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Effects of Bt rice expressing Cry1Ac on ecological functional guilds and community of non‐target insects
Author(s) -
Lee Sue Yeon
Publication year - 2021
Publication title -
entomological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 20
eISSN - 1748-5967
pISSN - 1738-2297
DOI - 10.1111/1748-5967.12515
Subject(s) - cnaphalocrocis medinalis , biology , cry1ac , predation , abundance (ecology) , herbivore , species richness , agronomy , community structure , japonica , lepidoptera genitalia , ecology , diversity index , omnivore , genetically modified crops , botany , transgene , biochemistry , gene
Abstract A 2‐year field study was conducted to assess the effects of a Bt‐rice line Cr7–1, (Japonica rice cultivar Nakdong) expressing a transgenic Cry1Ac1 gene, which is highly insecticidal against all larval stages of Cnaphalocrocis medinalis (Guenee) (Lepidoptera: Pyralidae), compared with an isogenic rice line (Japonica rice cultivar Nakdong). We investigated the community structure of insects with a sweep net and suction device in Bt and non‐Bt rice fields during the rice growing season in 2007 and 2008 in Chungcheongnam‐do, Korea. Two sampling methods, suction and sweeping, were used considering the habitat, behavior, and vertical distribution of insects in this study. A total of 43 families in 10 orders were identified from 64,099 collected insects and classified into four ecological functional guilds: (i) Herbivores; (ii) Predators; (iii) Parasitoids, and (iv) Detritivores, based on their ecosystem service. The temporal patterns of insect family richness, abundance, and Shannon's index were very similar between Bt and non‐Bt rice, although significant differences were observed on a few occasions. In ecological functional guilds, abundance of herbivores and predators were significantly different between Bt and non‐Bt rice, but there was no consistent trend in the 2 years. Overall, insect community structure, including diversity, abundance, and dominant families, was not significantly different between Bt and non‐Bt rice. The results indicated that the transgenic Cry1Ac rice assessed in this study had no adverse effects on the rice insect community structure and ecological functional guilds in rice fields.