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Oryza coarctata Roxb.

  • Distribution
  • Spikelet


Genome designation
Chromosome number
Tetraploid, 2n=24
South Asia and Myanmar.
Key characteristics
Tall erect herb with creeping rhizomes. Leaves about 40cm long, 15 mm broad, coriaceous, spiny margins. Short ligule fringed with hairs. Panicle up to 20 cm long. Fertile lemma and palea smooth.
Potentially useful traits
Salt resistance.
This species was placed in the separate genus Porteresia by Tateoka (1965). Recently it has been returned to the genus Oryza by Lu and Ge (2004). However, Zuccolo et al. (2007) provide evidence that the genome of Oryza is quite different from other Oryza.
Balakrishna P. 2003. Porteresia coarctata: Scope and limitations of utilization in rice improvement. Pages 359-373 in J.S. Nanda and S.D. Sharma (eds.) Monograph of the genus Oryza. Science Publishers Inc. NH
Lu B.R., S. Ge. 2004. Oryza coarctata: the name that best reflects the relationships of Porteresia coarctata (Poaceae: Oryzeae). Nordic J. Bot. 23: 555-558
Tateoka, T. 1965. Porteresia, a new genus of Graminae. Bull. Natl. Sci. Mus. Tokyo 8:405-406.
Zuccolo, A., A. Sebastian, J. Talag, Y. Yu, H.R. Kim, K. Collura, D. Kudrna, R.A. Wing. 2007. Transposable element distribution, abundance and role in genome size variation in the genus Oryza. BMC Evolutionary Biology (online)