Common name: Modern sugarcanes
Scientific name: Saccharum spontaneum L
Chinese name: 甜根子草
Taxonomy
Angiosperms/Monocotyledoneae/Gramineae/Saccharum/Saccharum spontaneum L
Overview
Modern sugarcanes are polyploid interspecific hybrids, combining high sugar content from Saccharum officinarum with hardiness, disease resistance and ratooning of Saccharum spontaneum.Saccharum spontaneum is a kind of soil-protecting plant which can grow in arid sandy land because of its well-developed rhizome and strong soil-fixing ability.
Sequencing of a haploid S. spontaneum, AP85-441, facilitated the assembly of 32 pseudo-chromosomes comprising 8 homologous groups of 4 members each, bearing 35,525 genes with alleles defined. The reduction of basic chromosome number from 10 to 8 in S. spontaneum was caused by fissions of 2 ancestral chromosomes followed by translocations to 4 chromosomes. Surprisingly, 80% of nucleotide binding site-encoding genes associated with disease resistance are located in 4 rearranged chromosomes and 51% of those in rearranged regions. Resequencing of 64 S. spontaneum genomes identified balancing selection in rearranged regions, maintaining their diversity. Introgressed S. spontaneum chromosomes in modern sugarcanes are randomly distributed in AP85-441 genome, indicating random recombination among homologs in different S. spontaneum accessions.
Genomic information
Choromsome number : 2n=8X=64
Protein coding genes : 83826
Genes assembled on chromosomes : 67456
Total genome size(Mb) : 3360
Mapped sequence size(Mb) : 2900
Scaffold n50(Mb) : 0.045
Data sources
Date download
genomic.cds: protein.faa: genomic.gff:
