Analysis of chromosome pairing in microspore-derived haploids of broccoli, Brassica oleracea L. var. italica (2n = 18) cvs. Bravo and Green Mountain, revealed a maximum chromosome pairing at MI of 4 I + 1 II + 1 III. These data disagree with the hypothesis that diploid B. oleracea is tetrasomic for three linkage groups but indicate that it could be tetrasomic for one and hexasomic for another. It is suggested that the aneuploid series in Brassica could also be derived from a combination of modified tertiary and compensating trisomics.
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Armstrong et al. (1982) studied this question.
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