Weedy rice (Oryza spp.) diversity in southern Brazil
| Autor: | Lariza Benedetti, Luis Antonio de Avila, Jesus Juares Oliveira Pinto, Vívian Ebeling Viana, L. B. Piveta, Fabiane Pinto Lamego, José Alberto Noldin, Nilda Roma-Burgos |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Genetic diversity Oryza sativa biology Red rice 04 agricultural and veterinary sciences Plant Science Phenotypic trait Oryza biology.organism_classification 01 natural sciences Agronomy 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Paddy field Weed Agronomy and Crop Science 010606 plant biology & botany Weedy rice |
| Zdroj: | Weed Science. 69:547-557 |
| ISSN: | 1550-2759 0043-1745 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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