Data/hora: 12/06/2024 13:21:48

Provedor de dados: 	Bragantia	
País: 	Brazil	
Título: 	Leaf gas exchange and yield of three upland rice cultivars	
Autores: 	Alvarez,Rita de Cássia Félix; Habermann,Gustavo; Crusciol,Carlos Alexandre Costa; Nascente,Adriano Stephan; Rodrigues,João Domingos.	
Data: 	2015-03-01	
Ano: 	2015	
Palavras-chave: 	Oryza sativa; Net photosynthesis; Harvest index; Dry matter accumulation rates; Crop growth rate.	
Resumo: 	Studies of physiological parameters associated with crop performance and growth in different groups of upland rice (Oryza sativa L.) may support plant breeding programs. We evaluated the role of gas exchange rates and dry matter accumulation (DMA) as traits responsible for yields in a traditional (cv. ‘Caiapó’), intermediate (cv. ‘Primavera’) and modern (cv. ‘Maravilha’) upland rice cultivars. Leaf gas exchange rates, DMA, leaf area index (LAI), harvest indexes (HI) and yield components were measured on these genotypes in the field, under sprinkler irrigation. Panicles per m2 and DMA at flowering (FL) and heading, as well as CO2 assimilation rates (A) were similar across these cultivars. The highest yield was found in ‘Primavera’, which may be explained by (i) a two-fold higher HI compared to the other cultivars, (ii) greater rates of DMA during spikelet formation and grain-filling, as well as (iii) a slow natural decrease of A in this cultivar, at the end of the season (between FL and maturation).	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000100001	
Editor: 	Instituto Agronômico de Campinas	
Relação: 	10.1590/1678-4499.0322	
Formato: 	text/html	
Fonte: 	Bragantia  v.74 n.1 2015	
Fonte: 	info:eu-repo/semantics/openAccess