Abstract
In the present study four hybrids between winter and summer turnip rape are compared with each other and with their parents. In all crosses the father was the same summer turnip rape, namely Mette. F1 and F2 of the hybrids were intermediate as regards their development in comparison with the parents. About three-fourths of the F1 plants of the cross Rapido X Mette, one half of F1 of the crosses Gruber X Mette and Sprengel X Mette, and only a small part of the crosses Storrybs X Mette gave seed yields. The seed yield per plant of the F1-hybrids was larger than that of the summer turnip rape Mette. The seed weight per silique and the mean seed weight were considerably higher in F2 of all the hybrids than in the summer turnip rape Mette. The green fodder production of the hybrids can be expected to be large. The hybrids seem to be usable in plant breeding work.
Highlights
The study was undertaken in connection with the practical plant breeding work at the institute
In order to have some possibilities for comparison Mette was at the same time sown. These Mette plants were used for comparisons with Fj of the crosses, and the winter turnip rape varieties used as parents in the crosses
The smallest average seed weights and numbers of seeds per silique were found in F, of the cross Storrybs X Mette (Table 5), but these hybrids were very late in development
Summary
In order to have some possibilities for comparison Mette was at the same time sown These Mette plants were used for comparisons with Fj of the crosses, and the winter turnip rape varieties used as parents in the crosses. At this date all the plants of the summer turnip rape variety Mette had reached the ripening stage. In all four cases the height of the hybrids was on an average larger than that of Mette and the corresponding mother variety of winter turnip rape.
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