Santos J L, Cuadrado M C, Díez M, Romero C, Cuñado N, Naranjo T, Martínez M
Departamento de Genética, Facultad de Biología, Universidad Complutense de Madrid, E-28040 Madrid, Spain.
Chromosoma. 1995 Dec;104(4):298-307. doi: 10.1007/BF00352261.
Chromosomal pairing of one triploid and three tetraploid plants of rye, Secale cereale, was analyzed by electron microscopy in surface-spread prophase I nuclei and compared with light microscopic observations of metaphase I cells. Prophase I is characterized by: (i) the weak alignment showed by the three or four unsynapsed or partially homologous synapsed axes; (ii) the low number of pairing partner switches (PPSs) displayed by both trivalents and quadrivalents; and (iii) the existence of complex multivalents in which up to 13 chromosomes in the triploid and 22 chromosomes in the tetraploids were involved. However, only few heterologous chromosomal associations were maintained at metaphase I. The results obtained are discussed under the assumptions of the random end pairing model with some modifications.
通过电子显微镜对黑麦（Secale cereale）的一株三倍体和三株四倍体植株的染色体配对进行了分析，观察了表面铺展的前期I细胞核，并与中期I细胞的光学显微镜观察结果进行了比较。前期I的特征为：（i）三条或四条未联会或部分同源联会的轴显示出较弱的排列；（ii）三价体和四价体显示出的配对伙伴交换（PPS）数量较少；（iii）存在复杂的多价体，其中三倍体中有多达13条染色体，四倍体中有多达22条染色体参与其中。然而，在中期I仅维持了少数异源染色体联会。在对随机末端配对模型进行一些修改的假设下，对所得结果进行了讨论。
