Data/hora: 23/09/2024 16:11:18

Biblioteca(s): 	Embrapa Cerrados; Embrapa Recursos Genéticos e Biotecnologia.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	A - 1	
Data corrente: 	20/12/2010	
Data da última atualização: 	08/08/2024	
Autoria: 	ANDRADE, L. R. M. de; BARROS, L. M. G.; ECHEVARRIA, G. F.; AMARAL, L. I. V.; COTTA, M. G.; ROSSATO, D. R.; HARIDASAN, M.; FRANCO, A. C.	
Afiliação: 	LEIDE ROVENIA MIRANDA DE ANDRADE, CPAC; LEILA MARIA GOMES BARROS, CENARGEN; GUILLAUME FERNANDES ECHEVARRIA, INRA; LOURDES I. VELHO DO AMARAL, UNB; MICHELLE G. COTTA, ESTAGIARIA CENARGEN; DAVI RODRIGO ROSSATO, UNB; MUNDAYATAN HARIDASAN, UNB; AUGUSTO CÉSAR FRANCO, UNB.	
Título: 	Al-hyperaccumulator vochysiaceae from the Brazilian Cerrado store aluminum in their chloroplasts without apprent damage.	
Ano de publicação: 	2011	
Fonte/Imprenta: 	Environmental and experimental botany, v. 70, p. 37-42, 2011.	
DOI: 	10.1016/j.envexpbot.2010.05.013	
Idioma: 	Inglês	
Conteúdo: 	We investigated the pattern of aluminum (Al) accumulation in leaf tissues of native hyperaccumulator Vochysiaceae species Qualea grandiflora, Callisthene major, and Vochysia pyramidalis, from the Brazilian Cerrado. Non-accumulator Sclerolobium paniculatum was used as a control species. We expected a strong compartmentalization of Al in non-active leaf cell compartments such as cell walls and vacuoles in Al- accumulating species and the absence of Al in critical metabolic sites such as the chloroplasts. Plant leaves were harvested in the field and cut in small segments for histological analysis; hematoxylin dye was used for Al localization in tissues. Results of soil analysis of the three sites and the concentration of Al in leaves indicated that there is no direct relationship between Al availability in soils and Al hyperaccumulation among the Vochysiaceae species evaluated. The cross-sections of leaf tissues showed hematoxylin color in the palisade and spongy parenchyma cells (chloroplast) of Q. grandiflora and C. major. The vascular system of Q. grandiflora was not colored, but some cells from the xylem region of C. major were stained. In contrast, the adaxial and abaxial epidermal cells of V. pyramidalis were colored by hematoxylin, as were some cells from the vascular bundle, but color formation was not observed in the cells of palisade parenchyma. Al was not detected in leaves of S. paniculatum. We concluded that, although hyperaccumulation of Al is a common trait in the Vochysiaceae family, the processes of storage and detoxification in leaf tissues differ among the species. Two of the three hyperaccumulator species use chloroplasts as a sink for Al, with no apparent signs of toxicity. Therefore, the physiological role of Al in plant tissues remains to be elucidated.	
Palavras-Chave: 	Alluminum accumulation; Planta acumuladora.	
Thesagro: 	Cerrado.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (32278-1) - UPC - AP - PP - CRI1117 -  - CRI1117 - DIS
CENARGEN - (33606-1) - UPC - AP - DD -  -  -  - DIS