Pedosphere 26(5): 733--744, 2016
ISSN 1002-0160/CN 32-1315/P
©2016 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Bacillus amyloliquefaciens strain W19 can promote growth and yield and suppress Fusarium wilt in banana under greenhouse and field conditions
WANG Bei-Bei1,3, SHEN Zong-Zhuan1,2, ZHANG Feng-Ge1,2, W.RAZA1, YUAN Jun1,2, HUANG Rong1,2, RUAN Yun-Ze3, LI Rong1,2 and SHEN Qi-Rong1,2
1National Engineering Research Center for Organic-Based Fertilizers, Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095 (China)
2Key Laboratory of Plant Nutrition and Fertilization in Low-Middle Reaches of the Yangtze River, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095 (China)
3Hainan Key Laboratory for Sustainable Utilization of Tropical Bio-Resources, College of Agriculture, Hainan University, Haikou 570228 (China)
ABSTRACT
      Plant growth-promoting rhizobacteria (PGPR) are considered to be the most promising agents for cash crop production via increasing crop yields and decreasing disease occurrence. The Bacillus amyloliquefaciens strain W19 can produce secondary metabolites (iturin and bacillomycin D) effectively against Fusarium oxysporum f. sp. cubense (FOC). In this study, the ability of a bio-organic fertilizer (BIO) containing W19 strain to promote plant growth and suppress the Fusarium wilt of banana was evaluated in both pot and field experiments. The results showed that application of BIO significantly promoted the growth and fruit yield of banana while suppressing the banana Fusarium wilt disease. To further determine the beneficial mechanisms of the strain, the colonization of green fluorescent protein-tagged strain W19 on banana roots was observed using confocal laser scanning microscopy and scanning electron microscopy. The effect of banana root exudates on the formation of biofilm of strain W19 indicated that the banana root exudates may enhance colonization. In addition, the strain W19 was able to produce indole-3-acetic acid (IAA), a plant growth-promoting hormone. The results of these experiments revealed that the application of strain W19-enriched BIO improved the banana root colonization of strain W19 and growth of banana and suppressed the Fusarium wilt. The PGPR strain W19 can be a useful biocontrol agent for the production of banana under field conditions.
Key Words:  biocontrol, bio-organic fertilizer, colonization, crop yield, fungal disease, indole-3-acetic acid, plant growth-promoting rhizobacteria (PGPR), root exudates
Citation: Wang, B. B., Shen, Z. Z., Zhang, F. G., Raza, W., Yuan, J., Huang, R., Ruan, Y. Z., Li, R. and Shen, Q. R. 2016. Bacillus amyloliquefaciens strain W19 can promote growth and yield and suppress Fusarium wilt in banana under greenhouse and field conditions. Pedosphere. 26(5): 733-744.
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