Journal
JOURNAL OF APPLIED GENETICS
Volume 61, Issue 3, Pages 323-335Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13353-020-00557-5
Keywords
Allopolyploids; Resynthesis; Brassica napus; Chromosome rearrangements; FISH; rDNA
Funding
- Ministry of Agriculture and Rural Development, Poland [51]
- Foundation for Polish Science
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Brassica napus is an allopolyploid plant, derived from spontaneous hybridization between Brassica rapa and Brassica oleracea. Intensive breeding has led to a significant reduction in genetic and phenotypic diversity within this species. Newly resynthesized hybrids from progenitor species may restore some diversity in B. napus, but they often are chromosomally and phenotypically unstable. Using fluorescence in situ hybridization, we tested chromosome constitutions in a range of new allopolyploids resynthesized from various parental species. A majority of these allopolyploids were euploid, with the expected chromosome numbers and constitutions, but deviations were also identified. We detected a low level of intergenomic rearrangements in analyzed hybrids and a high level of changes in rDNA loci. Our study revealed a significant effect of maternal cross combination on loss of 35S rDNA loci, especially when B. rapa was the maternal parent. The studied lines were characterized by diversified of pollen viability. In the analyzed hybrids, the erucic acid level in the seed oil ranged from 0 to 43.4% and total glucosinolate content in seeds ranged from 24.3 to 119.2 mu mol g(-1). Our study shows that cytogenetic analysis of B. napus resynthesized hybrids would be useful in breeding for the selection of lines with important agricultural characters and genetically stable stock seed production.
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