Scientia Agricultura Sinica ›› 2010, Vol. 43 ›› Issue (22): 4754-4760 .doi: 10.3864/j.issn.0578-1752.2010.22.025

• RESEARCH NOTES • Previous Articles     Next Articles

Effects of Combination of Biocontrol Bacteria Complex with Salt Stress-Relieving Strain on Promotion of Cotton Growth

ZHAO Ya-feng, TAO Jing, WU Zhan-sheng, LIU Yan, LI Chun   

  1. (石河子大学农学院/新疆兵团化工绿色过程重点实验室)
  • Received:2010-03-17 Revised:2010-05-26 Online:2010-11-15 Published:2010-11-15
  • Contact: LI Chun

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Abstract:

【Objective】 Effects of multi-functional bacterial mixture BCL-Rs on promotion of cotton growth under salt stress and Rhizoctonia solani damping-off were studied. 【Method】 BCL-Rs were obtained by combining biocontrol bacteria complex BCL-8 with salt stress-relieving strain Klebsiella oxytoca Rs-5. The function of BCL-Rs on cotton growth was investigated in pot tests, plot experiments and field trials. 【Result】 The BCL-Rs had an obvious inhibitory activity to Rhizoctonia solani, and BCL-Rs-treated cottons showed a good performance of relieving salt stress, and significant resistance to damping-off caused by Rhizoctonia solani. Compared with the control, the control efficacy of damping-off on cotton reached up to 55.37% and 51.06% in pot and plot experiments, respectively. And the dry weight of cotton seedlings increased by 40.85% and 25.81% under the salt stress conditions, respectively. The results of cotton field trials showed that the growth of cotton seedlings was promoted by coating and drip irrigation with BCL-Rs. Physiological characters of cotton, including plant fresh weight, dry weight, plant height, and leaf area increased significantly. The production of cotton increased by 10.51% compared with the conventional treatment. 【Conclusion】Cotton damping-off caused by Rhizoctonia solani was significantly suppressed by the bacterial mixture BCL-Rs even under the salt stress conditions, indicating a synergistic effect of biocontrol bacteria BCL-8 and salt stress-relieving strain Rs-5.

Key words: cotton, multi-microbial agent, Bacillus subtilis BCL-8, Rhizoctonia solani, salt stress-relieving

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