A Streptomyces morookaensis strain promotes plant growth and suppresses Fusarium wilt of banana
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ORIGINAL ARTICLE
A Streptomyces morookaensis strain promotes plant growth and suppresses Fusarium wilt of banana Zhiyan Zhu 1,2 & Zhihong Tian 1 & Jianxiong Li 2,3 Received: 1 May 2020 / Accepted: 7 August 2020 # Sociedade Brasileira de Fitopatologia 2020
Abstract 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. Keywords Banana (Musa sp.) . Biological control . Fusarium oxysporum f. sp. cubense . Iron . Siderophores . Streptomyces morookaensis
Introduction Bananas are perennial herbs that originated in Southeast Asia and rank the world’s most important fruit in terms of production volume and trade (FAOSTAT 2017). Despite their reputation as dessert items in the industrialized world, they are of far greater importance as staple foods for subsistence farmers in the tropics (O’Donnell et al. 1998). Historically, disease occurrence is the major constraint on the export and subsistence production of banana, and recently, Panama disease or Electronic supplementary material The online version of this article (https://doi.org/10.1007/s40858-020-00396-z) contains supplementary material, which is available to authorized users. * Jianxiong Li [email protected] 1
College of Life Sciences, Yangtze University, Jingzhou 434025, China
2
Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
3
Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou 510650, China
Fusarium wilt incited by the fungus Fusarium oxysporum f. sp. cubense (Foc), tropical race 4 (TR4), is the most devastating disease to banana production. TR4 is a relative new variant of the pathogen Fusarium oxysporum f. sp. cubense, and affects Cavendish cultivar which accounts for almost all of the multibillion-dollar banana export trade, as well as many other types of bananas such as Gros Michel, Pisang Awark, and plantains. The incited disease has caused grave concern in the
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