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Annals of Botany 37: 573-577, 1973
© 1973 Annals of Botany Company

RESEARCH-ARTICLE

Partial Reversion by 5-Aminouracil of the Inhibition of Coleoptile Growth in Hordeum vulgare by Large Volumes of Water

D. DAVIDSON, G. LONG, T.-Y. WONG and M. MCDERMOTT

Department of Biology, McMaster University Hamilton 16, Ontario, Canada

Received: 25 July 1972   

Barley seedlings show a differential response to an increase in the volume of water on which they are grown. On 20 ml, as compared with 9 ml of water, germination of some seeds is delayed and growth of some coleoptiles is inhibited at 45 h. Both effects increase progressively from 9 to 20 ml. Treatment with 5-aminouracil can reverse, in part, the effects of high volumes of water. With 12, 17, and 20 ml of solution 5-AU increases the frequency of germination and coleoptile growth. Its effect is most marked on 20 ml of solution, i.e. the volume that produces the greatest over-all inhibition of growth when seeds are on water is the one at which 5-AU is most effective in stimulating growth. Of the three concentrations tested, 10–4 M was most effective when used at a volume of 20 ml.


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