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首页> 外文期刊>Plant Species Biology >Variations in leaf morpho-anatomy and photosynthetic traits between sun and shade populations of Eurya japonica (Pentaphylacaceae) whose seeds are dispersed by birds across habitats
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Variations in leaf morpho-anatomy and photosynthetic traits between sun and shade populations of Eurya japonica (Pentaphylacaceae) whose seeds are dispersed by birds across habitats

机译:种子分布在鸟类中的欧亚锦鸡(Eurya japonica)的日光和阴暗种群之间叶片形态解剖和光合特性的变化

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摘要

Eurya japonica occurs in diverse light environments through seed dispersal by birds. As the seed size is extremely small, we hypothesized that newly germinated seedlings with restricted depth of roots and length of the hypocotyl would suffer high mortality due to increased transpiration in sunny habitats and low light in shady habitats. We also expected that surviving seedlings would differ in leaf traits between habitats as a result of selection. We aimed to determine how photosynthetic traits differ between habitats and how leaf structure is related to this difference. We examined photosynthesis and leaf morpho-anatomy for plants cloned from cuttings collected from the forest understory (shade population) and neighboring roadsides and cut-over areas (sun population) and then grown under two irradiances (18.5% and 100% sunlight) in an experimental garden. Under growth in 100% sunlight, cloned plants from the sun population exhibited significantly greater area-based photosynthetic capacity compared to cloned plants from the shade population at a comparable stomatal conductance, which was attributable to a higher area-based leaf nitrogen concentration. On the other hand, mean values of photosynthetic capacity did not significantly differ between the two populations. Cloned plants from the sun population had significantly thicker leaf laminas and spongy tissue and lower stomatal density compared to cloned plants from the shade population. Thickened leaf lamina might have increased leaf tolerance to physical stresses in open habitats. The variation in leaf morpho-anatomy between the two populations can be explained in terms of the economy of leaf photosynthetic tissue.
机译:欧亚粳稻通过鸟类传播种子而出现在不同的光照环境中。由于种子的大小非常小,我们假设根部深度和下胚轴长度受限制的新发芽幼苗会因在阳光充足的栖息地蒸腾作用增加和在阴凉的栖息地光线不足而遭受高死亡率。我们还预计,由于选择,存活的幼苗在生境之间的叶片性状将有所不同。我们旨在确定生境之间的光合特性如何不同,以及叶结构如何与这种差异相关。我们检查了从森林林下(阴影种群)以及邻近路边和过渡区域(太阳种群)收集的插条中克隆的植物的光合作用和叶片形态解剖,然后在两种辐照度(18.5%和100%阳光)下生长。实验花园。在100%的日光下生长下,与具有可比的气孔导度的阴影种群的克隆植物相比,来自太阳种群的克隆植物表现出明显更高的基于面积的光合作用能力,这归因于较高的基于面积的叶氮浓度。另一方面,两个种群的光合能力平均值没有显着差异。与来自阴影种群的克隆植物相比,来自太阳种群的克隆植物的叶片薄层和海绵状组织明显厚,气孔密度较低。在开阔的生境中,增厚的叶片叶片可能增加了叶片对物理胁迫的耐受性。可以根据叶片光合组织的经济性来解释两个种群之间叶片形态解剖学的差异。

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