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- 저자 : De-Fu CHI (검색결과 3 건)
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Ultrastructural observations of Beauveria bassiana infection in Xylotrechus rusticus larvae
Jun‐Nan Ding,De-Fu CHI 한국곤충학회 2018 Entomological Research Vol.48 No.3
In the present study we investigated the infection process of Beauveria bassiana on Xylotrechus rusticus larvae using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The SEM results showed that B. bassiana spores germinated on the surface of the larval body and invaded the larva as an appressorium. The hyphae then germinated from the spores and spread throughout the larval body. After the death of the larva, conidiophores formed at one end of the hypha on the surface of the larval body and prepared for a new round of infection. The TEM results showed severe damage to the larval cuticle after hyphae infection. The structure of the cuticle became thinner and eventually flocculent; muscle tissues were dissociated and eventually stuck to the hyphae, and the corpus adiposum was loose and deformed, and eventually degraded.
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Pathological Impact on the Phyllosphere Microbiota of Artemisia argyi by Haze
( Yu-zhu Zhang ),( De-yu Jiang ),( Chi Zhang ),( Kun Yang ),( Huai-fu Wang ),( Xiu-wen Xia ),( Wei-jun Ding ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.4
The pathological impact of haze upon the phyllosphere microbiota awaits investigation. A moderate degree of haze environment and a clean control were selected in Chengdu, China. Artemisia argyi, a ubiquitously distributed and extensively applied Chinese herb, was also chosen for experiment. Total genome DNA was extracted from leaf samples, and for metagenome sequencing, an Illumina HiSeq 2500 platform was applied. The results showed that the gene numbers of phyllosphere microbiota derived from haze leaves were lower than those of the clean control. The phyllosphere microbiota derived from both haze and clean groups shared the same top ten phyla; the abundances of Proteobacteria, Actinomycetes and Anorthococcuso of the haze group were substantially increased, while Ascomycetes and Basidiomycetes decreased. At the genus level, the abundances of Nocardia, Paracoccus, Marmoricola and Knoelia from haze leaves were markedly increased, while the yeasts were statistically decreased. KEGG retrieval demonstrated that the functional genes were most annotated to metabolism. An interesting find of this work is that the phyllosphere microbiota responsible for the synthesis of primary and secondary metabolites in A. argyi were significantly increased under a haze environment. Relatively enriched genes annotated by eggNOG belong to replication, recombination and repair, and genes classified into the glycoside hydrolase and glycosyltransferase enzymes were significantly increased. In summary, we found that both structure and function of phyllosphere microbiota are globally impacted by haze, while primary and secondary metabolites responsible for haze tolerance were considerably increased. These results suggest an adaptive strategy of plants for tolerating and confronting haze damage.
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Yan-chen Wang,Peng Li, De-fu Chi 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.2
To utilize plant volatiles in themonitoring and biological control of Tenebrio molitor L., electroantennogramography (EAG), Y-tube olfactometry and wind tunnel bioassays were conducted to test the electrophysiological and behavioral responses of T. molitor to nine individual volatiles and five essential oils (compounded volatiles). The aim of this studywas to select effective plant compounds that could be used in the development of semi-chemical based push– pullmethods for the control of this harmful stored product pest. T. molitor displayed strong EAG responses to cis-3- hexenol, isoeugenol, α-pinene, turpentine oil, eucalyptus oil and peppermint essential oil. Y-tube olfactometry assays indicated that peppermint essential oil showed greater luring effects on adult T. molitor than the control. Cis- 3-hexenol elicited strong repellent effects on adult T. molitor, and wind tunnel assays indicated that cis-3-hexenol showed strong repellent effects on adult T. molitor. Peppermint essential oil showed greater luring effects than the control. These results provide a basis to further the development of T. molitor luring and repellent agents.
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