Isolation and Identification for Arthrobacter nicotinovorans against Locust from Qinghai-Tibetan Plateau and Optimization of Culture Conditions

doi:10.16409/j.cnki.2095-039x.2018.05.009

Abstract

Abstract: A bacteria strain selected from the soil of Qinghai-Tibetan Plateau was identified as Arthrobacter nicotinovorans and named GZ1-6 based on the 16S rRNA sequence analysis, physiological and biochemical characteristics. Virulence of GZ1-6 to nymph of Locusta migratoria manilensis was evaluated in the laboratory, with a corrected accumulative mortality over 75.56%. The optimum fermentation conditions were determined to be temperature 35℃, pH 7.5, sucrose and yeast extract as carbon and nitrogen source, respectively. The optimized fermentation products showed a 7.7% higher toxicity against L. migratoria manilensis compared with pre-optimum. The results indicate that the strain GZ1-6 can be used as a potential biocontrol agent against the locust in the field.

Key words: isolation and identification, Arthrobacter nicotinovorans, Locusta migratoria manilensis, toxicity test, optimized fermentation condition

CLC Number:

S476.12

LIU Ying, YUE Ying, ZHA Yanmei, JIN Hong, HOU Taiping, TAO Ke. Isolation and Identification for Arthrobacter nicotinovorans against Locust from Qinghai-Tibetan Plateau and Optimization of Culture Conditions[J]. journal1, 2018, 34(5): 708-714.

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