Data/hora: 10/06/2024 17:24:59

Biblioteca(s): 	Embrapa Mandioca e Fruticultura.	
Data corrente: 	24/02/1992	
Data da última atualização: 	24/02/1992	
Autoria: 	GUZMAN, R. G.; EI-SHARKWY, M.	
Afiliação: 	Universidade Javeriana A.A. 094770 Bogota.; CIAT A.A. 6713 Cali, Colombia.	
Título: 	Efecto de la Disponibilidad Hidrica del Suelo sobre la Anatomia Foliar y el Intercambio Gaseoso de dos Cultivares de Yuca (Manihot esculenta Crantz).	
Ano de publicação: 	1989	
Fonte/Imprenta: 	Revista Comalfi, v.16, n.3, p.11-18, 1989.	
Páginas: 	p. 11-18	
Idioma: 	Outros	
Conteúdo: 	Using the infra-red gas analysis system, the rate of CO2 uptake, transpiration, leaf conductance and water use efficiency were determined on attached leaves of cvs. MCol 1522 and CG 403-18 which were grown in pots left outdoors. In the stress treatment, the water was withheld from the fourth to eighth week after planting. Under Water stress, the photosynthetic rates were greatly reduced at all light intensities in both cultivars. The reduction in photosynthesis corresponded to reduction in stomatal conductance. In irrigated plants the maximun photosynthesis was obtained at light intensity of 1400 E/m2 seg. On the other hand , the maximum photosynthesis in the stresse plants, was reached at about 500 E/m2 seg. The maximum water use efficiency (mgCO2/gH2O) was obtained at 200 and 400 E/m2 in stressed and wellwatered plants, respectively. However, cv. Mcol 1522 was more tolerant to water stress than cv. CG 403-18. Under water stress, the leaf thickness in diferent positions on the plants in both cultivars was significantly reduced (p=0.05) and the ratio of palisade/spongy tissue was increased. These changes in leaf anatomy could be a form of adaptation to water shortage and might enhance the CO2 uptake under these conditions.	
Palavras-Chave: 	Uso.	
Thesagro: 	Álcool; Amido; Combustível; Produção; Raiz; Tecnologia.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Mandioca e Fruticultura (CNPMF)	
Exemplares: 	CNPMF - (15504-1) - ADC - SP - -- - S3435 -  - S3435 - DIS