沙冬青叶片结构特征及其与抗寒性的关系

沙冬青叶片上的表皮毛密集,角质层很厚,表皮细胞连接紧密,栅栏组织特别发达,海绵组织很少。在栅栏组织细胞中,液泡膜大量内陷,在液泡中形成各种膜状结构,有的还与附近的细胞质,乃至小泡和内质网一起内陷,形成细胞质突起,进而形成细胞质带,不断分割液泡,使液泡体积越来越小,数量越来越多,分数度大大提高。在这些小液泡中,颗粒状和纤维状物质十分丰富,但一般很少有大量的膜状结构。

CHARACTERISTICS OF LEAF STRUCTURE OF AMMOPIPTANTHUS MONGOLICUS AND ITS RELATION WITH COLD RESISTANCE

The leaves of Ammopiptanthus mongolicus possess dense epidermal haires,thick cutides,close connection of epidermal cells,and well-developed palisade tissue,but few spongy tissue.The tonopalsts of the palisade cell often occur a large amount of endocytosis to form various membrance-shaped structures in the vacuoles, some of them hapens with near cytoplasm, vosicles, as well as endoplasm reticulum together to form cytolasm protuberance which further develops into cytolasm band. Therefore, the vacuoles are broken up continuously, the volumes of vacuoles get smaller and smaller, and the numbers and scattered degree increase greatly. The small vacuoles are rich in granular and fibroid substance, but no many membrance-shaped structures are found.