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The Journal of Heredity 1983:74(1):65-67
© 1983 The American Genetic Association 74:65-67

other

Inheritance of variegation in Brassica campestris L.

F. C. Orakwue, and L. V. Crowder

research fellow, Institute for Agricultural Research, Ahmadu Bello University P.M.B. 1044, Zaria, Nigeria
former professor of plant breeding, Cornell University Ithaca, New York, 14853

Abstract

The variegated trait in Brassica campestris L. is distinguished by patches of white and pinkish-purple color on the foliage stems and seed pods, and can be identified early in the life of the plant. It is easily classified and thus applicable as a demonstration of genetic principles. In this investigation, five nuclearly inherited variegated mutant stocks of Brassica campestris were studied for eight generations to determine their pattern of inheritance and degree of expressivity. The initial F2 generations and testcrosses gave irregular ratios, but these ratios became more regular and monohybrid for each of the mutant lines when selections were made for more vigorous plants, early seedling emergence, and plump seed. Results indicate that variegation was a homozygous recessive trait in the lines examined, and was linked to cream flower color. Penetrance was complete but expressivity was variable. The variegated trait was expressed early from the seedling stage to maturity, but was most evident at the peak of foliage development. The earlier the period of expressivity, the less vigorous were the plants.


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