Cytogenetical stability and fertility of an intergeneric amphidiploid line synthesized from Brassica maurorum Durieu. and Raphanus sativus L
1998
Bang, S.W. (Utsunomiya Univ. (Japan). Coll. of Agriculture) | Kaneko, Y. | Matsuzawa, Y.
An intergeneric amphidiploid line, Brassicoraphanus (2n=34, FFRR), which was synthesized from the cross of Brassica maurorum Durieu. (2n=16, FF) x Raphanus sativus L. (cv. "4-season leaf", 2n=18 RR), showed well-regulated chromosome behavior at the meiosis of pollen mother cells (PMCs), which resulted in higher levels of both pollen and seed fertility. All Brassicoraphanus plants obtained by selfing through three generations (S1F1 to S3F1) were true amphidiploids with the sum of the somatic chromosome number of parents being 2n=34. They were intermediate between their parents in several morphological characteristics, such as leaf shape, inflorescence and flower characters except for white petals and the absence of root thickening. The BC1 plants obtain from the backcrossing of the S2F1 plants with B. maurorum were sesquidiploid (2n=25), exhibiting the putative chromosome number with the genomic constitution of FFR. In the present study, the amphidiploid and sesquidiploid plants produced by selfing or sib cross and backcross, respectively, from the Brassicoraphanus will be used as bridge plants for the breeding of the hybrid progenies advocated by Matsuzawa et al. (1996)
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