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Acta Prataculturae Sinica ›› 2010, Vol. 19 ›› Issue (2): 61-68.

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Identification of Polygonum viviparum endophytic bacteria Z5 and determination of thecapacity to secrete IAA and antagonistic capacity towards pathogenic fungi

LI Zhen-dong1, CHEN Xiu-rong1, LI Peng1, MAN Bai-ying2   

  1. 1.Pratacultural College, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem Ministry
    of Education, Sino-U.S. Centers for Grazingland Ecosystem Sustainability, Agricultural University,
    Lanzhou 730070, China;
    2.Guangzhou University Sontan College, Guangzhou 511370, China
  • Received:2009-10-26 Online:2010-02-25 Published:2010-04-20

Abstract: The study is focused on Polygonum viviparum endophytic bacteria Z5. Salkowski colorimetric determination and confronting cultivation on PDA plates experiment have been used to determine the capacity of Z5 to secrete IAA and Antibacterial spectrum of Pathogenic fungi of Z5. Physiological and biochemical characteristics and 16S rDNA gene sequence analysis have also been used to identify Z5. The results showed that the concentration of IAA secreted by Z5 in the medium containing 100 mg/L tryptophan King is 68.62 mg/L, and the concentration of the one without tryptophan King is 5.14 mg/L. Z5 can inhibit Pathogenic fungi, such as Rhizoctonia solani, Sclerotinia sclerotiorum (rape strain), Alternaria solani, Botrytis cinerea, Exserohilum turcicum, Bipolaris sorokiniana, Fusarium oxysporum f.sp.melonis, showing that Z5 has a wider Antibacterial spectrum. Z5 is Rod-shaped with a size of 1.65-3.34 μm × 0.46-0.71 μm, Gram-positive, and can produce spore in the center. Physiological and biochemical characteristics and 16S rDNA gene sequence analysis show that Z5 is Bacillus subtilis. The study will provide evidences for the exploration and utilization of promoting growth and Antibacterial endophytic bacteria in alpine meadow and it will also provide strain resource for making economical and environment-friendly Biopesticides.

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