Hwang Hau-Hsuan, Chien Pei-Ru, Huang Fan-Chen, Yeh Pin-Hsien, Hung Shih-Hsun Walter, Deng Wen-Ling, Huang Chieh-Chen
Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan.
Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 402, Taiwan.
Microorganisms. 2022 Oct 17;10(10):2047. doi: 10.3390/microorganisms10102047.
Global warming and climate change have contributed to the rise of weather extremes. Severe drought and soil salinization increase because of rising temperatures. Economically important crop production and plant growth and development are hindered when facing various abiotic stresses. Plant endophytic bacteria live inside host plants without causing visible harm and can be isolated from surface-sterilized plant tissues. Using plant endophytic bacteria to stimulate plant growth and increase environmental stress tolerance has become an alternative approach besides using the traditional breeding and genetically modifying approaches to select or create new crop types resistant to different environmental stresses. The plant endophytic bacterium, (previously known as ) strain BP-R2, was isolated from the surface-sterilized root tissues of the salt marsh halophyte . The bacteria strain BP-R2 showed high tolerance to different sodium chloride (NaCl) concentrations and produced the auxin plant hormone, indole acetic acid (IAA), under various tested growth conditions. Inoculation of and pak choi ( L. R. Chinensis Group) plants with the strain BP-R2 greatly enhanced different growth parameters of the host plants under normal and salt and drought stress conditions compared to that of the mock-inoculated plants. Furthermore, the hydrogen peroxide (HO) content, electrolyte leakage (EL), and malondialdehyde (MDA) concentration accumulated less in the BP-R2-inoculated plants than in the mock-inoculated control plants under salt and drought stresses. In summary, the plant endophytic bacterium strain BP-R2 increased host plant growth and stress tolerance to salt and drought conditions.
全球变暖和气候变化导致了极端天气的增加。由于气温上升，严重干旱和土壤盐碱化加剧。经济上重要的作物生产以及植物的生长和发育在面临各种非生物胁迫时会受到阻碍。植物内生细菌生活在宿主植物内部而不造成明显危害，并且可以从表面消毒的植物组织中分离出来。除了使用传统育种和基因改造方法来选择或培育抗不同环境胁迫的新作物品种外，利用植物内生细菌来刺激植物生长并提高环境胁迫耐受性已成为一种替代方法。植物内生细菌（以前称为）菌株BP-R2是从盐沼盐生植物表面消毒的根组织中分离出来的。该细菌菌株BP-R2对不同浓度的氯化钠（NaCl）表现出高耐受性，并在各种测试生长条件下产生植物激素生长素吲哚乙酸（IAA）。与模拟接种的植物相比，用菌株BP-R2接种番茄和小白菜（L. R. Chinensis Group）植物在正常、盐和干旱胁迫条件下极大地提高了宿主植物的不同生长参数。此外，在盐和干旱胁迫下，接种BP-R2的植物中过氧化氢（HO）含量、电解质渗漏（EL）和丙二醛（MDA）浓度的积累比模拟接种的对照植物少。总之，植物内生细菌菌株BP-R2提高了宿主植物的生长以及对盐和干旱条件的胁迫耐受性。
