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Growth Regulators and Prickly Sida Seed Dormancy

Published online by Cambridge University Press:  12 June 2017

R.J. Newton
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
G.H. Egley
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776

Abstract

Dormant (fresh) and nondormant (afterripened) prickly sida (Sida spinosa L.) seeds were extracted and bioassayed for both inhibitory and promotory growth regulators. Both dormant and nondormant prickly sida seeds contained water-soluble inhibitors, but these inhibitor levels in nondormant seeds did not change after 8 hr of incubation. A basic inhibitor was present in dormant seeds, but not in nondormant seeds. Exogenous growth regulators stimulated germination of dormant seeds only when a portion of the seed coat was removed. Promoter levels in nonincubated, dormant and nondormant seeds were similar, but there were increases in promoter levels in nondormant seeds after 8 hr of incubation. However, it was not determined whether the promoter increases were a cause or a result of germination.

Type
Research Article
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

Literature Cited

1. Amen, R.D. 1967. The effects of gibberellic acid and scarification on the seed dormancy and germination in Luzula spicata . Physiol. Plant. 20:612.Google Scholar
2. Amen, R.D. 1968. A model of seed dormancy. Bot. Rev. 34:131.Google Scholar
3. Egley, G.H. 1972. Influence of the seed envelope and growth regulators upon seed dormancy in witchweed (Striga lutea Lour.) Ann. Bot. 36:770775.Google Scholar
4. Egley, G.H. 1975. Germination of developing prickly sida seeds. Weed Sci. 24:239243.Google Scholar
5. Frankland, B. and Wareing, P.F. 1960. Effect of gibberellic acid on hypocotyl growth of lettuce seedlings. Nature 185:255256.Google Scholar
6. Ikuma, H. and Thimann, K.V. 1963. The role of the seed coats in germination of photosensitive lettuce seeds. Plant Cell Physiol., Tokyo 4:169185.Google Scholar
7. Jones, R.L. and Varner, J.E. 1967. The bioassay of gibberellins. Planta (Berl.) 72:155161.Google Scholar
8. Kollman, G.E. and Staniforth, D.W. 1972. Hormonal aspects of seed dormancy in yellow foxtail. Weed Sci. 20:472477.Google Scholar
9. Ogawa, Y. 1963. Changes in the content of gibberellin-like substances in ripening seed and pod of Lupinus luteus . Plant Cell Physiol. 4:8594.Google Scholar
10. Ross, J.D. and Bradbeer, J.W. 1971. Studies in seed dormancy. V. The content of endogenous gibberellins in seeds of Cotylus avellana L. Planta 100:288302.Google Scholar
11. Wareing, P.F. and Saunders, P.F. 1971. Hormones and dormancy. Pages 261288 in Machlis, L., ed. Annu. Rev. Plant Physiol. Google Scholar
12. Webb, D.P. and Wareing, P.F. 1972. Seed dormancy in Acer: endogenous germination inhibitors and dormancy in Acer pseudoplatanus L. Planta (Berl.) 104:115125.Google Scholar