Department of Botany, Institute of Biology - Section of Plant Physiology, Federal University of Pelotas, Pelotas, RS, Brazil; CNR-IPSP- National Research Council, Institute for Sustainable Plant Protection, US, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Firenze, Italy.
Department of Botany, Institute of Biology - Section of Plant Physiology, Federal University of Pelotas, Pelotas, RS, Brazil.
Plant Sci. 2021 Oct;311:110994. doi: 10.1016/j.plantsci.2021.110994. Epub 2021 Jul 17.
Drought is a pivotal cause for crop yield reductions. When subjected to recurrent external stimuli, plants can develop memory of stress responses that, eventually, enables improved plant tolerance to environmental changes. In addition, despite causal relationships, these responses may vary according to hierarchical levels of observation. Thus, this study aims to check the responses of recurrent and non-recurrent stresses in two rice genotypes observing their drought memory responses at different levels of organization, that is, on a physiological, biochemical and metabolomic scale and for end in global PCA. For this, seventy variables were measured on the scales described in order to obtain a large number of observations. The memory responses were evident in almost all scales observed. The lowland genotype, especially plants not subjected to recurrent water shortage, showed higher damage to the photosynthetic apparatus under drought conditions, although it has exhibited more evident memory response effect after rehydration. On the other hand, the upland genotype appears to be more tolerant to drought insofar lower biochemical damage was observed. Specific behaviors of each genotype at biochemical and metabolomics levels and similar behavior at physiological level were observed. This study demonstrates the importance of observation at different hierarchical levels.
干旱是导致作物减产的关键因素。当植物受到反复的外部刺激时，它们可以对压力反应产生记忆，最终提高植物对环境变化的耐受性。此外，尽管存在因果关系，但这些反应可能因观察的层次不同而有所不同。因此，本研究旨在检查两个水稻基因型在反复和非反复胁迫下的反应，观察它们在不同组织水平上的干旱记忆反应，即生理、生化和代谢组学水平，并最终在全局 PCA 中结束。为此，在上述各尺度上测量了 70 个变量，以获得大量的观测值。在几乎所有观察到的尺度上都明显存在记忆反应。在低地基因型中，特别是没有受到反复缺水的植物，在干旱条件下对光合机构的损伤更大，尽管在重新水合后，它表现出了更明显的记忆反应效应。另一方面，高地基因型似乎对干旱更具耐受性，因为观察到的生化损伤较低。在生化和代谢组学水平上观察到每个基因型的特定行为，在生理水平上表现出相似的行为。本研究证明了在不同层次上观察的重要性。
