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Exploring the region-wise diversity and functions of symbiotic bacteria in the gut system of wood-feeding termite,coptotermes formosanus,toward the degradation of cellulose,hemicellulose,and organic dyes

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Insect Science 2022年第5期29卷 1414-1432页

作者： Mudasir A.Dar Rongrong Xie Radhakrishna S.Pandit Blessing Danso Chenchen Dong Jianzhong Sun Biofuels Institute School of the Environment and Safety EngineeringJiangsu UniversityZhenjiangJiangsu ProvinceChina Department of Zoology Savitribai Phule Pune UniversityGaneshkhindPuneIndia

The wood-feeding termite coptotermes formosanus represents a unique and impressive system for lignocellulose degradation.The highly efficient digestion of lignocellulose is achieved through symbiosis with gut symbionts like bacteria.Despite extensive research during the last three decades,diversity of bacterial symbionts residing in individual gut regions of the termite and their associated functions is still lacking.To this end,cellulose,xylan,and dye-decolorization bacteria residing in foregut,midgut,and hindgut regions of C.formosanus were enlisted by using enrichment and culture-dependent molecular methods.A total of 87 bacterial strains were successfully isolated from different gut regions of C.formosanus which belonged to 27 different species of 10 genera,majorly affiliated with Proteobacteria(80%)and Firmicutes(18.3%).Among the gut regions,37.9%of the total bacterial isolates were observed in the hindgut that demonstrated predominance of cellulolytic bacteria(47.6%).The majority of the xylanolytic and dye-decolorization bacteria(50%)were obtained from the foregut and midgut,respectively.Actinobacteria represented by Dietza sp.was observed in the hindgut only.Based on species richness,the highest diversity was observed in midgut and hindgut regions each of which harbored seven unique bacterial species.The members of Enterobacter,Klebsiella,and Pseudomonas were common among the gut regions.The lignocellulolytic activities of the selected potential bacteria signpost their assistance to the host for lignocellulose digestion.The overall results indicate that C.formosanus harbors diverse communities of lignocellulolytic bacteria in different regions of the gut system.These observations will significantly advance our understanding of the termite–bacteria symbiosis and their microbial ecology uniquely existed in different gut regions of C.formosanus,which may further shed a light on its potential values at termite-modeled biotechnology.

关键词： bacterial symbionts coptotermes formosanus culture-dependent gut regions lignocellulose termite

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Attraction of Pine Trees to coptotermes formosanus Shiraki

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Plant Diseases and Pests 2016年第1期7卷 5-9,31页

作者： Liu Jimin Huang Qichun Jia Bao Wei Ge Tan Zhiquan Lu Wen Nanning Institute of Termites Control Nanning 530023China Institute of Economic Crops Guangxi Academy of Agricultural SciencesNanning 530007China General Plant Protection Station of Guangxi Nanning 530024China College of Agronomy Guangxi UniversityNanning 530005China

[ Objective] The paper aimed to find out attraction of different parts of pine trees, in order to screen more attractive baits. [ Method] The olfactory reponse and feeding preference of coptotermes formosanus to three kinds of pine trees and chemical compositions of various materials were studied systematically.[Result] Olfactory response of C. formosantts to Pinus massoniana, P. yunna^nsis and P. dliottii were observed at different parts. The feeding rotes of C. formoanus on xylem at the base of trunk and xylem at the top of trunk of P. elliottii were the highest of 22.277% and 33. 163%, respectively. The selectivity rate of olactory response of C. formosanus was associated with cellulose, protein, total sugar and amino acids contents of pine trees, while feeding rate had significantly posiire correlation with crude fiber content of pine trees. [ Conclusion] C. formosanus presents olfactory response to pine trees, which is associated with cellulose,orotein, oleoresin, total sugar and amino acid of materials. The preference of C. formosanus to pine trees is closely related to their crude fiber contents.

关键词： coptotermes formosanus Pine tree Attraction

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Evaluation of Tung Oil(Vernicia fordii(Hemsl.))for Controlling Termites

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Journal of Botanical Research 2022年第3期4卷 15-24页

作者： Hangtian Li Siying Li Hui Lu Jingjing Zhang Xi Yang Dayu Zhang Yike Zhang Yongjian Xie Institute of Termite Control of Yuhang Hangzhou311100China College of Advanced Agricultural Sciences Zhejiang A&F UniversityHangzhou 311300China

In worldwide,the use of chemical pesticides to protect wood has been greatly restricted.In recent years,a large number of researchers devoted to the search for natural,safe and non-polluting bioactive chemical compounds from plants as an alternative to synthetic organic chemical preservative.In Chinese folk,tung oil can be used as paint for wooden furniture to protect them from pests.This study aimed to evaluate the chemical compositions of raw and heated tung oil and their activity against termite.In choice bioassays,weight loss of wood treated with 5%raw or heated tung oil after 4 weeks was significantly less than that of the control group.In no-choice bioassays,there was a significant difference in termite survival and wood weight loss on raw and heated tung oil-treated wood.When tung oil-treatment concentrations increased to 5%,wood weight loss was less than 10%.There was no significant difference in termite survival and wood weight loss between raw and heated tung oil-treated wood.Survival of termites in both tung oil wood treatments was significantly lower than that in the starvation control after 4 weeks.Raw and heated tung oil significantly improved the resistance of pine wood to termites,and have the potential for the development of natural wood preservatives.

关键词： Termite-resistance Raw and heated tung oil Vernicia fordii coptotermes formosanus

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