Isolation,Bioactivity Evaluation and Quantity Distribution of Endophytic Bacteria in Banana
There were 386 isolates of endophytic bacteria obtained from the tissues of healthy banana, such as roots, pseudo-stems, petioles and leaves. Among them, 28 isolates were screened out and found to show an antagonistic ability against 9 common fungus pathogens tested. And, among the antagonistic isolates 9 isolates were observed to inhibit the growth of Fusarium oxysporium, a causal agent of banana wilt, and the inhibition rates were from 80 % to 100 %. According to the fundamental biological characteristics, the 9 endophytic bacteria belong to the genera, Acinetobacter, Bacillus, Brevibacterium, Alcaligenes and Burkholderia. The tests showed that the hyphae of pathogen had different degrees of tumefaction and rupture. The analysis of the quantity distribution of endophytic bacteria in banana demonstrated a decreasing trend in the tissues from roots, pseudostems, petioles, and leaves, respectively.