González-Orenga Sara, Al Hassan Mohamad, Llinares Josep V, Lisón Purificación, López-Gresa M Pilar, Verdeguer Mercedes, Vicente Oscar, Boscaiu Monica
Instituto Agroforestal Mediterráneo (IAM), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
Instituto de Biología Molecular y Celular de Plantas (IBMCP), Universitat Politècnica de València - Consejo Superior de Investigaciones Científicas (CSIC), Camino de Vera s/n, 46022 Valencia, Spain.
Plants (Basel). 2019 Nov 15;8(11):506. doi: 10.3390/plants8110506.
is a genus represented in the Iberian Peninsula by numerous halophytic species that are affected in nature by salinity, and often by prolonged drought episodes. Responses to water deficit have been studied in four Mediterranean species, previously investigated regarding salt tolerance mechanisms. The levels of biochemical markers, associated with specific responses-photosynthetic pigments, mono- and divalent ions, osmolytes, antioxidant compounds and enzymes-were determined in the control and water-stressed plants, and correlated with their relative degree of stress-induced growth inhibition. All the tested taxa are relatively resistant to drought on the basis of both the constitutive presence of high leaf ion levels that contribute to osmotic adjustment, and the stress-induced accumulation of osmolytes and increased activity of antioxidant enzymes, albeit with different qualitative and quantitative induction patterns. activated the strongest responses and clearly differed from , and as indicated by cluster and principal component analysis (PCA) analyses in agreement with its drier natural habitat, and compared to that of the other plants. Somewhat surprisingly, however, was the species most affected by water deficit in growth inhibition terms, which suggests the existence of additional mechanisms of defense operating in the field that cannot be mimicked in greenhouses.
是一个在伊比利亚半岛有众多盐生植物物种的属，这些物种在自然环境中受到盐分影响，并且常常受到长期干旱事件的影响。此前已对四种地中海物种的耐盐机制进行过研究，此次研究了它们对水分亏缺的响应。在对照植物和水分胁迫植物中测定了与特定响应相关的生化标记物水平——光合色素、单价和二价离子、渗透调节物质、抗氧化化合物和酶，并将其与胁迫诱导的生长抑制相对程度相关联。所有测试的分类群基于有助于渗透调节的高叶片离子水平的组成性存在，以及胁迫诱导的渗透调节物质积累和抗氧化酶活性增加，都相对耐旱，尽管具有不同的定性和定量诱导模式。通过聚类分析和主成分分析（PCA）表明，与其他植物相比，[物种名称1]由于其更干燥的自然栖息地，激活了最强的响应，并且明显不同于[物种名称2]、[物种名称3]和[物种名称4]。然而，有点令人惊讶的是，从生长抑制方面来看，[物种名称1]是受水分亏缺影响最大的物种，这表明在田间存在无法在温室中模拟的额外防御机制。
