Weedy Rice (Oryza spp.) Diversity in Southern Brazil

Weedy Rice (Oryza spp.) Diversity in Southern Brazil

Weedy rice (Oryza spp.) is one of the most troublesome weeds affecting rice (Oryza sativa L.) production in many countries. Weedy rice control is difficult in rice fields, because the weed and crop are phenotypically and morphologically similar. Weedy rice can be a source of genetic diversity for cu...

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Bibliographic Details
Published in:Weed science Vol. 69; no. 5; pp. 547 - 557
Main Authors: Piveta, Leonard Bonilla, Noldin, José Alberto, Roma-Burgos, Nilda, Viana, Vívian Ebeling, Benedetti, Lariza, Oliveira Pinto, Jesus Juares, Lamego, Fabiane Pinto, de Avila, Luis Antonio
Format: Journal Article
Language:English
Published: New York, USA The Weed Science Society of America 01-09-2021
Cambridge University Press
Subjects:
Cluster analysis
Clusters
Cultivars
Cultivation
Flowering
Gene flow
Genetic diversity
Grain cultivation
Herbicides
morphological characterization
Morphology
Oryza
Oryza sativa indica
phenological diversity
Phenols
plant traits
Qualitative analysis
red rice
Rice
Rice fields
Seasons
Seeds
Special Issue Article
SPECIAL ISSUE ARTICLES
Subgroups
Weed control
Weeds
Brazil
Rio Grande do Sul Brazil
Cluster analysis
red rice
morphological characterization
phenological diversity
plant traits
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Summary:Weedy rice (Oryza spp.) is one of the most troublesome weeds affecting rice (Oryza sativa L.) production in many countries. Weedy rice control is difficult in rice fields, because the weed and crop are phenotypically and morphologically similar. Weedy rice can be a source of genetic diversity for cultivated rice. Thus, this study aimed to characterize the morphological diversity of weedy rice in southern Brazil. Qualitative and quantitative traits of 249 accessions from eight rice-growing mesoregions in Rio Grande do Sul (RS) and Santa Catarina (SC) states were analyzed. For each accession, 24 morphological descriptors (14 qualitative and 10 quantitative) were evaluated. All 249 accessions from RS and SC are of indica lineage. Considering all the phenotypic traits evaluated, the accessions separated into 14 distinct groups. One of the largest groups consisted of plants that were predominantly tall with green leaves, intermediate shattering, and variable flowering time. Distinct subgroups exist within larger clusters, showing discernible phenotypic diversity within the main clusters. The variability in flowering time was high (77 to 110 d after emergence), indicating high potential for flowering synchrony with rice cultivars and, consequently, gene flow. This indicates the need to remove escapes when planting herbicide-resistant rice. Thus, weedy rice populations in southern Brazil are highly diverse, and this diversity could result in variable response to weed management.
ISSN:0043-1745
1550-2759
DOI:10.1017/wsc.2021.23