Data/hora: 19/05/2024 01:58:39

Biblioteca(s): 	Embrapa Meio-Norte.	
Data corrente: 	16/04/1997	
Data da última atualização: 	16/04/1997	
Autoria: 	LOPEZ, F. B.; SETTER, T. L.; McDAVID, C. R.	
Título: 	Carbon dioxide and light responses of photosynthesis in cowpea and pigeonpea during water deficit and recovery.	
Ano de publicação: 	1987	
Fonte/Imprenta: 	Plant Physiology, v. 85, n. 4, p. 990-995, 1987.	
Idioma: 	Inglês	
Conteúdo: 	Greenhouse-grown pigeonpea (Cajanus cajan, [L.] Millsp.; cultivar UW-10) and cowpea (Vigna unguiculata [L.] Walp.; cultivar California No. 5) were well-watered (control) or subjected to low water potential by withholding water to compare their modes of adaptation to water-limited conditions. Leaf CO2 exchange rate (CER), leaf diffusive conductance to CO2 (gL), and CO2 concentration in the leaf intercellular air space (Ci) were determined at various CO2 concentrations and photon flux densities (PFD) of photosynthetically active radiation (400 to 700 nanometer). In cowpea, gL declined to less than 15% of controls and total water potential (Ww) at midafternoon declined to -0.8 megapascal after 5 days of withholding water, whereas gL in pigeonpea was about 40% ofcontrols even though midafternoon Ww was -1.9 megapascal. After 8 days of withholding water Ww at midafternoon declinet to -0.9 and -2.4 megapascals in cowpea and pigeonpea, respectively. The solute component of water potential (Ww) decreased substantially less in cowpea than pigeonpea. Photosynthetic CER at saturation photon flux density (PFD) and ambient external CO2 concentration (360 microliters per liter) on day 5 of withholding decreased by 83 and 55% in cowpea and pigeonpea, respectively. 	
Palavras-Chave: 	Caupi; Cowpea; Deficit hidrico.	
Thesagro: 	Cajanus Cajan; Fotossíntese; Guandu; Vigna Unguiculata.	
Thesaurus Nal: 	photosynthesis.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio-Norte (CPAMN)	
Exemplares: 	CPAMN - (3812-1) - ADC - SP - -- - S 10682 -  - S 10682 - DIS