The nature and extent of synaptonemal complex formation in haploid barley |
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Authors: | Dr. C. B. Gillies |
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Affiliation: | 1. Department of Physiology, Carlsberg Laboratory, Copenhagen 2. School of Biological Sciences, University of Sydney, Botany Building A12, 2006, New South Wales, Australia
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Abstract: | Normal synaptonemal complexes have been found in haploid barley meiotic prophase at stages equivalent to pachytene in diploids. Reconstructions of serially sectioned nuclei have shown that up to 60% of the haploid chromosomes may pair in either intra- or interchromosomal associations. The extent and nature of the synaptonemal complex formation suggest that the chromosome pairing is non-homologous. From the virtual absence of chiasmata in metaphase I stages of the haploids it is inferred that crossing over requires a more precise DNA alignment than is provided by synaptonemal complex formation alone. |
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