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Orthologous comparison in a gene-rich region among grasses reveals stability in the sugarcane polyploid genome

Modern sugarcane (Saccharum spp.) is an important grass that contributes 60% of the raw sugar produced worldwide and has a high biofuel production potential. It was created about a century ago through hybridization of two highly polyploid species, namely S. officinarum and S. spontaneum. We investig...

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Published in:The Plant journal : for cell and molecular biology 2007-05, Vol.50 (4), p.574-585
Main Authors: Jannoo, Nazeema, Grivet, Laurent, Chantret, Nathalie, Garsmeur, Olivier, Glaszmann, Jean Christophe, Arruda, Paulo, D'Hont, Angélique
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cited_by cdi_FETCH-LOGICAL-c4822-de8ba90d0b91717bfcef8cd0edf6986e03939ae5a13bef3cf605a63ea02118f03
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container_title The Plant journal : for cell and molecular biology
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D'Hont, Angélique
description Modern sugarcane (Saccharum spp.) is an important grass that contributes 60% of the raw sugar produced worldwide and has a high biofuel production potential. It was created about a century ago through hybridization of two highly polyploid species, namely S. officinarum and S. spontaneum. We investigated genome dynamics in this highly polyploid context by analyzing two homoeologous sequences (97 and 126 kb) in a region that has already been studied in several cereals. Our findings indicate that the two Saccharum species diverged 1.5-2 million years ago from one another and 8-9 million years ago from sorghum. The two sugarcane homoeologous haplotypes show perfect colinearity as well as high gene structure conservation. Apart from the insertion of a few retrotransposable elements, high homology was also observed for the non-transcribed regions. Relative to sorghum, the sugarcane sequences displayed colinearity, with the exception of two genes present only in sorghum, and striking homology in most non-coding parts of the genome. The gene distribution highlighted high synteny and colinearity with rice, and partial colinearity with each homoeologous maize region, which became perfect when the sequences were combined. The haplotypes observed in sugarcane may thus closely represent the ancestral Andropogoneae haplotype. This analysis of sugarcane haplotype organization at the sequence level suggests that the high ploidy in sugarcane did not induce generalized reshaping of its genome, thus challenging the idea that polyploidy quickly induces generalized rearrangement of genomes. These results also confirm the view that sorghum is the model of choice for sugarcane.
doi_str_mv 10.1111/j.1365-313X.2007.03082.x
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ispartof The Plant journal : for cell and molecular biology, 2007-05, Vol.50 (4), p.574-585
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subjects Biological and medical sciences
Botany
Chromosomes, Artificial, Bacterial
Comparative analysis
DNA, Plant - genetics
evolution
Expressed Sequence Tags
Fundamental and applied biological sciences. Psychology
Genes, Plant
Genes. Genome
Genetics
Genomics
Grasses
homoeologous BAC sequence comparison
Life Sciences
Molecular and cellular biology
Molecular genetics
Molecular Sequence Data
Plants genetics
Poacea
Poaceae - genetics
polyploid
Polyploidy
Saccharum - genetics
Sugarcane
title Orthologous comparison in a gene-rich region among grasses reveals stability in the sugarcane polyploid genome
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