Abstract
In spinach the breeding of hybrid varieties is attractive because this may result in a heterosis and/or a transgressive effect. Resistance to downy mildew [Peronospora spinaciae (Mont.) de By] and against mosaic (Cucumis virus 1) can be combined rather easily, since in both cases the resistance depends on one dominant gene. Besides a hybrid variety excludes the growing of later generations.
However, a careful removal of all pollen-producing plants demands so much labour that a production of hybrid seed on a commercial scale involves great difficulties. The creation of an entirely female variety would be a solution for this problem. An outline has been given of the way in which such a variety can be developed, starting from purely female and from intersexual plants.
It is possible to simplify the production of hybrid seed by using a round-seeded female parent and a prickly-seeded male parent. Moreover this will prevent errors: all plants can then be harvested and threshed at the same time and in cleaning the prickly seed can be separated mechanically from the round-seeded commercial seed. The use of a prickly-seeded male parent will be an extra check on the possible growing of later generations by others.
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References
Bemis, W. P. and Wilson, G. B., A new hypothesis explaining the genetics of sex determination in Spinacia oleracea L., J. Heredity 44 (1953): 90–95.
Sneep, J., De stand van de veredeling bij spinazie (The present position of spinach breeding). Thesis Wageningen 1957. Also published in the series of the “Instituut voor de Veredeling van Tuinbouwgewassen, Wageningen, Nederland”, Mededeling 113, 1957, 198 pp., 41 figs. In this thesis many references are mentioned.
Sneep, J., The present position of spinach breeding. Euphytica 7 (1958): 1–8.
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Sneep, J. The breeding of hybrid varieties and the production of hybrid seed in spinach. Euphytica 7, 119–122 (1958). https://doi.org/10.1007/BF00035724
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DOI: https://doi.org/10.1007/BF00035724