Drought stress affects not only crop growth but its morpho-physiological and biochemical traits as well to reduce crop productivity. The study reported in this article was designed and implemented to determine the effects of deficit irrigation and bacterial inoculation on flax plants. For this purpose, seeds were inoculated with Bacillus amyloliquefaciens (B1 ), Bacillus sp. Strain1 (B2 ), and Azotobacter chroococcum (A) as plant growth promoting rhizobacteria (PGPR). The individual inoculated plants were then grown under field conditions in 2015, while individually and in combination in pots in 2016. The irrigation regimes in either experiments included 50%, 75%, and 100% crop water requirement. Bacterial cultures were observed to produce ammonia (except B2 ), indole acetic acid, and siderophores. Results showed that the PGPRs employed significantly mitigated the effects of water deficit. Compared with the control plants, the bacterially inoculated plants exhibited enhancements in their relative water content, plant height, water-soluble carbohydrate and proline contents, and antioxidant enzyme activities, but decreased malondialdehyde content. B1 exhibited greater effects on most of the traits investigated under the field conditions rather than those with moderate and severe drought stress; this is while application of the triple bacteria in the pot had greater effects on relative water content, carbohydrate and proline contents, as well as malondialdehyde. The significant differences in abiotic stress indicators in PGPR-treated plants suggest that these bacteria could be used as biofertilizers to assist plant growth and to reduce the adverse effects of deficit irrigation. This article is protected by copyright. All rights reserved.

中文翻译：

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在亏缺灌溉条件下接种芽孢杆菌和固氮菌的亚麻植物的胁迫耐受性

干旱胁迫不仅会影响作物生长，还会影响其形态生理和生化特性，从而降低作物生产力。本文中报告的研究旨在确定亏缺灌溉和细菌接种对亚麻植物的影响。为此，用解淀粉芽孢杆菌 (B1)、芽孢杆菌属种接种种子。菌株 1 (B2) 和色球固氮菌 (A) 作为植物生长促进根际细菌 (PGPR)。2015 年，单独接种的植物在田间条件下种植，2016 年单独和组合在盆中种植。任一实验中的灌溉制度包括 50%、75% 和 100% 的作物需水量。观察到细菌培养物产生氨（B2 除外）、吲哚乙酸和铁载体。结果表明，采用的 PGPR 显着减轻了缺水的影响。与对照植物相比，细菌接种植物的相对含水量、株高、水溶性碳水化合物和脯氨酸含量以及抗氧化酶活性均有所提高，但丙二醛含量有所降低。B1对田间条件下调查的大多数性状表现出更大的影响，而不是对中度和重度干旱胁迫的性状；这是同时在锅中施用三重菌对相对含水量、碳水化合物和脯氨酸含量以及丙二醛的影响更大。PGPR 处理植物中非生物胁迫指标的显着差异表明，这些细菌可用作生物肥料，以帮助植物生长并减少亏缺灌溉的不利影响。本文受版权保护。版权所有。