藏荠营养器官解剖结构及其与环境的关系
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甘肃农业大学校创新基金(GAU-CX1110);国家自然科学基金地区科学基金(31260122)


Anatomical and Morphological Structure of Nutritive Organs in Hedinia tibetica (Thoms.) Ostenf and Its Adaptation to Ecological Environment
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    摘要:

    藏荠属十字花科植物,生长于高山冰缘地带,为典型的高山耐寒植物。采用石蜡切片方法对藏荠的根、茎和叶3种营养器官的解剖结构进行观察分析,以揭示其形态与环境适应性的关系。结果显示:藏荠在长期的演化过程中,根、茎和叶均具有发达的通气组织;叶片表面有明显的蜡质层和表皮毛;栅栏组织为2~4层,海绵组织明显减少;根横切面呈“车轮形”,具有明显的带状加厚和发达的腔髓组织;根和茎的表皮细胞和皮层细胞均有类似“质壁分离”现象。研究表明,藏荠在结构上具有明显抵御大风、低温、干旱等逆境的生态适应特征,这些独特的结构可能是其长期适应高山冰缘环境的结果。

    Abstract:

    Hedinia tibetica (Thoms.) Ostenf,an endemic Cruciferae species growing near glacier region is one of the typical alpine cold-resistant plant.In order to insight into the morphological adaptation characteristics under the extreme environment,we studied the anatomical structure of nutritive organs,such as leaf,stem and root,of H.tibetica (Thoms.) Ostenf by Paraffin section method.The results showed that there were apparent wax layer and cuticle spur on the leave surface and all three nutritive organs had well developed aerenchyma.In addition,2~4 layers of the palisade tissue were observed and were obviously thicker than the sponge tissue.The transaction of root showed “wheel” shape and moreover exhibited clearly belt thickening and developed marrow cavity.Furthermore,epidermal and cortical cells of root and stem had the apparent plasmolysis phenomenon.This species evolved the obviously morphological and anatomical characteristics to adapt to gale,frozen and drought stress in the alpine region.All these special anatomical structures might be the adaption of H.tibetica to the environment in glacier regions.

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闫成才,刘晓娟,田 青,等.藏荠营养器官解剖结构及其与环境的关系[J].西北植物学报,2013,33(5):946-951

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  • 在线发布日期: 2013-06-05
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