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Scientia Silvae Sinicae ›› 2020, Vol. 56 ›› Issue (5): 97-104.doi: 10.11707/j.1001-7488.20200511

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Isolation and Identification of Endophytic Bacteria from Xinjiang Wild Apple (Malus sieversii) and Their Antagonism against Three Pathogens of Apple Trees

Yongli Li1,Yahong Wang1,Le Chang1,Hairu Yu1,Zhou Zhou1,Wenxia Zhao2,Liangjian Qu2,*   

  1. 1. College of Forestry, Henan University of Science and Technology Luoyang 471003
    2. Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry Key Laboratory of Forest Protection of National Forestry and Grassland Administration Beijing 100091
  • Received:2018-12-05 Online:2020-05-25 Published:2020-06-13
  • Contact: Liangjian Qu

Abstract:

Objective: In this study,endophytic bacteria were isolated and screened from a wild apple (Malus sieversii) in Xinjiang,which is an excellent germplasm resource in China,in order to obtain new bacterial resources for biological control of apple diseases. Method: Endophytic bacteria were isolated from the branches of M. sieversii by the methods of dilution plating and tissue isolation. Seven endophytic bacteria strains,with the strong inhibitory effect on three pathogenic fungi (Botryosphaeria dothidea,Colletotrichum gloeosporioides and Phomopsis mali),were selected by the method of plate confrontation. The 7 strains were identified based on morphological,physiological and biochemical characteristics,as well as 16S rDNA sequence analysis. Their pathogenicity was determined by using in vitro inoculation tests. Result: In this study,a total of 217 strains of endophytic bacteria were isolated and purified,among which seven strains (M-m7,M-m12,M-r12,P-m9,P-m11,L-m12 and P-r21) with strong inhibitory effects on mycelium growth of three pathogenic fungi of B. dothidea,C. gloeosporioides and P. mali were screened out. Their inhibition rates were 77.00%,72.60%,76.60%,60.64%,65.96%,65.81% and 71.79% on B. dothidea; 69.85%,64.95%,68.87%,68.37%,56.12%,53.54% and 65.66% on C. gloeosporioides; 77.63%,79.22%,72.60%,69.37%,70.27%,69.30% and 71.05% on P. mali,respectively. Strains M-m7,M-m12,P-m11 and L-m12 were identified as Bacillus subtilis,strains M-r12 and P-m9 were identified as B. elezensis and strain P-r21 was identified as B. amyloliquefaciens. Inoculation tests showed the 7 strains had no pathogenicity to apple tree itself. Conclusion: Seven strains of endophytic bacteria in M. sieversii can effectively suppress mycelium growth of B. dothidea,C. gloeosporioides and P. mali,and have no pathogenicity to apple tree.

Key words: Malus sieversii, endophytic bacteria, inhibition activity, Bacillus

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