论文部分内容阅读
本文在光镜观察的基础上，利用电镜对大豆染色体超显微结构进行了观察，并与野生大豆进行比较，结果表明，栽培大豆具随体的染色体数目在观察２１０个根尖生长点细胞中有８０％以上带有１～２个随体染色体，而野生大豆大多有４个具随体的染色体。电镜下染色体的轴结构，是由许多细丝构成的网络状结构。对其根尖生长点超薄切片的观察，进一步发现在细胞分裂的不同周期中染色体集缩程度存在着差异，可见到诸如１００～１５０ｎｍ、３００ｎｍ、４００～５００ｎｍ等不同的纤维结构等级，显示出染色体高度螺旋形成染色体的过程中，存在有不只是一个的中间结构等级。
In this paper, based on light microscopy, the ultrastructure of soybean chromosome was observed by electron microscopy and compared with that of wild soybean. The results showed that the chromosome number of the cultivated soybean was observed in 210 apical meristem cells More than 80% carry 1 to 2 satellite chromosomes, while wild soybean mostly contains 4 satellite chromosomes. The electron microscopic chromosome structure is composed of many filaments of the network structure. Observations on the ultrathin section of the apical growth point revealed that there are differences in the extent of chromosome aggregation during different periods of cell division and different fiber structure classes such as 100-150 nm, 300 nm, 400-500 nm, etc., There are more than one level of intermediate structure in the process of chromosomal helical chromosome formation.