Varying leaf-to-fruit ratios affect branch growth and dieback, with little to no effect on photosynthesis, carbohydrate or mineral pools, in different canopy positions of field-grown coffee trees.

CHAVES, A. R. de M.; MARTINS, S. C. V.; BATISTA, K. D.; CELIN, E. F.; MATTA, F. M. da

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Campo DC	Valor	Lengua/Idioma
dc.contributor.author	CHAVES, A. R. de M.	pt_BR
dc.contributor.author	MARTINS, S. C. V.	pt_BR
dc.contributor.author	BATISTA, K. D.	pt_BR
dc.contributor.author	CELIN, E. F.	pt_BR
dc.contributor.author	MATTA, F. M. da	pt_BR
dc.date.accessioned	2012-03-19T11:11:11Z	pt_BR
dc.date.available	2012-03-19T11:11:11Z	pt_BR
dc.date.created	2012-03-19	pt_BR
dc.date.issued	2012	pt_BR
dc.identifier.citation	Environmental and Experimental Botany, v. 77, p. 207?218, 2012.	pt_BR
dc.identifier.uri	http://www.alice.cnptia.embrapa.br/alice/handle/doc/919316	pt_BR
dc.description	Heavy bearing is a typical phenomenon on unshaded coffee (Coffea arabica L.) trees and limits both the production and retention of leaves, leading to branch dieback, and, thus, results in a strong biennial bearing pattern. The major goals of this study were to investigate the physiological mechanisms that may be associated with the leaf-to-fruit ratio (LFR), branch dieback, biennial production and the relationships between carbohydrate and mineral fluctuations and branch dieback in coffee plants. The trees were grown in north?south-oriented hedgerows under conditions of full sunlight. Leaves and plagiotropic branches from the upper and lower strata of the east- and west-facing sides of the hedgerow were examined. A strong biennial pattern of coffee production was observed over three harvests. Overall, the east face of the hedgerow produced a more sellable crop than the west face, and this was associated with more light availability for the east-facing branches. The branch growth rate was higher with an increasing LFR during 2006?2007, regardless of the canopy position, and no compensatory increase in the photosynthetic rate was found in response to a decreasing LFR. Due to a relatively low fruit yield in 2007?2008, there was no branch dieback. The extent of branch dieback increased dramatically with decreasing LFR and was probably not closely related to changes in the concentrations of carbohydrates, amino acids and minerals. The extent of branch dieback was apparently unrelated to the differences in the photosynthetic rates per unit leaf area, carbon isotope composition, or oxidative stress, as was assessed by the electrolyte leakage from the leaf tissues. We discuss these responses in terms of the relative lack of branch autonomy in coffee trees.	pt_BR
dc.language.iso	eng	eng
dc.rights	openAccess	eng
dc.subject	Cultivo	pt_BR
dc.title	Varying leaf-to-fruit ratios affect branch growth and dieback, with little to no effect on photosynthesis, carbohydrate or mineral pools, in different canopy positions of field-grown coffee trees.	pt_BR
dc.type	Artigo de periódico	pt_BR
dc.date.updated	2012-04-09T11:11:11Z	pt_BR
dc.subject.thesagro	Café	pt_BR
dc.subject.thesagro	Crescimento	pt_BR
dc.subject.thesagro	Fotossíntese	pt_BR
riaa.ainfo.id	919316	pt_BR
riaa.ainfo.lastupdate	2012-04-09	pt_BR
dc.contributor.institution	AGNALDO RODRIGUES DE MELO CHAVES, CPATSA; SAMUEL C. V. MARTINS; KARINE D. BATISTA; ELAINE F. CELIN; FÁBIO M. DA MATTA.	pt_BR
Aparece en las colecciones:	Artigo em periódico indexado (CPATSA)

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