Fusarium wilt of banana, caused by Fusarium oxysporum f. sp. cubense (Foc), tropical race 4 (TR4), is one of the most devastating diseases, thus control of this disease is an urgent need in banana production. Streptomyces morookaensis strain Sm4-1986 significantly inhibited mycelial growth and spore germination of pathogen Foc-TR4. Chrome Azurol S assay showed that the strain Sm4-1986 is able to produce siderophores, and spectrometric scan confirmed that the siderophores produced belong to carboxylate-type. Addition of FeCl3 eliminated the antagonism between the strain Sm4-1986 and Foc-TR4. Inoculation of banana plantlets with strain Sm4-1986 promotes plant growth, which may be mainly due to the production of indole-3-acetic acid (IAA). Application of strain Sm4-1986 to banana plantlets significantly reduced disease severity index and disease incidence of Fusarium wilt. These findings suggest that the Streptomyces morookaensis strain Sm4-1986 could be explored for uses such as biocontrol agents or biofertilizers in banana plantation.

中文翻译：

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一株 Streptomyces morookaensis 菌株促进植物生长并抑制香蕉枯萎病

香蕉枯萎病，由尖孢镰刀菌引起。sp. cubense (Foc)，热带小种 4 (TR4)，是最具破坏性的病害之一，因此控制这种病害是香蕉生产中的迫切需要。Streptomyces morookaensis 菌株 Sm4-1986 显着抑制病原体 Foc-TR4 的菌丝体生长和孢子萌发。Chrome Azurol S试验表明菌株Sm4-1986能够产生铁载体，光谱扫描证实产生的铁载体属于羧酸盐型。添加 FeCl3 消除了菌株 Sm4-1986 和 Foc-TR4 之间的拮抗作用。用菌株 Sm4-1986 接种香蕉幼苗促进植物生长，这可能主要是由于吲哚-3-乙酸 (IAA) 的产生。将菌株Sm4-1986应用于香蕉苗显着降低了枯萎病的病害严重度指数和发病率。这些发现表明 Streptomyces morookaensis 菌株 Sm4-1986 可用于香蕉种植园的生物防治剂或生物肥料等用途。