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Genome size variation in three Saccharum species

Permanent URL:
http://handle.nal.usda.gov/10113/55242
Abstract:
Saccharum species are autopolyploids with ploidy level ranging from 5× to 16x, and are considered the most complex genomes among crop plants. In present study, the genome sizes of 28 Saccharum spontaneum accessions, 15 Saccharum officinarum accessions, 28 Saccharum robustum accessions, and 12 Saccharum hybrids spp. were analyzed using flow cytometry. The estimated genome sizes of S. officinarum accessions ranged from 7.50 to 8.55 Gb with an average size of 7.88 Gb. In S. robustum, the estimated genome sizes ranged from 7.65 to 11.78, reflecting the variation of ploidy level. In S. spontaneum, the estimated genome sizes varied widely, with a range from 3.36 to 12.64 Gb, also due to variation of ploidy level. The average monoploid genome size of S. officinarum was 985 Mb, and that of S. spontaneum was 843 Mb. The results also showed that genome sizes were correlated with chromosome numbers, and based which, that the unknown chromosome numbers of some accessions could be predicted. The estimated genome sizes of Saccharum germplasm also helped identify some mislabeled accessions and yielded information critical for sugarcane breeding and genome sequencing programs.
Author(s):
Jisen Zhang , Chifumi Nagai , Qingyi Yu , Yong-Bao Pan , Tomas Ayala-Silva , Raymond J. Schnell , Jack C. Comstock , Aru K. Arumuganathan , Ray Ming
Subject(s):
Saccharum officinarum , Saccharum robustum , Saccharum spontaneum , autopolyploidy , chromosome number , flow cytometry , genome , germplasm , hybrids , sugarcane
Source:
Euphytica 2012 6 v.185 no.3
Language:
English
Publisher:
Springer-Verlag
Year:
2012
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.