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Yang S.K.,Environment Friendly Agriculture Research Institute | Seo Y.W.,Environment Friendly Agriculture Research Institute | Choi K.J.,Environment Friendly Agriculture Research Institute | Kwak Y.-S.,Gyeongsang National University
World Journal of Microbiology and Biotechnology | Year: 2012

The present study evaluated the changes of soil microbial communities that were subjected to no-till and compared the results to those subject to tillage for organic farming in a controlled horticultural field by fatty acid methyl ester. Fungi (P & 0. 001), gram-positive bacteria (P & 0. 001), arbuscular mycorrhizal fungi (P & 0. 01), and actinomycetes (P & 0. 01) in the no-till soils were significantly larger than those in the tillage soils. The no-till in the subsoil had a significantly lower ratio of cy17:0 to 16:1ω7c compared to that of tillage, indicating that microbial stress decreased because the soils were not disturbed (P & 0. 05). Fungi should be considered as a potential factor responsible for the obvious microbial community differentiation that was observed between the no-till and tillage areas in a controlled horticultural field. © 2011 Springer Science+Business Media B.V. Source


Koo H.-N.,Chungbuk National University | Yoon S.-H.,Chungbuk National University | Shin Y.-H.,Chungbuk National University | Yoon C.,Chungbuk National University | And 2 more authors.
Journal of Asia-Pacific Entomology | Year: 2011

The effect of electron beam irradiation on each developmental stage of diamondback moth, Plutella xylostella L. (Lepidoptera: Plutellidae), was examined. Eggs, larvae, pupae, and adults were irradiated at target doses of 30, 50, or 100. Gy or they were left untreated as controls in replicated experiments. When eggs and pupae were irradiated with 100. Gy, emergence rates greatly decreased and, although some adults laid eggs, they did not hatch. Egg hatching of irradiated larvae and adult decreased with increasing irradiation doses. However, electron beam irradiation did not kill P. xylostella directly. Adult longevity was not affected. Reciprocal crosses between irradiated and unirradiated moths demonstrated that females were more radiosensitive than males in hatchability; however, the difference was not significant. In addition, electron beam-irradiated larvae showed typical DNA fragmentation in a dose-dependent manner compared with cells from unirradiated larvae. Our findings suggest that electron beam irradiation induces abnormal development and reproduction of P. xylostella; therefore, it may contribute to effective disinfestation and quarantine treatments of P. xylostella. © 2011. Source

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