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Oryza glumaepatula Steud.

  • Distribution
  • Habitat
  • Habitat


Genome designation
Chromosome number
Diploid, 2n=24
Latin America
Key characteristics
There is no key character to distinguish this species from Asian A-genome wild rice and it resembles O. rufipogon of Asia
In the Amazon basin this species exhibits both annual and perennial characteristics. Annual characteristics include high seed production; perennial characteristics include tillering from upper nodes and long anthers. Has ability to break at nodes in rising water and become free floating.
Potentially useful traits
Male sterility
Latin American A-genome germplasm is complex and appears to consist of indigenous types and types that have been more recently introduced from Asia and/or Oceania.
Akimoto, M., Y. Shimamoto, and H. Morishima. 1998. Genetic differentiation in Oryza glumaepatula and its phylogenetic relationships with other AA genome species. Rice Genet. Newsl. 14:37-39.
Juliano, A. B., M. E. B. Naredo, and M. T. Jackson. 1998. Taxonomic status of Oryza glumaepatula Steud. I. Comparative morphological studies of New World diploids and Asian AA genome species. Genet. Res. Crop Evol. 45:197-203.
Dalmacio, R., D. S. Brar, T. Ishii, L. A. Sitch, S. S. Virmani, and G. S. Khush. 1996. Male sterile line in rice developed with O. glumaepatula cytoplasm. Int. Rice Res. Newsl. 21(1):22-23.
Akimoto, M. 1999. Bio-systematics in the AA genome wild taxa of genus Oryza (O. sativa complex): A comparative study of morpho-physiological traits, isozymes and RFLPs of nuclear and organelle. Ph. D. Thesis, Hokkaido University.
Vaughan D.A., H. Morishima and K. Kadowaki. 2003. Diversity in the Oryza genus. Current Opinion in Plant Biology 6:139-146