STUDY ON UTILIZATION OF HETEROSIS IN MUSTARD ( B. JUNCEA )——BREEDING FOR MUSTARD HYBRIDS OF HIGH QUALITY AND VIGOROUS HETEROSIS
Shi Huaqing, Gong Ruifang, Zhuang Lilian, Li Yun, Wu Xueying,Zhang Shuxi (Oil CroP Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, China)
Beginning from 1986, we have displayed researches, centralized in the utilization of heterosis, for vigorous hybrids with lower erucic acid and higher oleic and linoleic acid contents and higher disease resistance. Now, a successful breakthrough hes already been made in researches. 6 male sterile lines, 89S181 and others, with self-bred seed-setting indexes less than unity, rate of male sterile plants 100%, erucic acid contents 0.03-2.51% and linoleic acid 28.30-33.09%, and 5 low-erucic-acld restoring lines, ZKC, 88S016 and others, with rates of restored plants 97.92-100%, have been selected. On the basis of serialization of the "three-lines" , 5 combinations of vigorous heterosis produced seeds l.66-2.78t/ha. Seeds of these combinations contained 0.31-0.64% of erucic acid and 31.06-35.09% of linoleic acid and vigorous heterosis was also found in linoleic acid content. 6 F1 combinations contained linoleic acid higher than the average value of their parents,and 5 of them exceeded the highest parent value.