CYTOPLASMIC MALE STERILITY IN Brasska oleracea INDUCED BY B. napus CYTOPLASM — FEMALE FERTILITY AND RESTORATION OF MALE FERTILITY

Abstract

The 37-chromosome F1 hybrids obtained from the cross between rutabaga (B. napus L. ssp. rapifera (Metzg.) Sinsk) and cabbage (B. oleracea L. ssp. capitata L.) were backcrossed four times using 2x-cabbages as the male recurrent parent. Female fertility improved rapidly in BC2 progenies whereas male sterility persisted in the B. oleracea type backcross progenies carrying the cytoplasm of B. napus. Male fertility was restored fully when the c genome was reintroduced to the cytoplasm of B. oleracea.Key words: Brassica oleracea, Brassica napus, cabbage, cytoplasmic male sterility