Abstract
IT appears that dormant rose achenes of many species may be put in the same category as those ‘two-year’ seeds which require a warm period in the soil to permit disintegration of the coat, followed by a period at low temperature to after-ripen the embryo. On the other hand, Harrison1 reports that achenes of R. arvensis germinated in good numbers in the first year after planting in the autumn under natural conditions. This behaviour appears to be characteristic of members of the section Synstylae2 and also to some extent of R. rugosa3.
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References
Harrison, J. W. H. (personal communication).
Rowley, G. D., Amer. Rose Annual, 41, 70 (1956).
Tincker, M. A. H., J. Roy. Hort. Soc., 60, 399 (1935).
Jackson, G. A. D., and Blundell, J. B., J. Hort. Sci., 38, 310 (1963).
Varga, M., Acta Biol. Hung., 7, 39 (1957).
Varga, M., Acta Biol. Hung., 9, 369 (1959).
Bennet-Clark, T. A., and Kefford, N. P., Nature, 171, 645 (1953).
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JACKSON, G., BLUNDELL, J. Germination of Rosa arvensis. Nature 205, 518–519 (1965). https://doi.org/10.1038/205518a0
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DOI: https://doi.org/10.1038/205518a0
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