Data/hora: 03/07/2024 11:20:01

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	29/03/2021	
Data da última atualização: 	29/03/2021	
Autoria: 	PIVETA, L. B.; NOLDIN, J. A.; BURGOS, N. R.; VIANA, V. E.; BENEDETTI, L.; PINTO, J. J. O.; LAMEGO, F. P.; AVILA, L. A.	
Título: 	Weedy Rice Diversity in Southern Brazil.	
Ano de publicação: 	2021	
Fonte/Imprenta: 	Weed Science, Cambridge, UK, v.69 , n.2 , p. 1-37, 2021.	
Idioma: 	Inglês	
Conteúdo: 	Weedy rice (Oryza sativa L.) 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 to 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 the 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 and with green leaves, intermediate shattering, and variable in flowering time. Distinct subgroups exist within larger clusters, showing discernable 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.	
Palavras-Chave: 	cluster analysis; morphological characterization; phenological diversity; plant traits; red rice.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_48716.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
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