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Oryza punctata Kotschy ex Steud.

  • Distribution
    Distribution
  • Distribution
    Distribution

  • Inflorescence
    Inflorescence
  • Spikelet
    Spikelet

Explanations

Genome designation
BB, BBCC
Chromosome number
Diploid and tetraploid, 2n=24, 2n=48
Distribution
Africa
Key characteristics
Ligule about 3mm, truncate glabrous and splits, panicle branches spreading.Diploid race: Seed length about 6mm, flag leaf width narrow about 14mm, awn about 4.7cm, not strongly perennial.Tetraploid race: Seed length about 4.8 mm, flag leaf width about 21 mm, awn about 3 cm, strongly perennial.
Habitat
The two cytological races have distinct habitats. The diploid is a weedy species of open habitats whereas the tetraploid species is usually found in semi-shaded habitats
Notes
Sometimes grows sympatric with O. longistaminata as a weed of rice fields. Easily distinguished from O. longistaminata by its lighter yellow green leaves (See Fig. d).
References
Kim, H.R., P. San Miguel, W. Nelson, K. Collura, M. Wissotski, J.G. Walling, J.P. Kim, S.A. Jackson, C. Soderlund, R.A. Wing. 2007. Comparative mapping between Oryza sativa (AA genome type) and O. punctata (BB genome type). Genetics 176: 379-390
Sano, Y. 1980. Adaptive strategies compared between the diploid and tetraploid forms of O. punctata. Bot. Mag. Tokyo 93:171-180.
Sasahara, T., T. Sengoku, and Y. Sano. 1982. CO2 and water vapour exchange as related to shade tolerance of O. punctata Kotschy. Photosynthetica 16(3): 356-361.
Tateoka, T. 1965a., A taxonomic study of Oryza eichingeri and O. punctata. Bot Mag. Tokyo 78:156-163.
Tateoka, T. 1965b. Taxonomy and chromosome numbers of African representatives of the Oryza officinalis complex. Bot. Mag. Tokyo 78:198-201.