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Effect of Uracil and 5‐Nitrouracil on Growth and Flowering of Tomato
Author(s) -
Mathur S. N.,
Sharma R. A.
Publication year - 1968
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1968.tb07317.x
Subject(s) - uracil , distilled water , shoot , horticulture , chemistry , plant growth , nitrogen , metabolism , botany , biology , biochemistry , dna , chromatography , organic chemistry
The effects of uracil and its analogue 5‐nitrouracil on growth and flowering of tomato have been studied. A few drops (0.3 ml) of solutions containing 15, 30, 60, 90 and 150 μg of each prepared from a stock of 500 mg/I in glass redistilled water were applied per plant on 3–4 top leaves and the apex of one month old seedlings with 6–7 leaves. A second application double in volume of the same chemicals was made on the same plants a week later. The controls were given a distilled water treatment. Treatments with uracil and 5‐nitrouracil significantly increased the plant height and the fresh and dry weights of the shoot. Higher concentrations (500 mg/I) had no promotive effect. Although there had been a significant promotion of the leaf and stem growth, the root growth and the nodes were unaffected. Flowering was significantly hastened by both bases. Treatments with uracil also resulted in the formation of more flowers. Uracil and 5‐nitrouracil also caused significant increases in the total‐N of the leaf and the stem, and the effect on protein metabolism seems to be localised where they act as RNA metabolites. The presence of the nitro‐group in 5‐nitrouracil does not act as an additional source of nitrogen for protein metabolism as it did not have more promotive effects than uracil.