摘要
11种竹类果实胚体的比较解剖表明其胚型式样是复杂而多样的。胚的类型、胚芽、胚根与盾片的关系,胚体弯曲程度,中胚轴伸长程度以及盾片的大小和形态等特征,对于不同竹种和不同的竹子类群都多少有差异,与传统分类相比可能一致,也可能有矛盾。泰竹、毛竹、水竹、巴山木竹、冷箭竹为平盾或小角胚根,属于原始类群,合江方竹、实竹子、月月竹、箭竹、缺苞箭竹为大角或垂盾胚根,属于进化种类。合江方竹.实竹子、月月竹胚体弯成垂叠状为进化特征,其它种类为直线胚或较少弯曲为原始性状。箭竹、缺苞箭竹的中胚轴明显伸长是晚出的高级类群,其它种类不伸长或较少伸长为原始类群。
The anatomical types of the embryo of the bamboo fruits are variable and complicated. A lot of characters such as the anatomical types of the embryo, the angles between the radicle and scutel, between the plumule and scutel, the curve degree of the embryo, the extension degree of the mesocotyl, and the size, pattern of the scutel, are more or less different among the bambotaxa. Most of those varities tally with the classification based on morphological characters, on the other hand, some contradictions and overlaps exit. Some taxa of bamboos with radicle with acute angle or parallel to scutel, such as Thyrsostachys siamensis, Phyllostachys pubenscens, P. heteroclada, Bashania fangiana, B.fargesii, belong to the primitive groups, some others, for instances, Chimonobambusa hejiangensis, Sinobambusa sichuanensis, Fargesia denudata are comparativly advanced, since they have radicle with large angle or perpendicular to scutel, some species, e. g., Chimonobambusa hejiangensis, Sinobambusa sichuanensis, Qiongzhuea rigidula, have embryo curved together into reduplicative form and they are comparatively more advanced than others. The extension degree of the embryonal axisis a value in evolution. Since the embryo, especially the mesocotyl, of Fargesia spesacea and F. denudata, are obviously elongated, they are possibly superior group, conversely, taxa with short mesocotyl are primitive group.
出处
《云南植物研究》
CSCD
1992年第1期49-58,共10页
Acta Botanica Yunnanica
基金
国家自然科学基金
关键词
竹子
果实
解剖
系统分类
Bamboo
Embryo
Anatomy
Systematic classification
