The current taxonomy and perplexity of the genus Oryza (Poaceae)

doi:10.7523/j.issn.2095-6134.2001.4.007

Abstract

Abstract:

The genus Oryza L. is one of the most important plant groups in the grass family

(Poaceae), which includes more than 20 species and is distributed in tropics and subtropics of the

world. The future breakthrough of rice breeding relies greatly on the exploration and utilization of

rich germplasm in the rice genepool, particularly the wild rice species. Because of its significant im-

portance in the agricultural production, the genus Oryza has attracted much attention of many taxon-

omists, geneticists, breeders, and molecular biologists for various kinds of research. During the last

two hundred and fifty years since the first description of the genus Oryza by Linnaeus, great changes

have taken place in the genus in terms of number of species and taxonomic status. Many taxonomists

have made extensive researches on species circumscription and taxonomic ranking at the subgenus

level, which was essential for the establishment of the modern taxonomic systems of Oryza. The tax-

onomic system established by Roschevicz (1931) based on his comprehensive and detailed studies on

plant specimens and literature provided an important foundation for the modern taxonomy of the ge-

nus Oryza. Sharma & Shastry (1965) offered a taxonomic system of Oryza, which was essentially

influenced by that of Roschevicz. This system treated subgenus rank properly, but their definition of

Oryza was in a much wider sense and several species in this system have been excluded from the

current Oryza. Vaughan (1989) extensively studied and compared Oryza samples from all over the

world and provided a taxonomic system including updated data such as morphological variation, geo-

graphic distribution, and genome constitution of each species. This system not only adopted a rea-

sonable generic definition, but also provided a good reference of species relationship. Unfortunately,

the subgenus rank “complex” used by Vaughan (1989) does not have any legitimate standing in the

International Code of Botanic Nomenclature (ICBN). Lu (1999) summarized the major taxonomic

studies of previous authors including new species published in Oryza over the past ten years, and

proposed an Oryza taxonomic system with 3 sections, 7 series and 24 species. We provided in this

paper the most updated studies of the Oryza species and suggested a revised version of Oryza taxon-

omy with a morphological key to species. We also discussed the existing problems in the taxonomy of

the genus Oryza.

Key words: Poaceae, Oryzeae, Oryza, Taxonomy, Species relationship, Morphology

LU Bao-Rong, GE Song, SANG Tao, CHEN Jia-Kuan, HONG De-Yuan. The current taxonomy and perplexity of the genus Oryza (Poaceae)[J]. , 2001, 39(4): 373-388.

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The current taxonomy and perplexity of the genus Oryza (Poaceae)

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