【摘要】 利用光学显微镜和透射电镜对生长于青海湖湖滨盐碱湿地的先锋植物灰绿藜(Chenopodium glaucum Linn.)及生长于甘肃兰州大学校园内中生环境对照灰绿藜叶片的显微、超微结构进行了比较观察研究。结果发现中生环境灰绿藜叶片较薄 ,有明显的栅栏与海绵组织分化 ;叶绿体呈椭圆形 ,基粒片层较发达且普遍含有淀粉粒。与对照相比 ,生长于高海拔湖滨盐碱湿地灰绿藜叶为等面叶 ,叶片厚 ,角质层厚 ,栅栏组织发达 ,气室明显 ,具表皮毛 ;线粒体较多 ,但嵴不发达 ,叶绿体呈扁船型沿着壁的边缘排列 ,叶绿体的基粒片层不发达且普遍含有脂质球 ,一些细胞中常出现大量的多层膜结构。研究结果表明 2种生态型灰绿藜的形态结构已发生了深刻的变异 ,湖滨灰绿藜表现出适应区域的寒旱化的明显特征更多还原

【Abstract】 The leaf anatomy and ultrastructure of Chenopodium glaucum ,a pioneer plant on the salinized wetland of Qinghai Lake,were studied and compared with those collected from the mid surrounding of Lanzhou University under LM and TEM.The thin leaf blades,evident differentiation of plasiade and spongy parenchyma and well developed grana thyloid and starch grains within the chloroplasts were commonly found in the plant leaves from the mid surrounding.However,thicker leaf blades,cuticula with epidermal hairs and more obvious substomatic chamber were observed in the samples from the salinized wetland.The leaves of the salinized surrounding belong to the typical isolateral leaf.In addition,at the ultrastructure scale,more mitochondria with poorly developed cristae,more boat shaped chloroplasts distributed at the edge of cell wall with poorly developed grana thyloid and sufficient lipid droplets,and more compound annulate lamellae in some cells were detected.The comparison indicated that a great habitat variation did occur between these two ecotypes of chenopodium glaucum and those growing in salinized wetland exist an obvious evolutional trend to adapt the cold and dry environment.更多还原