Genetic Resources and Crop Evolution

, Volume 52, Issue 5, pp 575–587 | Cite as

The Weedy Rice Complex in Costa Rica. I. Morphological Study of Relationships Between Commercial Rice Varieties, Wild Oryza Relatives and Weedy Types

  • Griselda Arrieta-Espinoza
  • Elena Sánchez
  • Sergio Vargas
  • Jorge Lobo
  • Tania Quesada
  • Ana M. Espinoza
Article

Abstract

Weedy rice is a complex of Oryza morphotypes widely distributed in commercial rice fields, which interfere with rice cultivation, seed production, industrial processing and commercialization of this crop in several countries. The objective of this study was to characterize the weedy rice complex of Costa Rica by comparing it with the cultivated and wild rice species found in the country. A collection of weedy rice accessions, representative of the morphotypes found in the country, was established and characterized. Their morphometric relationships were established by comparing 27 morphological traits with commercial rice cultivars, landraces and wild Oryza species and by performing a multivariate analysis. Twenty-one weedy rice morphotypes were identified among 735 weedy accessions by using a three-digit code based on seed characters. Three principal components (PCs) explained 66.25% of the variation observed. The first PC accounted for 36.21% of the variation and separated CCDD genome type Oryza latifolia and O. grandiglumis from AA genome species O. sativa, O. glumaepatula, O. rufipogon and O. glaberrima. The second (18.9%) and third (11.14%) PCs separated the weedy morphotype groups from the AA genome species O.sativa, O. glaberrima and O. rufipogon. The weedy morphotypes were scattered between the indica commercial rice varieties, the cluster landraces–glaberrima and O. rufipogon. Additionally, a group of morphotypes showed intermediate characteristics between O. sativa and O. rufipogon, suggesting that hybridization could have taken place in the past between these species. None of the morphotypes collected in Costa Rica clustered with the allotetraploids CCDD species or O. glumaepatula.

Keywords

Costa Rica Oryza sativa Plant morphology Red rice Weedy rice Wild rice 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Griselda Arrieta-Espinoza
    • 1
  • Elena Sánchez
    • 1
  • Sergio Vargas
    • 1
  • Jorge Lobo
    • 2
  • Tania Quesada
    • 1
  • Ana M. Espinoza
    • 1
    • 3
  1. 1.Centro de Investigación en Biología Celular y Molecular (CIBCM)Ciudad de la InvestigaciónCosta Rica
  2. 2.Escuela de BiologíaCosta Rica
  3. 3.Escuela de Agronomía, Facultad de Ciencias AgroalimentariasUniversidad de Costa RicaSan José Costa Rica

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