Title:	Leaf gas exchange and yield of three upland rice cultivars.
Authors:	ALVAREZ, R. de C. F. HABERMANN, G. CRUSCIOL, C. A. C. NASCENTE, A. S. RODRIGUES, J. D.
Affiliation:	RITA DE CÁSSIA FELIX ALVAREZ, UFMS; GUSTAVO HABERMANN, UNESP; CARLOS ALEXANDRE COSTA CRUSCIOL, UNESP; ADRIANO STEPHAN NASCENTE, CNPAF; JOÃO DOMINGOS RODRIGUES, UNESP.
Date Issued:	2015
Citation:	Bragantia, Campinas, v. 74, n. 1, p. 1-8, jan./mar. 2015.
Description:	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).
Thesagro:	Arroz Oryza sativa Gas Fisiologia
NAL Thesaurus:	Harvest index Gas exchange Rice
Keywords:	Índice de colheita Intercâmbio de gases
ISSN:	1678-4499
DOI:	10.1590/1678-4499.0322
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPAF)