摘要
猕猴桃属根第一次木栓形成层来源于皮层最外层的细胞;随着根的增粗,内皮层细胞切向伸长并进行大量的径向分裂,形成一环壁较厚的小细胞;老根韧皮部外具多层增生的薄壁细胞;叶柄的近轴皮层中具2个小维管束。这些特征都是藤山柳属所不具备的。此外,猕猴桃属茎中柱外方的厚壁细胞成石细胞状,而藤山柳属中它们则是典型的初生韧皮纤维结构;猕猴桃属根、茎次生韧皮部的筛管、伴胞及薄壁细胞呈径向排列,而在藤山柳属中它们则呈板状排列,交替出现。根据上述结构差异,作者建议将藤山柳属从猕猴桃科中分离出来。单独成立一科。
The following special structure is possessed by Actinidia not byClematoclethra:the first phyllogen of root is developed in the outermostlyer of cortex;with thicking of root,one circle of small cells are broughtabout by the tangetial extension and radial divisions of endodermis cells.La- yers of dilated parenchyma cells come out outside the phloem of older rootsand two small dorsal bundles in the petiole.The selerenchyma cells externalto the stele of stem are sclerend—like in Actinidia;they are typical structureof fibers in Chematoc lethra.The sieve elements,companion cells and par-enchyma cells of secondary phloem of roots and stems are arranged in radialrows in Actinidia;they are in alternating bands in Clematoclethra.Accor-ding to the above description,Clematoclethra should be separated from Actin-idiaceae and treated as a distinct family.
出处
《河南农业大学学报》
CAS
CSCD
1991年第2期213-217,207,共6页
Journal of Henan Agricultural University
关键词
猕猴桃属
藤山柳属
营养器官
结构
Actinidia
Clematoclethra
vegetative organ
structure
phyllogen
endodermis
secondary phloem
