alexa Insights Into Adaptations To A Near-obligate Nematode Endoparasitic Lifestyle From The Finished Genome Of Drechmeria Coniospora
ISSN: 2471-9315

Applied Microbiology: Open Access
Open Access

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12th International Congress on Microbial Interaction and Applications of Beneficial Microbes
July 17-18, 2017 Munich, Germany

Liwen Zhang, Zhengfu Zhou, Qiannan Guo, Istvan Molnar, Min Lin and Yuquan Xu
Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, China
University of Arizona, USA
Posters & Accepted Abstracts: Appli Micro Open Access
DOI: 10.4172/2471-9315-C1-006
Abstract
Although annual crop losses due to plant-parasitic nematodes are estimated at a staggering $157 billion worldwide, options for nematode pest management are very limited due to environmental safety concerns. This situation demands further research to discover effective and environmentally responsible alternatives to replace legislatively withdrawn nematicides. Biological control agents, such as nematophagous fungi, may be part of the answer when applied in the context of integrated pest management systems. Thus, understanding the mechanisms governing the interactions between nematophagous fungi and their nematode prey, and biocontrol strategies based on these interactions are key issues for crop protection. Nematophagous fungi employ three distinct predatory strategies: nematode trapping, parasitism of females and eggs, and endoparasitism. While endoparasites play key roles in controlling nematode populations in nature, their application for integrated pest management is hindered by the limited understanding of their biology. We present a comparative analysis of a high quality finished genome assembly of Drechmeria coniospora, a model endoparasitic nematophagous fungus, integrated with a transcriptomic study. Adaptation of D. coniospora to its almost completely obligate endoparasitic lifestyle led to the simplification of many orthologous gene families involved in the saprophytic trophic mode, while maintaining orthologs of most known fungal pathogen-host interaction proteins, stress response circuits and putative effectors of the small secreted protein type. The need to adhere to and penetrate the host cuticle led to a selective radiation of surface proteins and hydrolytic enzymes. Although the endoparasite has a simplified secondary metabolome, it produces a novel peptaibiotic family that shows antibacterial, antifungal and nematicidal activities. Our analyses emphasize the basic malleability of the D. coniospora genome: loss of genes advantageous for the saprophytic lifestyle; modulation of elements that its cohort species utilize for entomopathogenesis; and expansion of protein families necessary for the nematode endoparasitic lifestyle.
Biography

Liwen Zhang has completed her PhD from University of Georgia. She is currently an Assistant Professor in the Biotechnology Research Institute, Chinese Academy of Agricultural Sciences. She has published 5 papers as first author in reputed journals.

Email: [email protected]

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