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Combining ability and heterosis analysis for mineral elements using CMS systems in non-heading Chinese cabbage (Brassica rapa L.)
Brassica vegetables are an important source of dietary nutrition. The nutritional quality regarding mineral elements is gradually one of the most important traits due to year-supply of vegetables in China. However, the breeding and utilization of mineral elements in non-heading Chinese cabbage have few reported. To analyse the heterosis, combining ability, and cytoplasmic effects for mineral elements such as Ca, Fe, Mg and Zn using the two CMS (cytoplasmic male-sterile) newly reported lines in non-heading Chinese cabbage, incomplete diallel experiments were conducted. The heterosis analysis of mineral elements indicated that the crossing combinations A1 × C03, A2 × C03 and A2 × C11 exhibited desirable positive effects of mid-parent heterosis and high-parent heterosis in terms of mineral element content that could be exploited for commercial purposes. The GCA effects analysis of the parental lines indicated that the tester C11 was superior for the improvement of the four mineral elements; the CMS line A1 (hau CMS) had higher GCA effects than did A2 (eru CMS) for Ca and Fe. The hybrid combinations A2 × C11, B × C05 and B × C12 showed significant positive SCA effects for the four mineral elements on overall performance. The analysis revealed cytoplasmic effects of hau CMS and eru CMS were both positive for Ca and Fe, and A1 (hau CMS line) had more significant obvious cytoplasmic effects than did A2 (eru CMS line). These results indicated that the two isonuclear alloplasmic CMS lines of non-heading Chinese cabbage are useful for improving the nutritional quality traits of cruciferous vegetables and heterosis utilization.
CP17357 Accepted 17 November 2017
© CSIRO 2017