Authors: Li Zhi Fang Xu Chuan Kun Zou Chang Song Xi Jia Qin He Yue Qiu Duan Chang Qun Mo Ming He
Publish Date: 2010/12/15
Volume: 62, Issue: 4, Pages: 1152-1159
Abstract
A total of 287 agricultural soil samples collected from 26 provinces or autonomous regions of China were tested on their ability to suppress the conidial germination of nine biocontrol fungal agents These soil samples showed great differences in the degree to inhibit the germination of conidia 228 mean inhibition rate 975 but all exhibited fungistatic activities above the moderate levels mean inhibition rate 50 to most of tested fungi Ten soil samples that have stronger fungistatic intensity germination inhibition rate 683 to the target fungi Trichoderma viride and Paecilomyces lilacinus were selected to evaluate their soil actinobacteria involved fungistasis in soil Of the 1000 isolates from those soil samples 345 actinobacteria exhibited fungistatic activity to conidial germination of T viride and P lilacinus with germination inhibition rates higher than 10 Sequences encoding 16S rRNA gene of the 345 actinobacteria were analyzed by ARDRA and resulted 44 different ARDRA types Fiftysix isolates at least one from each unique ARDRA type were selected for 16S rDNA sequencing and phylogenetic analysis Results indicated that the actinobacteria involved in the soil fungistasis had close phylogenetic relationship with the members of Sterptomycetaceae Microbacteriaceae Micrococcaceae and NocardiaceaWe are grateful to those graduate students of Yunnan University for helping with sample collection This work was funded jointly by “National Key Sciences and Technology Program for Water Solutions” 2009ZX071020040401 NSFC 30460078 30760002 30970100 projects of ZhengZhou Tobacco Research Institute 122009CZ0420 and Department of Science and Technology of Yunnan Province 2007C014 M
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