Park Dongryeol, Jang Jinwoo, Seo Deok Hyun, Kim Yangseon, Jang Geupil
School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea.
Department of Research and Development, Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup-si, Republic of Korea.
Front Plant Sci. 2024 Sep 25;15:1432494. doi: 10.3389/fpls.2024.1432494. eCollection 2024.
Plant growth-promoting rhizobacteria colonize the rhizosphere through dynamic and intricate interactions with plants, thereby providing various benefits and contributing to plant growth. Moreover, increasing evidence suggests that plant growth-promoting rhizobacteria affect plant tolerance to abiotic stress, but the underlying molecular mechanisms remain largely unknown. In this study, we investigated the effect of strain GH1-13 on drought stress tolerance in rice. Phenotypical analysis, including the measurement of chlorophyll content and survival rate, showed that GH1-13 enhances rice tolerance to drought stress. Additionally, visualizing ROS levels and quantifying the expression of ROS-scavenging genes revealed that GH1-13 treatment reduces ROS accumulation under drought stress by activating the expression of antioxidant genes. Furthermore, the GH1-13 treatment stimulated the jasmonic acid response, which is a key phytohormone that mediates plant stress tolerance. Together with the result that jasmonic acid treatment promotes the expression of antioxidant genes, these findings indicate that GH1-13 improves drought tolerance in rice by reducing ROS accumulation and suggest that activation of the jasmonic acid response is deeply involved in this process.
促进植物生长的根际细菌通过与植物进行动态且复杂的相互作用而定殖于根际，从而带来各种益处并促进植物生长。此外，越来越多的证据表明，促进植物生长的根际细菌会影响植物对非生物胁迫的耐受性，但其潜在的分子机制仍 largely unknown。在本研究中，我们调查了菌株GH1-13对水稻干旱胁迫耐受性的影响。包括叶绿素含量和存活率测量在内的表型分析表明，GH1-13增强了水稻对干旱胁迫的耐受性。此外，可视化活性氧水平并量化活性氧清除基因的表达表明，GH1-13处理通过激活抗氧化基因的表达减少了干旱胁迫下活性氧的积累。此外，GH1-13处理刺激了茉莉酸反应，茉莉酸是介导植物胁迫耐受性的关键植物激素。结合茉莉酸处理促进抗氧化基因表达的结果，这些发现表明GH1-13通过减少活性氧积累提高了水稻的耐旱性，并表明茉莉酸反应的激活深度参与了这一过程。
