Drought is a global problem for crop productivity. Therefore, the objective of this research was to evaluate five dry-Caribbean Bacillus spp. strains in drought stress amelioration in maize plants. Maize seeds were single-strain inoculated and sown in pots under greenhouse conditions. After 12 days, plants were subjected to 33 days of drought conditions, i.e., 30% of soil field capacity, and then collected to measure leaf and root dry biomass, plant height, antioxidant enzymes, proline accumulation, and P⁺, Ca²⁺, and K⁺ uptake. Results correlated drought stress amelioration with the inoculation of Bacillus spp. strains XT13, XT38 and XT110. Inoculated plants showed increases in dry biomass, plant height, and K⁺ and P⁺ uptake. The overall maize antioxidant response to bacterial inoculation under drought stress showed dependence on proline accumulation and decreases in ascorbate peroxidase and glutathione reductase activities. Moreover, results suggest that this stress amelioration is driven by a specific plant-strain correlation observed in antioxidant response changes in inoculated plants under stress. Also, there is a complex integration of several mechanisms, including plant growth-promotion traits and nutrient uptake. Hence, the use of dry-Caribbean plant growth-promoting Bacillus strains represents an important biotechnological approach to enhance crop productivity in arid and semi-arid environments.

中文翻译：

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干加勒比芽孢杆菌属。菌株通过特定菌株的抗氧化反应调节改善了玉米的干旱胁迫。

干旱是全球作物生产力的问题。因此，本研究的目的是评估五个干加勒比芽孢杆菌属。品系改善玉米植物的干旱胁迫。将玉米种子单株接种并在温室条件下播种在盆中。12天后，使植物经受33天的干旱条件，即土壤田间持水量的30％，然后收集以测量叶和根的干生物量，植物高度，抗氧化酶，脯氨酸的积累以及P ⁺，Ca ²⁺和K ⁺吸收。结果将干旱胁迫的改善与芽孢杆菌的接种相关spp。菌株XT13，XT38和XT110。接种的植物显示出干燥生物量，植物高度以及K ⁺和P ⁺吸收增加。玉米在干旱胁迫下对细菌接种的总体抗氧化反应显示出对脯氨酸积累的依赖性，抗坏血酸过氧化物酶和谷胱甘肽还原酶活性下降。此外，结果表明，这种胁迫的缓解是由特定植物-菌株相关性驱动的，该相关性在受胁迫的接种植物的抗氧化剂响应变化中观察到。此外，还存在多种机制的复杂整合，包括植物生长促进性状和养分吸收。因此，使用干燥的促进加勒比植物生长的芽孢杆菌 菌株代表了一种重要的生物技术方法，可以提高干旱和半干旱环境下的作物生产力。