Chromosome instabilities in resynthesized Brassica napus revealed by FISH.

Chromosome instabilities in resynthesized Brassica napus revealed by FISH.
J Appl Genet. 2020 Apr 22;:
Authors: Sosnowska K, Majka M, Majka J, Bocianowski J, Kasprowicz M, Książczyk T, Szała L, Cegielska-Taras T
Abstract
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 μmol g-1. Our study shows that cytogenetic analysis of...

Source: J Appl Genet - April 21, 2020 Category: Genetics & Stem Cells Authors: Sosnowska K, Majka M, Majka J, Bocianowski J, Kasprowicz M, Książczyk T, Szała L, Cegielska-Taras T Tags: J Appl Genet Source Type: research