Nitrate uptake, xylem NO3- flux, and nitrate assimilation in cowpea exposed to salinity
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چکیده
منابع مشابه
Cation Pretreatment Effects on Nitrate Uptake, Xylem
Week-old wheat seedlings absorbed at least 40% NO3from NaNO3 when preloaded with K+ than when preloaded with Na+ or Ca2". Cultures of Tnticum vulgare L. cv. Arthur were grown for 5 days on 0.2 ,M CaSO4, pretreated for 48 hours with either 1 mM CaSO4, K2SO4, or Na2SO4, and then transferred to 1 mM NaNO3. All solutions contained 0.2 mM CaSO4. Shoots of K+-preloaded plants accumulated three times ...
متن کاملRoot respiration associated with nitrate assimilation by cowpea.
Nitrate uptake by roots of cowpea (Vigna unguiculata) was measured using (15)NO(3) (-), and the energy cost to the root was estimated by respirometry. Roots of 8-day-old cowpea seedlings respired 0.6 to 0.8 milligram CO(2) per plant per hour for growth and maintenance. Adding 10 millimolar NO(3) (-) to the root medium increased respiration by 20 to 30% during the following 6 hours. This increas...
متن کاملIntegrating fluctuating nitrate uptake and assimilation to robust homeostasis.
Nitrate is an important nitrogen source used by plants. Despite of the considerable variation in the amount of soil nitrate, plants keep cytosolic nitrate at a homeostatic controlled level. Here we describe a set of homeostatic controller motifs and their interaction that can maintain robust cytosolic nitrate homeostasis at fluctuating external nitrate concentrations and nitrate assimilation le...
متن کاملNitrate Uptake and Assimilation by Wheat Seedlings during Initial Exposure to Nitrate.
Nitrate uptake, reduction, and translocation were examined in intact, 14-day-old, nitrogen-depleted wheat (Triticum vulgare var. Knox) seedlings during a 9-hour exposure to 0.2 mm Ca (NO(3))(2). The nitrate uptake rate was low during the initial 3-hour period, increased during the 3- to 6-hour period, and then declined. By the 3rd hour, 14% of the absorbed nitrate had been reduced, and this inc...
متن کاملEarly effects of salinity on nitrate assimilation in barley seedlings.
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. The induction of the NO(3) (-) transporter was affected very little; the major effect of the salts was on its activity. Both Cl(-) and SO(4) (2-) salts severely inhibited uptake of NO(3) (-). When compared on the basis of osmolality of the uptake solutions, ...
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ژورنال
عنوان ژورنال: REVISTA CIÊNCIA AGRONÔMICA
سال: 2010
ISSN: 1806-6690
DOI: 10.5935/1806-6690.20100014