Abstract
Fusarium wilt of banana always drives farmers to find new land for banana cultivation due to the comeback of the disease after a few cropping years. A novel idea for solving this problem is the continuous application of bioorganic fertilizer (BIO), which should be practiced from the beginning of banana planting. In this study, BIO was applied in newly reclaimed fields to pre-control banana Fusarium wilt and the culturable rhizobacteria community were evaluated using Biolog Ecoplates and culture-dependent denaturing gradient gel electrophoresis (CD-DGGE). The results showed that BIO application significantly reduced disease incidences and increased crop yields, respectivly. And the stabilized general bacterial metabolic potential, especially for the utilization of carbohydrates, carboxylic acids and phenolic compounds, was induced by BIO application. DGGE profiles demonstrated that resilient community structure of culturable rhizobacteria with higher richness and diversity were observed in BIO treated soils. Morever, enriched culturable bacteria affiliated with Firmicutes, Gammaproteobacteria and Actinobacteria were also detected. In total, continuous application of BIO effectively suppressed Fusarium wilt disease by stabilizing culturable bacterial metabolic potential and community structure. This study revealed a new method to control Fusarium wilt of banana for long term banana cultivation.
Highlights
Compost was able to efficiently control banana Fusarium wilt disease in pot experiments[14] and in field experiments in a banana orchard that had been continuously cropped with bananas for 12 years with serious Fusarium wilt disease[15]
The objectives of this study were to 1) investigate whether the reclaimed fields amended with bio-organic fertilizer treatment (BIO) from the beginning of banana planting can maintain low disease incidence in subsequent years as compared to the fields non-amended with BIO; 2) investigate the effects of BIO on the culturable rhizobacterial community; and 3) decipher the potential biocontrol mechanism of the BIO on Panama disease in the newly reclaimed fields based on culture-dependent methods
There was no significant difference between BIO and CK treatments after one-year of banana planting in different reclaimed fields
Summary
Compost was able to efficiently control banana Fusarium wilt disease in pot experiments[14] and in field experiments in a banana orchard that had been continuously cropped with bananas for 12 years with serious Fusarium wilt disease[15]. The effects of a novel fertilization mode that applied BIO in newly reclaimed fields, on the biocontrol efficacy, crop yield and rhizosphere culturable bacterial community of banana plants were investigated over four subsequent years (2009–2012) using the combined methods of CD-DGGE and Biolog in Lingao county, Hainan province, China. The objectives of this study were to 1) investigate whether the reclaimed fields amended with BIO from the beginning of banana planting can maintain low disease incidence in subsequent years as compared to the fields non-amended with BIO; 2) investigate the effects of BIO on the culturable rhizobacterial community; and 3) decipher the potential biocontrol mechanism of the BIO on Panama disease in the newly reclaimed fields based on culture-dependent methods
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