Data/hora: 17/06/2024 16:05:57

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	06/06/2005	
Data da última atualização: 	06/06/2005	
Autoria: 	PURCELL, L. C.; SINCLAIR, T. R.	
Título: 	Soybean (Glycine max) nodule physical traits associated with permeability responses to oxygen.	
Ano de publicação: 	1993	
Fonte/Imprenta: 	Plant Physiology, Bethesda, v. 103, n. 1, p. 149-156, 1993.	
Idioma: 	Inglês	
Conteúdo: 	The hypothesis that modulation of water volume in the intercellular spaces of the nodule cortex changes the effective thickness of a diffusion barrier and accounts for changes in nodule permeability (P) was examined by evaluating physical traits of soyabean nodules. The density of nodules exposed to 21 kPa O2 increased as the time after detachment from the plant increased from 5 to 60 min. Nodules from plants shaded for 48 h had a lower fractional air space content than nodules from unshaded plants. P was decreased by nodule detachment and plant shading; in association with the changes in density and fractional air space, this supported the proposed hypothesis. Pressure-volume analysis determined that the intrinsic capacitance of nodules was 0.29 MPa-1, indicating that the tissue can release relatively large amounts of water from the symplast with only small changes in total nodule water potential. Estimates of the bulk modulus of elasticity ranged from 0.91 to 2.60 MPa and indicated a high degree of elasticity. It was concluded that the physical properties of nodules were consistent with P modulation by the release and uptake of intercellular water in the nodule cortex.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)	
Exemplares: 	CNPSO - (25076-1) - ADD - SP - -- - 9493 -  - 9493 - DIS