Co-Authors:
Paris, H.S., Agricultural Research Organization, Division of Vegetable Crops, Newe Ya'ar Experiment Station, P.O., Haifa, Israel
Abstract:
The pachytene complement in microsporocytes was compared among ten races of Ricinus communis L., the castor plant (2n=20). Four kinds of pachytene variations were observed: (1) variation in degree of spreading of the chromosomes; (2) variation in degree of attenuation of heterochromatin; (3) variation in morphology, which appeared to be restricted to the two nucleolar organizing bivalents; (4) variation in frequency of association of each of these two bivalents with the nucleolus. It is suggested that variations in the pachytene chromosomes occur ubiquitously in this species. © 1981 Dr W. Junk Publishers.
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