Abstract
Selections for different levels of C18 fatty acids in rapeseed to date have had only limited success, due in part to the low frequency of occurrence of desired genotypes with increased linoleic and decreased linolenic acid. In the progeny of mutation experiments with seeds of the variety Oro (linolenic acid content 8–10%) two stable mutants were selected, one with 5% and the other with 20% linolenic acid in the seed oil. The level of linoleic acid in the two mutants is the same as Oro (16–20%), but the levels of oleic and linolenic acids are inversely altered. In this paper several problems associated with selecting for linoleic and linolenic acids, which became apparent during the mutation studies, are discussed. Many selections made from the mutated material were unstable, reverting to the original Oro fatty acid composition after two or three self-pollinated generations. This fact plus environmental and maternal effects made selection difficult. However, with the use of rapid and simple analytical methods and space-saving growing techniques, these difficulties were overcome.
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References
Downey, R.K., B.M. Craig and C.G. Youngs, JAOCS 46:121 (1969).
Downey, R.K., and S.H. Pawlowski, Research Report to the Canadian Committee on Fats and Oils, September 22, 1970.
Stefansson, B.R., and R.K. Downey, Can. J. Plant Sci. 41:218 (1961).
Kondra, Z.P., and R.K. Downey, Ibid. 49:623 (1969).
Josefsson, E., and L.-Å. Appelqvist, J. Sci. Food Agr. 19:564 (1968).
Downey, R.K., Can. J. Plant Sci. 44:295 (1964).
“Proc. Intern. Conf., Science, Technology and Marketing of Rapeseed and Rapeseed Products,” Ste. Adéle, Quebec, Canada, Sept. 20–23, 1970.
Thies, W., Angewandte Botanik 42:140 (1968).
Rakow, G., Z. Pflanzenzüchtg., In press.
Rakow, G., and W. Thies, Ibid., 67:257 (1972).
Downey, R.K., and B.M. Craig, JAOCS 41:475 (1964).
Thies, W., Z. Pflanzenzüchtg. 65:181 (1971).
Korver, O., E.T. Alderlieste and C. Boelhouwer, JAOCS 44:484 (1967).
Downey, R.K., and B.L. Harvey, Can. J. Plant Sci. 43:271 (1963).
Dorrell, D.G., and R.K. Downey, Ibid. 44:499 (1964).
Rakow, G., Dissertation, Lanw. Fak. Univ. Göttingen, W. Germany, 1972.
Röbbelen, G., and G. Rakow, in “Proc. Intern. Conf. Science, Technology and Marketing of Rapeseed and Rapeseed Products,” Ste. Adéle, Quebec, Canada, Sept. 20–23, 1970.
Canvin, D.T., Can. J. Bot. 43:63 (1965).
Appelqvist, L.-Å., Physiol. Plant. 36:493 (1971).
Kondra, Z.P., and B.R. Stefansson, Can. J. Plant Sci. 50:345 (1970).
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One of six papers presented in the symposium “Rapeseed Marketing and Breeding,” AOCS Meeting, Ottawa, September 1972.
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Rakow, G., McGregor, D.I. Opportunities and problems in modification of levels of rapeseed C18 unsaturated fatty acids. J Am Oil Chem Soc 50, 400–403 (1973). https://doi.org/10.1007/BF02641817
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DOI: https://doi.org/10.1007/BF02641817