Data/hora: 24/09/2024 21:45:03

Biblioteca(s): 	Embrapa Gado de Corte.	
Data corrente: 	14/11/2017	
Data da última atualização: 	14/11/2017	
Autoria: 	VIEIRA, E. A.; SILVA, M das G.; MORO, C. F.; LAURA, V. A.	
Afiliação: 	Evandro Alves Vieira, Instituto de Botânica, S~ao Paulo, SP, Brazil; Maria das Graças Silva, Universidade Estadual de Mato Grosso do Sul, Coxim, MS, Brazil; Camila Fernandes Moro, Universidade Estadual de Campinas, Campinas, SP, Brazil; VALDEMIR ANTONIO LAURA, CNPGC.	
Título: 	Physiological and biochemical changes attenuate the effects of drought on the Cerrado species Vatairea macrocarpa (Benth.) Ducke.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Plant Physiology and Biochemistry, v. 115, p. 472-483, Jun. 2017.	
DOI: 	10.1016/j.plaphy.2017.04.022	
Idioma: 	Inglês	
Conteúdo: 	Drought is considered the main abiotic stress because it influences the distribution of plant species and limits the productivity of ecosystems. The aim of this study was to evaluate the effects of drought on physiological and biochemical parameters during the initial development of Vatairea macrocarpa, a native cerrado species. Plants were subjected to daily watering (control); suppression of watering during 90 days with field capacity (fc) 50% and 25% and then followed by rewatering. Relative leaf water content (RWC), gas exchange, photosynthetic pigments content, carbohydrate and amino acids content, antioxidant activities and growth were recorded. The RWC decreased according to the soil water restriction, causing reduction in stomatal conductance and decrease of 76.4% in net photosynthesis in plants submitted to 25% fc. Water restriction decreased the chlorophyll content, however increased carotenoid content and also improved the antioxidant activities of superoxide dismutase (SOD), ascorbate peroxidase (APX) and catalase (CAT). In addition, high levels of sugars (sucrose, raffinose) and amino acids (proline, tryptophan, valine, glutamine and GABA) were detected in drought stressed plants, contributing to osmoregulation and as sources of carbon and nitrogen after rehydration. Decreases in carbon assimilation promoted a reduction of the leaf area, however an increase in the root surface area was observed. After rewatering, the analized parameters became similar to the control plants indicating that the severe water stress did not impair the survival of young plants. Instead, adjustments were made to protect them against drought such as the maintenance of the assimilatory metabolism at minimal levels.	
Palavras-Chave: 	Stomatal resistance; Vatairea macrocarpa; Water deficit plant.	
Thesagro: 	Cerrado.	
Thesaurus Nal: 	Amino acids; Osmoregulation; Photosynthesis; Raffinose; Specific growth rate; Sucrose.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/166695/1/Physiological-and-biochemical-changes.pdf	
Registro original: 	Embrapa Gado de Corte (CNPGC)	
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