Data/hora: 28/05/2024 12:52:25

Biblioteca(s): 	Embrapa Meio-Norte.	
Data corrente: 	11/04/1997	
Data da última atualização: 	11/04/1997	
Autoria: 	ORTIZ, A.; MARTINEZ, V.; CERDA, A.	
Título: 	Effects of osmotic shock and calcium on growth and solute composition of Phaseolus vulgaris plants.	
Ano de publicação: 	1994	
Fonte/Imprenta: 	Physiologia Plantarum, v. 91 n. 3, p. 468-476, 1994.	
Idioma: 	Inglês	
Conteúdo: 	Identification of the primary response to salinity is of great importance in order to develop salt tolerant species. In this work the effect of a NaCl osmotic shock on leaf elongation of Phaseolus vulgaris L.  cv. Contender has been studied. After establishing an osmotic shock by adding NaCl to the root medium three consecutive events could be distinguished. First, there was a sudden  interruption of leaf growth, followed by a period of retardation of growth, to reach the steady-state growth rate. High calcium (5 mM) in the growth medium diminished the initial loss of water in the roots and kept the water content higher upon restoration of leaf growth, as compared to low calcium levels (0,5 mM). During the low calcium treatment, leaf malate started to  increase already 3 h after the start of the osmotic treatment, showing a maximum concentration at around 9 h, then decreasing and approaching the value of control plants. At high calcium, malate concentration remained unchanged with time. Plants grown in the presence of low calcium showed an increase in the concentration of total amino acids upon NaCl shock. It is estimated that organic metabolites, in confined to the cell cytoplasm, contribute significantly to the osmotic adjustment, together with inorganic ions. Our results support the hypothesis that water shortage in the roots is responsible for the initial inhibition of leaf elongation.	
Palavras-Chave: 	Bean; GLC; Mineral nutrition; Nutricao mineral; Organic solutes.	
Thesagro: 	Feijão; Osmose; Phaseolus Vulgaris; Salinidade.	
Thesaurus Nal: 	salinity.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio-Norte (CPAMN)	
Exemplares: 	CPAMN - (4505-1) - ADC - SP - -- - S 10643 -  - S 10643 - DIS