Bolting and flowering habits of the synthesized rape were inherited from parental varieties of original species such as n=10 and n=9 groups in the genus Brassica, and were affected by crosses with commercial varieties. In early generations of synthesized rape, vegetative growth showed remarkable vigor, but in proportion to the progress of generations they were gradually reduced in vigor. However, progenies of the synthesized rape regained their vigor when they were crossed with commercial varieties. This tendency may be caused by heterosis, So, it is necessary for them to establish a seed production system keeping remarkable heterosisvigor in vegetative growth, in order to use them as the commercial soiling forage crop.
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