Abstract
SELF-FERTILIZATION in Lactuca sativa L. is commonly regarded as being complete, although the inflorescences are visited by insects and the possibility of cross-pollination does occur1,2. Some indication that natural crossing takes place was provided by the fact that progenies raised from seed, taken from random plants grown in adjacent plots of a trial of a large number of varieties at Wellesbourne, have contained widely different proportions of off-types. An experiment was carried out in 1955, therefore, to ascertain the amount of crossing which might occur.
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References
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Oliver, G. W., Bur. Plt. Indust. Bull. (U.S.), 167, 1 (1910).
Bremer, A. H., and Grana, J., Gartenbauwiss., 9, 231 (1935).
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WATTS, L. Natural Cross-Pollination in Lettuce, Lactuca sativa L.. Nature 181, 1084 (1958). https://doi.org/10.1038/1811084a0
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DOI: https://doi.org/10.1038/1811084a0
