[The discovery of a novel flower color mutation in male sterile rapeseed ( Brassica napus L. )].

The author found a novel yellow-white flower color mutation in the male sterile progenies derived from a commercial Brassica.napus hybrid C022, which was produced by a male sterility line 9012A, whose sterility was controlled by interaction between two pairs recessive genes and a pair of epitatic genes. The mutant was named 991S. 991S had three morphologic characters:(1) The color in the middle of every petal was yellow, yet the both sides were white.(2)Every calyx might become striped albino (3) Only male sterile plants in different populations had mutative character. Except flower color, they had similar morphologic characters to the normal male sterile sib-plants. The plants were slender and little with little flowers that had flat petals, bended stigmas, degenerative stamen, and dry anthers. Primary analysis of its origin and inheritance showed that this mutative character was controlled by recessive partial albino gene.