Salinization of agricultural lands, particularly rice paddies, results in the drastic decline of crop yields. Soil salinization impacts the plant physiology by inducing salt stress which may leads to osmotic stress, ionic stress and water-related nutrient imbalance. These imbalances necessitate the need for plants to produce osmolytes including proline and glycine betaine. This study aimed to elucidate the dynamic changes in proline and glycine betaine accumulation modulated by the inoculation of Brevibacterium linens RS16 in salt-sensitive and moderately salt-tolerant rice plants under salt stress conditions. This study showed the interaction of four major factors including rice genotypes with differing tolerance to salt stress, length of exposure to salt stress, level of salt stress and effects of inoculation. Salt stress resulted in significant reduction in plant growth parameters with the salt-sensitive rice genotype (IR29) having a more significant growth reduction. Both the salt-sensitive and salt-tolerant rice genotypes increased in total proline and glycine betaine accumulation at 3 days and 10 days after subjecting under 50 mM and 150 mM salt stress conditions. A significant increase in proline and glycine betaine was observed in the salt-sensitive genotype after 10 days under 50 mM and 150 mM salt stress conditions. Inoculation of the rice genotypes with B. linens RS16 resulted in the improvement of plant growth parameters in both rice genotypes, and total proline and glycine betaine accumulation, especially in IR29. This study showed that proline and glycine betaine are compatible osmolytes of rice under salt stress, and that inoculation of rice genotypes with B. linens RS16 mediated salt tolerance through improvement of plant growth parameters and proline and glycine betaine accumulation in rice plants.

中文翻译：

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通过接种内生植物促生长菌缓解盐胁迫在水稻（Oryza sativa L.）品种中积累相容溶质

农田，特别是稻田的盐碱化导致作物产量急剧下降。土壤盐渍化通过诱导盐胁迫来影响植物生理，盐胁迫可能导致渗透胁迫、离子胁迫和与水相关的养分失衡。这些不平衡使得植物需要产生包括脯氨酸和甘氨酸甜菜碱在内的渗透剂。本研究旨在阐明在盐胁迫条件下，亚麻短杆菌 RS16 对盐敏感和中度耐盐水稻植株的脯氨酸和甘氨酸甜菜碱积累的动态变化。本研究显示了四种主要因素的相互作用，包括对盐胁迫具有不同耐受性的水稻基因型、暴露于盐胁迫的时间长度、盐胁迫水平和接种效果。盐胁迫导致植物生长参数显着降低，盐敏感水稻基因型 (IR29) 的生长降低更为显着。在 50 mM 和 150 mM 盐胁迫条件下，盐敏感型和耐盐型水稻基因型在 3 天和 10 天的总脯氨酸和甘氨酸甜菜碱积累量均增加。在 50 mM 和 150 mM 盐胁迫条件下 10 天后，在盐敏感基因型中观察到脯氨酸和甘氨酸甜菜碱的显着增加。用亚麻布 RS16 接种水稻基因型可改善两种水稻基因型的植物生长参数，以及总脯氨酸和甘氨酸甜菜碱的积累，尤其是在 IR29 中。本研究表明脯氨酸和甘氨酸甜菜碱是盐胁迫下水稻的相容渗透物，