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首页> 外文期刊>Ecological research >Adaptive components of tolerance to salinity in a saline desert grass Lasiurus scindicus Henrard
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Adaptive components of tolerance to salinity in a saline desert grass Lasiurus scindicus Henrard

机译：盐碱沙漠草Lasiurus scindicus Henrard对盐分耐受性的适应性成分

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摘要

Five differently adapted natural populations of the native salt desert grass Lasiurus scindicus Henrard from Lesser Cholistan Desert (Pakistan) in South Punjab of east central Pakistan, were evaluated to examine their mechanism of adaptation to saline stress based on some key morpho-anatomical and physiological characteristics. Five ecotypes were collected from one saline site, two moderately saline sites, and two highly saline sites. Anatomical adaptations in each ecotype critically supported the physiological, but the adaptations were of specific nature depending on the type of each site's normal habitat conditions. Higher salinities resulted in increased Na+, Cl-, Mg2+, Ca2+ and K+ content in root and shoot. At root level, some specific structural modifications like increased sclerification in cortical and pith regions, endodermal thickness, and number and size of xylem vessels are vital for water conservation under osmotic stress. Several characteristics were promising for increasing the plants ability to deal with osmotic stress, including at the stem level, increased sclerification, stem area, cortical region thickness and vascular bundle area, and at the leaf level, significant structural modifications such as leaf thickness, epidermal thickness, sclerenchymatous area, cortical area, metaxylem area and bulliform cell area were promising. All these may contribute towards water conservation, which ultimately account for ecotype survival under saline-induced physiological droughts.
机译：来自巴基斯坦东部中部旁遮普邦的小乔利斯坦沙漠（巴基斯坦）的五个天然盐适应性天然盐沙漠草Lasiurus scindicus Henrard的自然种群经过评估，基于一些关键的形态解剖和生理特征，研究了它们对盐胁迫的适应机制。 。从一个盐碱位，两个中盐碱位和两个高盐碱位收集了五种生态型。每种生态型的解剖适应都至关重要地支持了生理，但适应的具体性质取决于每个场所的正常栖息地条件的类型。较高的盐分导致根和茎中的Na +，Cl-，Mg2 +，Ca2 +和K +含量增加。在根部，某些特定的结构修饰，例如皮质和髓部区域的硬化度增加，内胚层厚度以及木质部血管的数量和大小，对渗透胁迫下的节水至关重要。有几个特征有望提高植物应对渗透胁迫的能力，包括在茎水平，增加的硬化度，茎面积，皮质区域厚度和维管束面积，以及在叶水平显着的结构修饰，例如叶厚度，表皮厚度，硬化区，皮层区，后木质部区和大疱状细胞区是有希望的。所有这些可能有助于节水，这最终解释了在盐诱导的生理干旱下的生态型生存。

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