify spiders along with their abundance, prevalence pattern, preying habit on insect pests in Bt cotton (L280, Cry2Ab4) and commonness of symbiotic bacteria in these spiders. Spiders collections were made via vial tapping/jarring, from May to end of October (2018). In total, 13,342 spiders were recorded during the entire cropping season. Least relative abundance was in May (0.28%), highest in August (30.39%) while ahead decline was observed, reached to 12% in October. The 27 species were verified, least richness was in May (3 species), high in August (19 species), later in the end, reduced to 7 species. High abundance was of Hylyphantes graminicola (68.56%) and Neoscona theisi (19.98%). Existence of H. graminicola and Pardosa astrigera observed during the whole cropping season. Presence of seven guilds among spiders had a diverse nature of hunting insect pests and on number of species existed in the crop, maximum was from direct hunting habit. Composition and community structure of microbiota varied as of spider species. Proteobacteria was the most abundant bacterial phylum and topmost genus was Wolbachia in observed spiders. Five groups of bacteria distinguished across 4 clusters of spiders depending on core community of symbiotic bacterial genera. This effort is an initial step to get knowhow about spiders in Bt cotton, which will facilitate future research studies concerning spiders. |
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Keywords: | Genetically modified crops Predaceous organisms Spiders Bacterial symbionts |
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