Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Braz. J. Plant Physiol. (2) Acta Botanica (1) Autor Bernacchi,Carl (1) Habermann,Gustavo (1) Long,Steve (1) Machado,Eduardo Caruso (1) Medina,Camilo Lázaro (1) Pimentel,Carlos (1) Rodrigues,João Domingos (1) Rosa,Luís Mauro Gonçalves (1) Sausen,Tanise Luisa (1) Mais... Palavra-chave A/Ci curves (3) Citrus sinensis L. Osbeck (1) Citrus variegated chlorosis (1) Diurnal changes (1) Gas exchange (1) Lemon (1) Photosynthesis (1) Photosynthetic metabolism (1) Photosynthetic photon flux density (1) Stomata (1) Stomatal limitations (1) Water stress (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2010 (1) 2007 (1) 2003 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Growth and carbon assimilation limitations in Ricinus communis (Euphorbiaceae) under soil water stress conditions Acta Botanica Sausen,Tanise Luisa; Rosa,Luís Mauro Gonçalves. Water availability may influence plant carbon gain and growth, with large impacts on plant yield. Ricinus communis (L.), a drought resistant species, is a crop with increasing economic importance in Brazil, due to its use in chemical industry and for the production of biofuels. Some of the mechanisms involved in this drought resistance were analyzed in this study by imposing progressive water stress to pot-grown plants under glasshouse conditions. Water withholding for 53 days decreased soil water gravimetric content and the leaf water potential. Plant growth was negatively and significantly reduced by increasing soil water deficits. With irrigation suspension, carbon assimilation and transpiration were reduced and remained mostly constant throughout the... Tipo: Info:eu-repo/semantics/article Palavras-chave: A/Ci curves; Diurnal changes; Photosynthesis; Stomatal limitations; Water stress. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000300008 CO2 assimilation, photosynthetic light response curves, and water relations of 'Pêra' sweet orange plants infected with Xylella fastidiosa Braz. J. Plant Physiol. Habermann,Gustavo; Machado,Eduardo Caruso; Rodrigues,João Domingos; Medina,Camilo Lázaro. Plants with citrus variegated chlorosis (CVC), a disease caused by the xylem-limited bacteria Xylella fastidiosa, have leaves with water deficiency symptoms and are associated with decreases on the net photosynthesis and transpiration rates. Using healthy and CVC-affected 'Pêra' sweet orange plants on 'Rangpur' lime rootstock, the leaf gas exchange variables were measured with an open-gas portable photosynthesis system. All plants were watered and the leaf water potential (Yw) was measured by isopiestic thermocouple psychrometric technique. The net photosynthesis (A) vs. internal leaf CO2 concentration (A/Ci curves) was analyzed. The relative effect of stomatal resistance on photosynthesis (S%) and the estimation of carboxylation efficiency were... Tipo: Info:eu-repo/semantics/article Palavras-chave: A/Ci curves; Citrus variegated chlorosis; Citrus sinensis L. Osbeck; Photosynthetic photon flux density; Photosynthetic metabolism; Stomata. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000200003 Limitations to photosynthesis at different temperatures in the leaves of Citrus limon Braz. J. Plant Physiol. Pimentel,Carlos; Bernacchi,Carl; Long,Steve. The response of CO2 assimilation rate (A) to the intercellular partial pressure of CO2 (Ci) was measured on intact lemon leaves over a range of temperatures (10 to 40ºC). The A/Ci response shows how change in the leaf temperature alters the activity of ribulose-1,5-bisphosphate (RuBP) carboxylase-oxygenase (Rubisco) and RuBP regeneration via electron transport. The rate of A reached a maximum of 7.9 to 8.9 µmol m-2 s-1 between 25 and 30ºC, while dark respiration (Rd) increased with temperature from 0.4 µmol m-2 s-1 at 10ºC to 1.4 µmol m-2 s-1 at 40ºC. The maximum rates of carboxylation (Vc,max) and the maximum rates of electron transport (Jmax) both increased over this temperature range from 7.5 to 142 µmol m-2 s-1 and from 23.5 to 152 µmol m-2 s-1,... Tipo: Info:eu-repo/semantics/article Palavras-chave: A/Ci curves; Gas exchange; Lemon. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000200006 Registros recuperados: 3 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco