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Screening of plant growth promotion bacteria from Begonia grandis and investigation of their promoting effects

DENG Zhenshan;DUAN Yangyang;College of Life Sciences,Yan'an University;  
【Objective】Plant growth promoting bacteria(PGPB)was isolated from Begonia grandis,and the mechanism of growth promoting was studied.【Method】Whole plants of Begonia grandis were collected and roots and stems of health plants were collected and cut to 6-8 segments(0.5 cm each)after cleaning and surface disinfection.The segments were cultured in PDA,YMA,and NA media for screening strains with plant growth promotion and inhibitory effects against pathogen.Furthermore,soybean and tomato growth enhancement and antagonism were tested by plant inoculation studies with these isolates under soybean and tomato pot experiments.【Result】A total of 22 strains were isolated from stem and root of Begonia grandis,11 of which had multiple effects of growth promotion and disease prevention.Under pot and field experiment conditions,the plant height,root length,stem length,stem diameter,weight,and fruits fresh weight of plants inoculated with single strain were increased by 27.33%,15.84%,23.46%,13.20%,and 22.39% compared with the control.The combination of Y-01 and Y-02 had better growth promotioneffects and plant height,root,length,stem length,stem diameter and fruit fresh weight increased by37.42%,25.65%,38.53%,16.42% and 34.84%,respectively.Under field experiment condition after 15 and 60 droot irrigation,the results showed that the single strain and the combination of Y-01 and Y-02 could clearly accelerate the growth of tomato.【Conclusion】Multiple strains with growth promotion and disease prevention effects were isolated fromBegonia grandis.
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