INHIBITORY EFFECT OF 5-BROMOURACIL AND 5-FLUOROURACIL ON PHOTOPERIODICALLY INDUCED GERMINATION OF ERAGROSTIS SEED |
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Authors: | FUJII TADASHI |
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Institution: | Botanical Institute, Faculty of Science, Tokyo University of Education Otsuka, Tokyo |
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Abstract: | - The inhibitory effects of 5-bromouracil and 5-fluorouracil onthe photoperiodically induced germination of Eragrostis ferrugineaseed were investigated. 5-BU was more effective than 5-FU ininhibiting germination, but less effective in suppressing seedlingelongation.
- The inhibition of germination by 5-BU was specificallyex ertedon the inductive dark process, which i9 essential tothe photoperiodicgermination induction. A high concentration(101:M) of5-FU also elicited a complete inhibition ofgermination. 5-FU,however, did not affect the photoperiodicinduction processes,but inhibited the processes subsequentto them. The inhibitionof germination by 5-BU or 5-FU was alleviatedby neither uracil,thymidine nor orotjc acid.
- The 3eedlinggrowth was effectively inhibited by 5-FU, and theinhibitionwas reversed by uracil, uridine and orotic acid,but not bythymine and thymidine. The effect of 5-FU may, therefore,possiblybe by virtue of its depressing action upon ribonucleicacidsynthesis.
(Received April 18, 1963; ) |
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