Resistance in Brassica nigra to Albugo Candida (Pers.) Kuntze race 2 is controlled by a single dominant gene Ac2. Cream pollen (cp), yellow-green cotyledons (ygc1, ygc2), glabrate (glb), yellow-green plant (yg1), virescent leaves (vl), floral retention (fr), folded petals (fp), absence of pigment in various plant parts (a1 and a2 and lutescent plant (lu) are controlled by single recessive genes, whereas xanthovirescence (XV) appears to be dominant and lethal in the homozy-gous condition (XvXv).
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Delwiche et al. (1981) studied this question.