Nitrate and Ammonium Nutrition of Plants: Physiological and Molecular Perspectives

Forde, Brian G.; Clarkson, David T.

doi:10.1016/s0065-2296(08)60226-8

Cited by 290 publications

(205 citation statements)

References 316 publications

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“…Increased cycling of the free amino acid pool resulting from an increase of the proteolysis in senescing foliar tissues, especially at flowering, could repress HATS and LATS activities. It is well known that NO 3 Ϫ uptake is feedback regulated by free amino acid compounds in many species at physiological and molecular levels (Forde and Clarkson, 1999;Zhuo et al, 1999). For example, Vidmar et al (2000) demonstrated that treatment of root tissue with an inhibitor of Glu synthase led to an increase of root Gln concentration and a concomitant decrease of the HvNRT2 transcript level of 97% in barley.…”

Section: Effect Of Endogenous and Environmental Factors On No 3 ؊ Influxmentioning

confidence: 99%

Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

Malagoli¹,

Laîné²,

Deunff³

et al. 2004

Plant Physiology

115

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The use of kinetic equations of NO 3 Ϫ transport systems in oilseed rape (Brassica napus), determined by 15 NO 3 Ϫ labeling under controlled conditions, combined with experimental field data from the INRA-Châlons rape database were used to model NO 3 Ϫ uptake during the plant growth cycle. The quantitative effects of different factors such as day/night cycle, ontogenetic stages, root temperature, photosynthetically active radiation, and soil nitrate availability on different components of the constitutive high-affinity transport systems, constitutive low-affinity transport systems, inducible low-affinity transport systems, and inducible high-affinity transport systems of nitrate were then determined to improve the model's predictions. Simulated uptake correlated well with measured values of nitrogen (N) uptake under field conditions for all N fertilization rates tested. Model outputs showed that the high-affinity transport system accounted for about 89% of total NO 3 Ϫ uptake (18% and 71% for constitutive high-affinity transport systems and inducible high-affinity transport systems, respectively) when no fertilizer was applied. The low-affinity transport system accounted for a minor proportion of total N uptake, and its activity was restricted to the early phase of the growth cycle. However, N fertilization in spring increased the duration of its contribution to total N uptake. Overall, data show that this mechanistic and environmentally regulated approach is a powerful means to simulate total N uptake in the field with the advantage of taking both physiologically regulated processes at the overall plant level and specific nitrate transport system characteristics into account.Winter oilseed rape (Brassica napus) is an important crop in northern Europe because of its varied utilizations (oil and biofuel). However, yields remain highly variable. As a consequence, oilseed rape has been extensively studied to identify key components of yield and to improve them by more effective nitrogen (N) application with the target of reducing environmental impacts such as N leaching and improving N use efficiency for seed filling (Boelcke et al., 1991;Habekotté, 1993;Schjoerring et al., 1995;Sieling and Christen, 1997;Vos and van der Putten, 1997). Many mathematical models have been built to simulate crop growth, development, and yield (BRASNAP-PH, Habekotté, 1997a; and LINTUL BRASNAP, Habekotté, 1997b). Some of these (DAISY, Petersen et al., 1995; and CERES-Rape, Gabrielle et al., 1998) have been devoted mainly to predicting ecological impacts of N losses from winter oilseed rape. When N nutrition has been taken into account, N uptake usually has been based on the balance of demand and supply. In this context, N availability in the soil solution is modeled using mass flow and NO 3 Ϫ diffusion equations (CERES-Rape, and DAISY), and N demand is often determined using the critical dilution curve determined by Colnenne et al. (1998) for oilseed rape (CERES-rape). In these models, the root system is considered as a "black box." ...

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Section: Effect Of Endogenous and Environmental Factors On No 3 ؊ Influxmentioning

confidence: 99%

Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

Malagoli¹,

Laîné²,

Deunff³

et al. 2004

Plant Physiology

115

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“…It is taken up from the soil by active transporters in the plasma membranes of root cells. Measurements of NO 3 3 in£ux kinetics have shown that the roots possess at least three NO 3 3 transport systems (see for review [1,2]) : (i) a low-a¤nity transport system (LATS) which is active at external NO 3 3 concentrations s 0.5 mM and displays a linear kinetics ; (ii) a constitutive high-a¤nity transport system (cHATS) with K m values of 6^20 WM and V max values of 0.3^0.82 Wmol h 31 g 31 root fresh weight and (iii) an inducible higha¤nity transport system (iHATS), which is activated within the ¢rst hours of exposition to NO 3 3 (K m and V max values of 13^79 WM and 3^8 Wmol h 31 g 31 root fresh weight, respectively). In recent years, many genes or cDNAs involved in these NO 3 3 transport systems have been isolated (see for reviews [3,4]).…”

Section: Introductionmentioning

confidence: 99%

An Arabidopsis T‐DNA mutant affected in Nrt2 genes is impaired in nitrate uptake

Filleur¹,

Dorbe²,

Cerezo³

et al. 2001

FEBS Letters

286

237

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Expression analyses of Nrt2 plant genes have shown a strict correlation with root nitrate influx mediated by the highaffinity transport system (HATS). The precise assignment of NRT2 protein function has not yet been possible due to the absence of heterologous expression studies as well as loss of function mutants in higher plants. Using a reverse genetic approach, we isolated an Arabidopsis thaliana knock-out mutant where the T-DNA insertion led to the complete deletion of the AtNrt2.1 gene together with the deletion of the 3P P region of the AtNrt2.2 gene. This mutant is impaired in the HATS, without being modified in the low-affinity system. Moreover, the deregulated expression of a Nicotiana plumbaginifolia Nrt2 gene restored the mutant nitrate influx to that of the wild-type. These results demonstrate that plant NRT2 proteins do have a role in HATS. ß

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“…Cataldo et al, 1983). However, we suggest that as NO (Forde and Clarkson, 1999). This might contribute to the lower uptake of TcO Ϫ 4 reported from anaerobic soils.…”

Section: Tc Uptake and Nitrate Transportmentioning

confidence: 69%

“…A number of nitrate transport proteins have now been isolated from plants (Crawford and Glass, 1998;Forde and Clarkson, 1999) (Fig. 1).…”

Section: Tc Uptake and Nitrate Transportmentioning

confidence: 99%

Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

Bennett

Willey

2003

Journal of Environmental Radioactivity

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Nitrate and Ammonium Nutrition of Plants: Physiological and Molecular Perspectives

Cited by 290 publications

References 316 publications

Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

An Arabidopsis T‐DNA mutant affected in Nrt2 genes is impaired in nitrate uptake

Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

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