Early effects of salinity on nitrate assimilation in barley seedlings.

摘要: The effect of NaCl and Na 2 SO 4 salinity on NO 3 − assimilation in young barley ( Hordeum vulgare L. var Numar) seedlings was studied. induction the transporter affected very little; major salts its activity. Both Cl 2− severely inhibited uptake . When compared basis osmolality solutions, were more inhibitory (15-30%) than salts. At equal concentrations, 30 to 40% did absolute concentrations each ion seemed important as inhibitors solutions. K + similarly; hence, process sensitive anionic cationic salinity. Unlike uptake, reduction not by short-term studies (12 hours). rate endogenous leaves grown for 8 days decreased only 25%. Nitrate reductase activity salt-treated also 20% but activity, determined either vitro or `anaerobic9 vivo assay, always greater actual situ reduction. added assay medium, enzymic inhibited; whereas anaerobic nitrate slightly. These results indicate that is protected from salt injury. susceptibility injury transporter, rather system, may be a critical factor plant survival during stress.