都支杜鹃和黄山杜鹃叶片结构的观察

都支杜鹃和黄山杜鹃叶片的构造,除具有上表皮的角质层较厚并有瘤状突起、有下皮层、叶肉无细胞间隙、栅栏组织细胞多层、机械组织发达等特点外,发现在叶肉的海绵组织中有大量大型的贮水细胞。干旱时贮水细胞失水,引起叶片向下反卷运动,以减少水分的蒸腾,此种适应现象在双子叶植物中极为罕见。

OBSERVATIONS ON THE STRUCTURE OF LEAVES OF RHODODENDRON SHANII AND RHODODENDRON ANHWEINSE

The structure of the leaves of Rhododendron shanii and Rhododendron anhweinse has many xerophistic characters——the upper epidermis with thickening cutele, having hypodermis, without intercellular spaces in mesop- hyll, many-layered palisade tissue,developed machanical tissue and big sized water cells in mesophyll. In dry weather, the water cells lose its water and bring about the leaf rolling up. This adaptability is unusual in dicotyledon.