A biosystematic study of the Oryza meyeriana complex (Poaceae)

Abstract

To determine the taxonomic status and to clarify the biosystematic relationships of wild rice species, i.e., Oryza granulata and O. meyeriana in the O. meyeriana complex (Poaceae), a series of intraspecific and interspecific hybridization experiments, genomic analyses through meiotic pairing, and morphological studies were conducted. Hybridization results demonstrate comparatively high crossability with about 34-39% of seed set, and very limited reproductive isolation between O. granulata and O. meyeriana. Chromosome pairing in the parental species and their F1 hybrids indicate very high genomic affinity between the two taxa. Morphological analyses of the parental accessions and their intra- and interspecific hybrids show a large variation among the samples included, but no appreciable grouping was observed. The traditionally used character, i.e., spikelet length, does not contribute significantly to the grouping of the samples included. Based on the facts that the two taxa have negligible reproductive barriers and share almost identical genomes, the authors believe that O. granulata and O. meyeriana do not warrant separate taxonomic status, and recommend that they be combined as Oryza granulata.

Source or Periodical Title

Plant Systematics and Evolution

ISSN

3782697

Page

139-151

Document Type

Article

Subject

Biosystematics, Hybridization, Meiotic pairing, Morphological variation, Oryza, Poaceae, Wild rice

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