Abstract
The incidence of somatic crossing over on the leaves ofGlycine max var L65-1237 is reduced when seeds are treated with 1 to 2×10-4M solutions of deoxyribose cytidine. The major effect is seen after about 16 hours of soaking the seeds in water followed by nucleoside treatment. Suggestion is made regarding the positioning of heterochromatic regions of homologous chromosomes adjacent to each other and joined with the annuli of nuclear membrane (see Comings, 1968). It is hypothesized that nucleosides degrade the connecting microtubular remnants of spindle fibers and hence reduce the chances of somatic crossing over by disturbing the inter-chromosomal arrangements.
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