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During 2011–2014, three self-compatible Chinese cabbage inbred lines (, genome AA 2n = 20) were sexually hybridised with cytoplasmic male-sterile (-) and fertile lines of rapeseed ( var. , genome AACC 2n = 38). Interspecific F hybrids and their consecutive back-crosses (BCs) toward  were obtained, and their morphological and commercial characteristics, as well as their ability for generative propagation, were analysed. Cytometric and morphological analyses confirmed the interspecific character of the F hybrids in comparison with  and  parental lines. All interspecific F hybrids had intermediate morphological characteristics typical of both parental components in the generative and vegetative stages. The F hybrids of  ×  were sterile, as were those of fertile  × . Good seed productivity from  ×  and consecutive back-cross 1 (BC)–BC generations with Chinese cabbage as the recurrent parent was obtained. Plants of the BC generation of  ×  were sterile and had highly diversified morphological characteristics, both in the vegetative and generative phases. The BC generation of  was also sterile and more uniform than BC, with good vigour and most of the typical Chinese cabbage agronomic traits. As a result, a collection of Chinese cabbage genotypes having the  trait, which is valuable for the breeding of commercial F hybrids, was obtained for the first time in Poland.

euphytica

Interspecific hybridisation of cytoplasmic male-sterile rapeseed with Ogura cytoplasm and Brassica rapa var. pekinensis as a method to obtain male-sterile Chinese cabbage inbred lines