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首页> 美国卫生研究院文献>AoB Plants >Bulk elastic moduli and solute potentials in leaves of freshwater coastal and marine hydrophytes. Are marine plants more rigid?
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Bulk elastic moduli and solute potentials in leaves of freshwater coastal and marine hydrophytes. Are marine plants more rigid?

机译：淡水沿海和海洋水生植物叶片中的体积弹性模量和溶质势。海洋植物更僵硬吗？

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Bulk modulus of elasticity (ɛ), depicting the flexibility of plant tissues, is recognized as an important component in maintaining internal water balance. Elevated ɛ and comparatively low osmotic potential (Ψπ) may work in concert to effectively maintain vital cellular water content. This concept, termed the ‘cell water conservation hypothesis’, may foster tolerance for lower soil-water potentials in plants while minimizing cell dehydration and shrinkage. Therefore, the accumulation of solutes in marine plants, causing decreases in Ψπ, play an important role in plant–water relations and likely works with higher ɛ to achieve favourable cell volumes. While it is generally held that plants residing in marine systems have higher leaf tissue ɛ, to our knowledge no study has specifically addressed this notion in aquatic and wetland plants residing in marine and freshwater systems. Therefore, we compared ɛ and Ψπ in leaf tissues of 38 freshwater, coastal and marine plant species using data collected in our laboratory, with additional values from the literature. Overall, 8 of the 10 highest ɛ values were observed in marine plants, and 20 of the lowest 25 ɛ values were recorded in freshwater plants. As expected, marine plants often had lower Ψπ, wherein the majority of marine plants were below −1.0 MPa and the majority of freshwater plants were above −1.0 MPa. While there were no differences among habitat type and symplastic water content (θsym), we did observe higher θsym in shrubs when compared with graminoids, and believe that the comparatively low θsym observed in aquatic grasses may be attributed to their tendency to develop aerenchyma that hold apoplastic water. These results, with few exceptions, support the premise that leaf tissues of plants acclimated to marine environments tend to have higher ɛ and lower Ψπ, and agree with the general tenets of the cell water conservation hypothesis.
机译：表示植物组织柔韧性的体积弹性模量（ɛ）被认为是维持内部水平衡的重要组成部分。升高的ɛ和相对较低的渗透势（）π）可以协同作用，以有效地维持细胞的重要水分含量。这个被称为“细胞节水假说”的概念可能会增强植物对较低土壤水势的耐受力，同时最大程度地减少细胞脱水和收缩。因此，海洋植物中溶质的积累导致Ψπ的降低，在植物与水的关系中起着重要作用，并且可能与更高的works一起作用以达到有利的细胞体积。人们普遍认为，存在于海洋系统中的植物叶片组织较高，据我们所知，尚无研究专门针对存在于海洋和淡水系统中的水生和湿地植物这一概念。因此，我们使用在我们实验室中收集的数据，对38种淡水，沿海和海洋植物物种的叶片组织中的Ψ和Ψπ进行了比较，并结合了文献中的其他值。总体上，在海洋植物中观察到10个最高ɛ值中的8个，在淡水植物中记录了最低25ɛ值中的20个。如预期的那样，海洋植物通常具有较低的Ψπ，其中大多数海洋植物低于-1.0 MPa，而大多数淡水植物高于-1.0 MPa。尽管生境类型和共生水分含量（θsym）之间没有差异，但我们确实在灌木中观察到了与类粒动物相比更高的θsym，并且认为在水生草中观察到的相对较低的θsym可能归因于它们倾向于形成气孔的趋势。质外性水。这些结果，几乎没有例外，支持这样一个前提，即适应海洋环境的植物的叶片组织往往具有较高的ɛ和较低的ππ，并且与细胞节水假说的一般原理一致。

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