The benefits of plant growth-promoting microorganisms to increase productivity have been demonstrated in various crops. Little is known about their potential in olive orchards in southern Brazil, whose naturally acidic soils are intensively limed for olive production. The present study investigated the effect of four inoculations (no inoculation, inoculation of the bacterium , inoculation of the fungus and inoculation of the fungus ) at different levels of soil liming on the development of olive seedlings. The results showed that the microorganisms but especially , when applied to the soil, promoted increased growth in height, diameter, and total dry mass yield of young olive trees, especially in conditions of lower soil acidity, with increases of 92, 34 and 33 % respectively, compared to the soil without inoculation. Less acidic environments, more favorable for olive tree development, enhanced the positive effect of these microorganisms. The microorganisms also mitigated the effects in potentially more stressful conditions, as observed by the higher concentration of photosynthesizing pigments, the reduction in hydrogen peroxide content, and the reduction in antioxidant enzyme activities in leaves and roots, in soil pH below that recommended for olive cultivation.

中文翻译：

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促进生长的微生物作为优化橄榄植物生产潜力的可持续替代品

促进植物生长的微生物对提高生产力的益处已在多种作物中得到证实。人们对它们在巴西南部橄榄园中的潜力知之甚少，那里的天然酸性土壤被大量石灰用于橄榄生产。本研究探讨了不同土壤石灰水平的四种接种（不接种、接种细菌、接种真菌和接种真菌）对橄榄幼苗发育的影响。结果表明，微生物尤其是施用于土壤时，促进了幼橄榄树的高度、直径和总干质量产量的增加，特别是在土壤酸度较低的条件下，分别增加了 92%、34% 和 33%分别与未接种的土壤相比。酸性较低的环境更有利于橄榄树的生长，增强了这些微生物的积极作用。微生物还减轻了潜在压力更大的条件下的影响，如在土壤 pH 值低于橄榄种植建议值时，光合色素浓度较高、过氧化氢含量减少以及叶子和根部抗氧化酶活性降低。 。