Stress tolerance is the predominant strategy among the plant species that colonize the Brazilian rupestrian grassland (Campo rupestre) and is a response to edaphic conditions involving specific morphological and physiological adaptations. Motivated by the need to increase the efficiency in the production of seedlings, we experimentally evaluated whether these plant species are naturally limited in terms of optimum development and if they could have their survival and growth increased when cultivated under enhanced nutrient and water conditions and reduced iron concentration. To experimentally test this hypothesis, we cultivated seedlings of nine plant species in six distinct substrates for 150 days. The percentage of seedling survival had great variation among species (ranging from 40 to 100% survival). Eight out of the nine studied species showed higher growth and higher biomass accumulation as well as greater investment in aerial parts when grown in nursery or organic substrate (up to 10 times greater than the control treatment). This study provides evidence that these species also present reversible adjustment to cope with the poor soil conditions and are able to improve their performance in more fertile soils. Thus, seedling production for the restoration of ironstone rupestrian grasslands can be more efficient.

中文翻译：

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老草地幼苗对土壤质量改善的积极响应

胁迫耐受性是殖民巴西 rupestrian 草原 (Campo rupestre) 的植物物种的主要策略，是对涉及特定形态和生理适应的土壤条件的反应。出于提高幼苗生产效率的需要，我们通过实验评估了这些植物物种在最佳发育方面是否自然受到限制，以及在增强的营养和水分条件下培养并减少铁时，它们是否可以提高存活率和生长率专注。为了通过实验验证这一假设，我们在 6 种不同的基质中培育了 9 种植物的幼苗 150 天。种间幼苗成活率差异很大（成活率从 40% 到 100% 不等）。九个研究物种中有八个在苗圃或有机基质中生长时表现出更高的生长和更高的生物量积累以及对地上部分的更大投资（比对照处理高出 10 倍）。这项研究提供的证据表明，这些物种还可以进行可逆的调整以应对恶劣的土壤条件，并能够提高它们在更肥沃的土壤中的表现。因此，用于恢复铁石橄榄草原的苗木生产可以更有效。这项研究提供的证据表明，这些物种还可以进行可逆的调整以应对恶劣的土壤条件，并能够提高它们在更肥沃的土壤中的表现。因此，用于恢复铁石橄榄草原的苗木生产可以更有效。这项研究提供的证据表明，这些物种还可以进行可逆的调整以应对恶劣的土壤条件，并能够提高它们在更肥沃的土壤中的表现。因此，用于恢复铁石橄榄草原的苗木生产可以更有效。