Chromosome study on woody plants by young leaves and buds - especially on plants belong to Hamamelididae

对木本金缕梅科24个科18个科的染色体形态进行了研究，以期有助于了解染色体的进化以及科内和科内的关系。在18个科中，报道了7个科的核形态：悬铃科、金缕梅科、杜仲科、榆科、红豆科、胡桃科和杨梅科。结果表明，不同科属的间期、前期和中期的核形态和染色体数目具有相似的染色体特征。在中期，所研究的木本金缕梅科的所有属的染色体都有中等着丝粒、亚中部着丝粒和亚末端(或末端)着丝粒频率不同的染色体，除了Myricaseae(Myrica)有中等着丝粒的染色体。大多数科的间期形态特征相似，榆科植物的间期核有两种类型：单染中心型和弥散复合型。综上所述，本研究表明，如果有的话，核形态证据可以适当地用于进一步完善金枪鱼科的超属分类。为此，有必要对更多的基因(科)和种进行进一步的核形态研究。

Karyomorphology in eighteen families of twenty-four families belong to woody Hamamelididae were investigated in an effort to contribute to an understanding of chromosome evolution and inter- and intrafamilial relationships. In the eighteen families, karyomorphology of seven families : Platanaceae, Hamamelidaceae, Eucommiaceae, Ulmaceace, Rhoipteleaceae, Juglandaceae and Myricaceae, have been reported (or in press). The results showed that karyomorphology at interphase, prophase and metaphase, and chromosome number within the genus of respective family showed similar chromosome features. At metaphase all the genera investigated of woody Hamamelididae, however, have chromosomes with median centromeres, those with submedian centromeres and those with subterminal (or terminal) centromeres at different frequencies, excepting that Myricaseae (Myrica) has chromosomes with median centromeres. The morphology at interphase of most families showed similar features, while the Ulmaceae had two types of interphase nucleus ; the simple chromocenter type and the diffuse-complex chromocenter type. In conclution, the present study suggests that, if available, karyomorphological evidence can properly be incorporated in further refining supergeneric classification within Hamamelididae. A further karyomorphological study on more genere (families) and species is necessary for the purpose.