MORPHOGENESIS IN SPIRODELA OLIGORRHIZA : EFFECTS OF PYRIMIDINE BASE ANALOGUES ON INITIATION, ELONGATION AND DIFFERENTIATION OF FRONDS

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The effect of four pyrimidine base analogues and their antidotes on S, oligorrhiza was studied. FUdR stopped cell division at concentrations of 4×10^<-7>M and higher. This effect could be nullified by the addition of 4×10^<-5>M thymidine. Neither uridine nor uracil had an antidotal effect on FUdR. FU (8×10^<-6>M or higher concentration) affected cell division, frond elongation and differentiation, and could not be counteracted by either thymidine or uracil. TU (8×10^<-4>M) rather specifically inhibited differentiation of frond tissues, while not preventing cell division or the initiation of new generations. Uracil and uridine at about equimolar concentrations completely counteracted the TU effect. AzU (10^<-3>M) suppressed cell division, frond elongation and frond differentiation. When thymidine (10^<-3>M) was added simultaneously with AzU only cell elongation and differentiation of fronds were inhibited, but cell division proceeded. 10^<-3>M uracil (but not uridine) counteracted all effects of AzU.
日本植物生理学会の論文