Summary
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1.
The paper deals with the cross-and self-fertility of certain forms of the genusBrassica.
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2.
It is shown that “rogue” production between two commercial crops depends on the amount of pollen of one incident on the aggregate stigmatic area of the other and a “constant” applicable to the relationship under consideration.
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3.
The “constant” is shown to be the resultant of the self-compatibility of the one crop and the cross-compatibility which exists between the two.
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4.
The value of the two components of the “constant” is shown to depend upon, and largely to be controlled by, the environment.
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5.
Relationships involving variousBrassicae which might lead to valuable recombinations are discussed.
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6.
Weakened vegetative vigour following on weak fertility vigour andvice versa are noted and discussed.
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Nelson, A. Fertility in the genusBrassica . Journ. of Gen. 18, 109–135 (1927). https://doi.org/10.1007/BF02983145
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DOI: https://doi.org/10.1007/BF02983145