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PRELIMINARY STUDIES ON TAXONOMY AND BIOSYSTEMATICS OF THE AA GENOME ORYZA SPECIES (POACEAE)

This paper summarizes recent biosystematic studies of the AA genome Oryza species through interspecific hybridization and meiotic analysis of F I hybrids and their P!ir'ental species and concludes that most of theAA genome species in the O. sativa complex are distinct species with prominent reproductive barriers between them.

The use of RAPD markers to facilitate the identification of Oryza species within a germplasm collection

RAPD analysis was carried out using 93 accessions held within the Oryza collection in the Genetic Resource Center at IRRI and indicates that RAPD technology can be used as a fast and accurate method to assist in the validation of the identification of wild OryZA species.
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Responses to seed dormancy-breaking treatments in rice species (Oryza L.)

Removal of the seed hull is extremely effective for breaking seed dormancy across all Oryza species and some species respond to certain chemical treatments effectively under the optimum temperature regimes.

Hybridization of AA genome rice species from Asia and Australia I. Crosses and development of hybrids

Interspecific and intraspecific crosses of rice species were made involving the AA genome wild species Oryza meridionalis Ng from Australia, O. nivara Sharma et Shastry, and the cultigen O. sativa L. from Asia, with very low pollen stainability and seed fertility of hybrids.
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Taxonomic status of Oryza glumaepatula Steud. II. Hybridization between New World diploids and AA genome species from Asia and Australia

In crosses between O. glumaepatula and the Asian species and other diploid New World accessions IRGC 100961, 103810, and 104386, sterile hybrids were produced with pollen fertility ranging from0 to 35.1% and spikelet fertility from 0 to 8.2%.
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Hybridization of AA genome rice species from Asia and Australia II. Meiotic analysis of Oryza meridionalis and its hybrids

It is concluded from the cytological analysis that the Australian O. meridionalis contains the AA genome which has very high affinity to that in the Asian AA genome wild species of rice.
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Taxonomic status of Oryza glumaepatula Steud. I. Comparative morphological studies of New World diploids and Asian AA genome species

A group of diploid wild rices from South America as O. glumaepatula is supported, which is quite distinct from O. rufipogon and O. nivara from Asia.
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Genetic Differentiation in Oryza meridionalis Ng based on Molecular and Crossability Analyses

The study proves that O. meridionalis is a good taxonomic species undergoing gradual speciation corresponding to its geographic distribution in northern Australia and Irian Jaya.
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Taxonomic status of Oryza glumaepatula Steud. III. Assessment of genomic affinity among AA genome species from the New World, Asia, and Australia

It is concluded from this cytological study that the AA genome is essentially identical in the four Oryza species, as well as in different populations of the same rice species, and it is therefore not recommended to differentiate the genomic designation of AA genomes by adding superscripts for different species.
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The taxonomic status of the wild rice species Oryza ridleyi Hook. f. and O. longiglumis Jansen (Ser. Ridleyanae Sharma et Shastry) from Southeast Asia

The taxonomic status of the two species O. ridleyi and O. longiglumis in Oryza series Ridleyanae was resolved using morphological and molecular markers and Canonical discriminant analysis showed significant differences between the twospecies.
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