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首页> 外文期刊>Marine biology >Plant water relations and ion homoeostasis of Mediterranean seagrasses (Posidonia oceanica and Cymodocea nodosa) in response to hypersaline stress
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Plant water relations and ion homoeostasis of Mediterranean seagrasses (Posidonia oceanica and Cymodocea nodosa) in response to hypersaline stress

机译：高盐胁迫对地中海海草（Posidonia oceanica和Cymodocea nodosa）植物水分关系和离子稳态的影响

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摘要

Changes in plant water relations and ionic homoeostasis can determine plant osmoacclimation and tolerance to hypersaline stress. In this study, we examined the role of ion accumulation in short-term osmotic acclimation capacities of two Mediterranean seagrass species {Posidonia oceanica and Cymodocea nodosa) with differentiated ranges of salinity tolerance. These were tested by exposing plants to a wide range of hypersaline treatments (from 37 to 59.5, practical salinity scale) simulated in a mesocosm system over 7 days. P. oceanica showed a more reduced capacity to adjust its leaf water potential (Ψ_W) than C. nodosa, so that the osmotic gradient towards plant tissues was reduced as external salinity increased in this species. Osmotic potential, Ψ_π, was also reduced in both species, reflecting the activation of osmoregulation. Some ions (as Cl~-) increased in both species, but ionic uptake (relative to ion concentration in seawater) generally decreased at increasing salinities, suggesting the activation of ion-exclusion mechanisms. In P. oceanica leaves, the percentage of participation of ions in the Ψ_π was reduced as salinity increased; this indicated that osmotic acclimation was highly dependent on the accumulation of organic osmolytes (i.e. soluble sugars) in this species, which involves higher metabolic costs. The participation of ions was greater in C. nodosa plants exposed to hypersaline treatments, but the contrasting responses of non-structural carbohydrates, turgor pressure, Ψ_π and ions in the most severe hypersaline treatment, suggested the activation of alternative osmotic strategies. Under normal saline conditions (i.e. controls), C. nodosa plants exhibited higher values of K~+/Na~+ and Ca~(2+)/Na~+ and selectivity of K~+ over Na~+ (S_(K:Na)) than P. oceanica, which are typically related to species more tolerant to salinity stress. With regard to photochemistry, F_v/F_m and α was only reduced in P. oceanica exposed to some hypersaline treatments, although reductions in both rETR and ΦPSII were detected in plants of both species at the most severe hypersaline treatments (59.5). Only C. nodosa exhibited the activation of photoprotective mechanisms as NPQ increments.
机译：植物水分关系和离子同稳态的变化可以决定植物的渗透适应性和对高盐胁迫的耐受性。在这项研究中，我们研究了离子积累在两种具有不同耐盐性范围的地中海海草物种（波西多尼亚海洋藻和Cymodocea nodosa）的短期渗透驯化能力中的作用。通过将植物暴露于中观宇宙系统中，经过7天的多种高盐处理（从37到59.5，实际盐度范围）进行了测试。海洋假单胞菌显示其调节其叶片水势的能力比结节假丝酵母更大，因此随着该物种外部盐度的增加，朝向植物组织的渗透梯度降低。两种物种的渗透势Ψ_π均降低，反映了渗透调节作用的激活。在这两个物种中，某些离子（如Cl〜-）均增加，但随着盐度的增加，离子的吸收（相对于海水中的离子浓度）通常会降低，这表明离子排斥机制的激活。在P. oceanica叶片中，随着盐度的增加，Ψ_π中离子的参与百分比降低；这表明渗透驯化高度依赖于该物种中有机渗透液（即可溶性糖）的积累，这涉及更高的代谢成本。暴露于高盐处理的结节藻植物中离子的参与更大，但是在最严格的高盐处理中，非结构化碳水化合物，膨胀压力，Ψ_π和离子的对比响应表明，替代渗透策略的激活。在生理盐水条件下（即对照），结节梭菌植物的K〜+ / Na〜+和Ca〜（2 +）/ Na〜+值更高，且K〜+的选择性高于Na〜+（S_（K： Na））而不是P. oceanica，这通常与更耐盐胁迫的物种有关。关于光化学，尽管在最严格的高盐处理下两种植物的rETR和ΦPSII均降低，但仅在暴露于某些高盐处理下的海洋假单胞菌中F_v / F_m和α降低。仅结节梭菌表现出随着NPQ增加的光保护机制的激活。

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  • 来源
    《Marine biology》 |2015年第1期|55-68|共14页
  • 作者

    Aurora Garrote-Moreno; Jose Miguel Sandoval-Gil; Juan M. Ruiz; Lazaro Marin-Guirao; Jaime Bernardeau-Esteller; Rocio Garcia Munoz; Jose Luis Sanchez-Lizaso;

  • 作者单位

    Seagrass Ecology Group, Spanish Institute of Oceanography, C/Varadero s, 30740 San Pedro del Pinatar, Murcia, Spain;

    Seagrass Ecology Group, Spanish Institute of Oceanography, C/Varadero s, 30740 San Pedro del Pinatar, Murcia, Spain,Department of Marine Sciences and Applied Biology, University of Alicante, P.O. Box 99,03080 Alicante, Alicante, Spain;

    Department of Marine Sciences and Applied Biology, University of Alicante, P.O. Box 99,03080 Alicante, Alicante, Spain;

    Seagrass Ecology Group, Spanish Institute of Oceanography, C/Varadero s, 30740 San Pedro del Pinatar, Murcia, Spain;

    Seagrass Ecology Group, Spanish Institute of Oceanography, C/Varadero s, 30740 San Pedro del Pinatar, Murcia, Spain,Department of Marine Sciences and Applied Biology, University of Alicante, P.O. Box 99,03080 Alicante, Alicante, Spain;

    Seagrass Ecology Group, Spanish Institute of Oceanography, C/Varadero s, 30740 San Pedro del Pinatar, Murcia, Spain;

    Department of Marine Sciences and Applied Biology, University of Alicante, P.O. Box 99,03080 Alicante, Alicante, Spain;

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