The pattern of zygotene and pachytene pairing in allotetraploid Aegilops species sharing the U genome |
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| Authors: | N. Cuñado S. Callejas M. J. García A. Fernández J. L. Santos |
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| Affiliation: | (1) Departamento de Genética, Facultad de Biología, Universidad Complutense, 28040 Madrid, Spain;(2) Centro de Microscopía Electrónica, Universidad Complutense, 28040 Madrid, Spain |
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| Abstract: | Allotetraploid Aegilops species sharing the U genome, Ae. columnaris (UUMM), Ae. ovata (UUMM), Ae. triaristata (UUMM), Ae. triuncialis (UUCC) and Ae. variabilis (UUSS), regularly form bivalents at metaphase I of meiosis. The pattern of zygotene and pachytene pairing was analyzed by whole-mount surface-spreading of synaptonemal complexes under the electron microscope. The data indicated that at the zygotene stage the chromosomes were almost exclusively associated as bivalents; only a few multivalents (7%) were observed. These observations are discussed in relation to mechanisms of diploidization of polyploid meiosis. |
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| Keywords: | Aegilops Allotetraploid Diploidization Pairing control Synaptonemal complex |
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