Journal
MOLECULAR PHYLOGENETICS AND EVOLUTION
Volume 100, Issue -, Pages 109-123Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2016.04.009
Keywords
Allopolyploidy; Genome evolution; Fluorescence in situ hybridization; Genome size; Phylogeny; rDNA
Funding
- Polish National Science Centre [2011/01/B/NZ8/00096]
- OAD [PL16/2012]
- Polish Ministry of Science and Higher Education [PL16/2012]
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Most of the cultivated chenopods are polyploids, but their origin and evolutionary history are still poorly understood. Phylogenetic analyses of DNA sequences of four plastid regions, nrITS and nuclear 5S rDNA spacer region (NTS) of two tetraploid chenopods (2n = 4x = 36), Andean C. quinoa and North American C. berlandieri, and their diploid relatives allowed inferences of their origin. The phylogenetic analyses confirmed allotetraploid origin of both tetraploids involving diploids of two different genomic groups (genomes A and B) and suggested that these two might share very similar parentage. The hypotheses on the origin of the two allopolyploid species were further tested using genomic in situ hybridization (GISH). Several diploid Chenopodium species belonging to the two lineages, genome A and B, suggested by phylogenetic analyses, were tested as putative parental taxa. GISH differentiated two sets of parental chromosomes in both tetraploids and further corroborated their allotetraploid origin. Putative diploid parental taxa have been suggested by GISH for C quinoa and C berlandieri. Genome sizes of the analyzed allotetraploids fit nearly perfectly the expected additive values of the putative parental taxa. Directional and uniparental loss of rDNA loci of the maternal A-subgenome was revealed for both C berlandieri and C quinoa. (C) 2016 Elsevier Inc. All rights reserved.
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