Physiological responses to salt stress in young umbu plants
Physiological responses to salt stress in young umbu plants
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DOI：
10.1016/j.envexpbot.2007.11.010
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发表时间：
2008-05-01
影响因子：
5.7
通讯作者：
Neto, Andre Dias de Azevedo
中科院分区：
文献类型：
--
作者：
da Silva, Elizarnar Ciriaco;Nogueira, Rejane Jurerna Mansur Custodio;Neto, Andre Dias de Azevedo
由于有害离子效应和土壤溶液渗透势降低引起的水分胁迫，土壤盐分会影响植物的生长和发育。为了评估盐胁迫对年轻umbu植物的影响，在巴西伯南布哥联邦农村大学植物生理学实验室的温室条件下进行了研究。研究了生长、气孔行为、水关系以及无机和有机溶质，旨在更好地了解 umbu 的反应。植物以增加盐度。植物在含有 0、25、50、75 和 100 mM NaCl 的 Hoagland 和 Arnon 营养液的水洗沙中生长。评估了生长、叶水势、蒸腾作用和扩散阻力。测量了几个植物器官中的 Na+、K+、Cl-、可溶性碳水化合物和游离氨基酸含量。大多数变量受到盐度高于 50 mM NaCl 的影响，表现出以下方面的减少：叶数、株高、茎直径和干质量，以及根冠比的增加。在 75 和 100 mM NaCl 下生长的植物中观察到 psi(pd) 降低。所有高于零的盐含量都会增加叶子中的氖和氯含量。然而，K+含量不受影响。在 50 mM NaCl 以上的处理中，茎和根中的 Na+ 和 Cl- 达到饱和。在umbu植物中没有观察到响应盐胁迫的有机溶质积累。这些结果表明，umbu 植物可以耐受高达 50 mM NaCl 的盐浓度，而不会表现出显着的生理形态变化。 (c) 2007 Elsevier B.V. 保留所有权利。
Soil salinity affects plant growth and development due to harmful ion effects and water stress caused by reduced osmotic potential in the soil solution. In order to evaluate the effects of salt stress in young umbu plants, research was performed in green house conditions at the Laboratory of Plant Physiology at Federal Rural University of Pernambuco, Brazil. Growth, stomatal behaviour, water relations, and both inorganic and organic solutes were studied aiming for a better understanding of the responses of umbu. plants to increasing salinity. Plants were grown in washed sand with Hoagland and Arnon nutrient solution with 0, 25, 50, 75, and 100 mM NaCl. Growth, leaf water potential, transpiration, and diffusive resistance were evaluated. Na+, K+, Cl-, soluble carbohydrates, and free amino acid contents were measured in several plant organs. Most variables were affected with salinity above 50 mM NaCl showing decreases in: number of leaves, plant height, stems diameter, and dry masses, and increases in root-to-shoot ratio. Reductions in psi(pd) were observed in plants grown under 75 and 100 mM NaCl. All salt levels above zero increased Ne and Cl- contents in leaves. However, K+ content was not affected. Na+ and Cl- in stems and roots reached saturation in treatments above 50 mM NaCl. Organic solute accumulation in response to salt stress was not observed in umbu plants. These results suggest that umbu plants tolerate salt levels up to 50 mM NaCl without showing significant physio-morphological alterations. (c) 2007 Elsevier B.V. All rights reserved.