Genomic changes in synthetic Arabidopsis polyploids

摘要: Polyploids are common and arise frequently by genome duplication (autopolyploids) or interspecific hybridization (allopolyploids). Neoallopolyploids display sterility, lethality, phenotypic instability, gene silencing epigenetic changes. Little is known about the molecular basis of these phenomena, how much genomic remodeling happens upon allopolyploidization. Extensive has been documented in wheat, but little occurs cotton. Newly synthesized Arabidopsis allopolyploids, which instability low fertility, displayed several, possibly related mechanisms that can remodel genomes. We detected transcriptional activity several transposons although their transposition was limited. One represents a new family conditionally active En-Spm-like thaliana, underwent CG methylation A random amplified fragment length polymorphism survey suggested at few, specific loci. Meiotic analyses revealed appearance chromosomal fragments substantial fraction anther meiocytes. In individuals produced hybrids between synthetic natural allopolyploid pollen viability inversely correlated with meiotic instability. Activity selected DNA breaks could cause changes inducing translocations rearrangements.