Study of haploidy in swede rape (Brassica napus L. var. oleifera Metzger)

Renard, M.; Dosba, F.

Annales de l' Amelioration des Plantes 30(2): 191-209


Accession: 000992518

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Natural haploids occurred at a mean frequency of 0.085% in winter varieties and 0.1% in spring varieties. Canadian varieties tended to show a higher frequency of natural haploidy than European varieties. These haploid plants could be distinguished by their smaller flowers from normal varieties and they also tended to be later. Homeologous pairing was frequent in the haploids which fell into two groups according to frequency; ring bivalents were more common in the group with the higher frequency than in the other. The group with the higher frequency of ring bivalents consisted only of spring varieties. The percentage of haploids obtained from anther culture varied amongst varieties and was generally higher in spring varieties than in winter ones. Overall, 52.1% of the embryoids obtained developed into plantlets. Haploids, diploids, triploids and aneuploids with chromosome numbers between 19 and 38 were observed in the material deriving from anther culture.