文献类型：期刊文献

英文题名：Microencapsulation of Bacillus subtilis B99-2 and its biocontrol efficiency against Rhizoctonia solani in tomato

作者：Ma, Xin[1];Wang, Xiaobing[1];Cheng, Juan[1];Nie, Xin[1];Yu, Xuexin[1];Zhao, Yongtian[1];Wang, Wei[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：90

起止页码：34

外文期刊名：BIOLOGICAL CONTROL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000362310400005)】；

基金：The authors gratefully acknowledge financial support from the China Spark Program (2013GA680001) and Key Research Projects of Science and Technology Commission of Shanghai Municipality, P.R. China (12391901800).

语种：英文

外文关键词：Bacillus subtilis; Biocontrol; Microcapsules; Rhizoctonia solani; Spray drying

摘要：Biological control is a promising approach to protecting plants from disease. Bacillus subtilis has been widely used in agriculture for promoting plant growth and biocontrol. However, their short shelf life limits the application of biological pesticides. The objectives of this study were to develop a microencapsulation procedure of B. subtilis B99-2 using maltodextrin and gum arabic as wall materials to determine the optimum conditions of spray-drying in microencapsulation, evaluate storage stability of microcapsules, and assess their biocontrol efficiency against Rhizoctonia solani in tomato under field conditions. We microencapsulated the Bacillus thallus by spray-drying with various concentrations of the wall material. Maltodextrin was found to be an efficient wall material, especially at concentrations higher than 80%, while gum arabic did not affect the bacterial survival rate. The mean survival rate of B. subtilis was more than 90%, when spray drying was performed at 145 degrees C, with a feed flow rate of 550 mL h(-1), and a spray pressure of 0.15 MPa. B. subtilis microcapsule survival rate was 87.53% after 540 d of storage, which was a longer shelf life than that of wettable powders. Moreover, its biocontrol efficacy reached 79.91% when a dosage of 300 g hm(-2) was used, the microcapsule showed higher control efficacy than Thiram wettable powder against R. solani in tomato under field conditions. All these characteristics indicated that B. subtilis microcapsules have the potential to become a successful biocontrol product. (C) 2015 Elsevier Inc. All rights reserved.