ISSN:
1432-0886
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Abstract Meloidogyne hapla Race A (meiotic, n=17) females have 17 synaptonemal complexes (SC). The karyotype length is constant throughout pachytene, although nuclear volume increases as pachytene progresses. Each SC has at least one region in which two pairs of lateral elements run parallel to each other for a distance of 1–2 μm, thus forming a “double SC” (dSC). Decondensed chromatin regions (DCR) occur along some SCs and represent 5% of the length of the karyotype. The DCRs may be the location of the sex-determining chromatin. Spermatocytes from males of the same meiotic parthenogenetic race (A) have SCs and cylindrical granular complexes (CGC) while males and females from a mitotic (3n=45) parthenogenetic race (B) lack such structures. The CGCs may contribute precursors necessary for the formation of SCs.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00292221
