Goldstein P, Triantaphyllou A C
J Cell Sci. 1980 Jun;43:225-37. doi: 10.1242/jcs.43.1.225.
In the plant-parasite nematode Heterodera glycines, 2 forms, in addition to the diploid (9 bivalents), have been isolated and analysed: a tetraploid (18 bivalents) and an aneuploid (14 bivalents, hybrid between the diploid and the tetraploid). Observations on the formation of their karyotypes indicates normal and non-homologous pairing. Eighteen normal synaptonemal complexes (SC) are present in pachytene nuclei of the tetraploid. Two of the SCs are enclosed in a large heterochromatin mass that is displaced to one side of the nucleus. Such a mass has not been observed in the diploid or the aneuploid. Another 2 normal SCs of the tetraploid have each a 'modified SC region' (MSC) within which the SC appears disorganized. The aneuploid has 14 SCs that are unattached at either end. Only 25% of the karyotype length is normal in the appearance of the SCs. The rest can be traced by the presence of disorganized SC material and condensed chromatin. Four MSCs are present in the hybrid nuclei. The possible role of the MSCs in the sex determination system is discussed.
在植物寄生线虫大豆孢囊线虫（Heterodera glycines）中，除了二倍体（9个二价体）之外，还分离并分析了另外两种形式：四倍体（18个二价体）和非整倍体（14个二价体，是二倍体和四倍体之间的杂种）。对它们核型形成的观察表明存在正常和非同源配对。四倍体粗线期细胞核中存在18个正常的联会复合体（SC）。其中两个SC被包裹在一个大的异染色质团中，该异染色质团移位到细胞核的一侧。在二倍体或非整倍体中未观察到这样的团块。四倍体的另外两个正常SC各自有一个“修饰的SC区域”（MSC），其中SC看起来杂乱无章。非整倍体有14个SC，两端均未附着。在SC的外观上，核型长度只有25%是正常的。其余部分可以通过杂乱无章的SC物质和浓缩染色质的存在来追踪。杂种细胞核中存在四个MSC。文中讨论了MSC在性别决定系统中的可能作用。
