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Role of seed coat in regulation of seed dormancy in houndstongue (Cynoglossum officinale)

Published online by Cambridge University Press:  12 June 2017

Elisa Stabell ,
Mahesh K. Upadhyaya  and
Brian E. Ellis
Elisa Stabell
Affiliation:
University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
Brian E. Ellis
Affiliation:
University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
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Abstract

To understand the role of the seed coat in regulation of houndstongue seed dormancy, the effects of manipulation of seed coat integrity on seed germination and O2 uptake were studied. The results suggest that the seed coat of this weed regulates dormancy in part by interfering with the diffusion of O2 to the embryo. Scanning electron microscopy showed a network of ridges on the seed coat surface that were partially dissolved following 1.5 min of sulphuric acid scarification. Mechanical scarification removed fragments of the seed coat surface. Both scarification treatments stimulated seed germination. Supply of an elevated level of O2 also stimulated seed germination. O2 uptake by seeds imbibed in O2-saturated water was 150% higher than that for seeds imbibed in air-saturated water. Although all treatments that stimulated seed germination also stimulated O2 uptake, there was a lack of a consistent, quantitative relationship between increases in O2 uptake and seed germination in various experiments. This suggests that limitation of O2 availability to the embryo is not the only factor involved in regulation of houndstongue seed dormancy by the seed coat. Mechanical restriction of embryo expansion by the seed coat may also be important. Methanol-insoluble phenolics constituted < 1% of the total phenolic pool in the embryo. Their potential oxidation could not account for more than a small fraction of the previously reported massive stimulation of O2 uptake by the embryo upon decoating. The present O2 uptake and seed germination studies indicate that not all of the large increase in O2 uptake following decoating is essential for houndstongue seed germination.

Keywords

Houndstongue, Cynoglossum officinale L. CYNOFGerminationoxygen uptakescanning electron microscopyscarificationCYNOF
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 3 , June 1998 , pp. 344 - 350
Copyright
Copyright © 1998 by the Weed Science Society of America 

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References

Literature Cited

Blumenthal, A., Lerner, H. R., Werker, E., and Poljakoff-Mayber, A. 1986. Germination preventing mechanisms in Iris seeds. Ann. Bot. 58: 551–561.CrossRefGoogle Scholar
Boorman, L. A. and Fuller, R. M. 1984. The comparative ecology of two sand dune biennials: Lactuca virosa L. and Cynoglossum officinale L. New Phytol. 69: 609–629.CrossRefGoogle Scholar
Brant, R. E., McKee, G. W., and Cleveland, R. W. 1971. Effect of chemical and physical treatment on hard seed of Penngift crownvetch. Crop Sci. 11: 1–6.Google Scholar
Chow, Y. J. and Lin, C. H. 1991. p-Hydroxybenzoic acid as the major phenolic germination inhibitor of papaya seed. Seed Sci. Technol. 19: 167–174.Google Scholar
Corbineau, F. and Cǒme, D. 1995. Control of seed germination and dormancy by the gaseous environment. Pages 397–424 in Kigel, J. and Galili, G., eds. Seed Development and Germination. New York: Marcel Dekker.Google Scholar
Corbineau, F., Lecat, S., and Cōme, D. 1986. Dormancy of three cultivars of oat seeds (Avena sativa L.). Seed Sci. Technol. 14: 725–735.Google Scholar
Dorne, A. J. 1981. Variation in seed germination inhibition of Chenopodium bonus-henricus in relation to altitude of plant growth. Can. J. Bot. 59: 1839–1901.Google Scholar
Ellis, J. F. and Ilnicki, R. D. 1968. Seed dormancy in corn chamomile. Weed Sci. 16: 111–113.CrossRefGoogle Scholar
Ferraris, L., Abbattista-Gentile, I., and Matta, A. 1987. Variations of phenols concentration as a consequence of stresses that induce resistance to Fusarium wilt of tomato. J. Plant Dis. Prot. 94: 624–629.Google Scholar
Kelly, K. M. and Van Staden, J. 1985. Effect of acid scarification on seed coat structure, germination and seedling vigour of Aspalathus linearis . J. Plant Physiol. 121: 37–45.Google Scholar
Kelly, K. M., Van Staden, J., and Bell, W. E. 1992. Seed coat structure and dormancy. Plant Growth Reg. 11: 201–209.Google Scholar
Lenoir, C., Corbineau, F., and Cōme, D. 1986. Barley (Hordeum vulgare) seed dormancy as related to glumella characteristics. Physiol. Plant. 68: 301–307.Google Scholar
Metzger, J. D. 1992. Physiological basis of achene dormancy in Polygonum convolvulus (Polygonaceae). Am. J. Bot. 79: 882–886.Google Scholar
Pérez-Garcia, F. and Pita, J. M. 1989. Mechanical resistance of the seed coat during germination of Onopordum nervosum Boiss. Seed Sci. Technol. 17: 277–282.Google Scholar
Probert, R. J. 1992. The role of temperature in germination ecophysiology. Pages 282–325 in Fenner, M., ed. Seeds. The Ecology of Regeneration in Plant Communities. Wallingford, Great Britain: CAB International.Google Scholar
Qi, M. Q., Upadhyaya, M. K., Furness, N. H., and Ellis, B. E. 1993. Mechanism of seed dormancy in Cynoglossum officinale L. J. Plant Physiol. 142: 325–330.Google Scholar
Rodriguez, F. M. and Mendoza, E.M.T. 1990. Physicochemical basis for hardseededness in mung bean [Vigna radiata (L.) Wilczek]. J. Agric. Food Chem. 38: 29–32.Google Scholar
Stabell, E. 1995. Physiology of Cynoglossum officinale Seed Dormancy and Germination. M.Sc. thesis. University of British Columbia, Vancouver, BC.Google Scholar
Stabell, E., Upadhyaya, M. K., and Ellis, B. E. 1996. Development of seed coat-imposed dormancy during seed maturation in Cynoglossum officinale . Physiol. Plant. 97: 28–34.Google Scholar
Upadhyaya, M. K. and Cranston, R. S. 1991. Distribution, biology, and control of hound's-tongue in British Columbia. Rangelands 13: 103–106.Google Scholar
Upadhyaya, M. K., Tilsner, H. R., and Pitt, M. D. 1988. The biology of Canadian weeds. 87: Cynoglossum officinale L. Can. J. Plant Sci. 68: 763–774.CrossRefGoogle Scholar
Wareing, P. F. and Foda, H. A. 1957. Growth inhibitors and dormancy in Xanthium seed. Physiol. Plant. 10: 266–280.Google Scholar
Werker, E. 1980/1981. Seed dormancy as explained by the anatomy of embryo envelopes. Isr. J. Bot. 29: 22–44.Google Scholar
Wilkinson, L. 1990. SYSTAT: The System for Statistics. Evanston, IL: SYSTAT.Google Scholar