Abstract
AMONG the descendants of crosses between an individual belonging to a race of Pisum cultivated Tibet and some of our own edible varieties of peas, sterility affecting about 50 per cent of the ovules and pollen grains has been observed by Miss C. Pellew occur frequently. From other crosses of the same description but with different individuals of the Tibetan variety, the progeny were all fertile. One the sterile plants (F2), self-fertilised, gave a family consisting of fertile and ‘sterile’ plants again showing 50 per cent gametic sterility. The recurrence of gametic sterility pointed to an abnormality in the reduction divisions, and accordingly Miss Pellew asked me to make a cytological examination of the material.
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RICHARDSON, E. A Chromosome Ring in Pisum. Nature 124, 578–579 (1929). https://doi.org/10.1038/124578c0
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DOI: https://doi.org/10.1038/124578c0
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