Dosage de l'ion nitrate en solution nutritive et en présence de polyéthylène glycol par spectrométrie UV

Vercambre, Gilles; Adamowicz, Stéphane

doi:10.1051/agro:19960201

Cited by 11 publications

(4 citation statements)

References 15 publications

(15 reference statements)

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“…They were located in an underground laboratory where automatic devices maintained solutions at (i) 25 °C; (ii) volumes (optical sensors LLE 102000; Honeywell, Morristown, NJ, USA) of 0.5 m 3 (LN det), 0.3 m 3 (LN ind and HN det) or 0.08 m 3 (HN ind) by addition of deionised water; (iii) pH 5.0 by automatic addition of H 2 SO 4 ; (iv) by automatic injection (precision syringe drive PSD2, Hamilton Co., Reno, NV, USA) of a stock solution containing 1000 mol·m −3 , 408 mol·m −3 K + , 204 mol·m −3 Ca 2+ and 92 mol·m −3 Mg 2+ , thus ensuring major cation repletion. Nitrate concentration was measured by automatic online UV absorption spectrometry (double‐beam UVmc2; SAFAS, Monaco, France) derived from the method of Vercambre & Adamowicz (1996). Volume, pH and analyses and corrections were performed hourly using the Totomatix system described previously (Adamowicz et al.…”

Section: Methodsmentioning

confidence: 99%

Organ‐specific responses of tomato growth and phenolic metabolism to nitrate limitation

et al. 2012

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Phenolic compounds are secondary metabolites involved in plant innate chemical defence against pests and diseases. Their concentration varies depending on plant tissue and also on genetic and environmental factors, e.g. availability of nutrient resources. This study examines specific effects of low (LN) and high (HN) nitrogen supply on organ (root, stem and leaf) growth and accumulation of major phenolics [chlorogenic acid (CGA); rutin; kaempferol rutinoside (KR)] in nine hydroponically grown tomato cultivars. LN limited shoot growth but did not affect root growth, and increased concentrations of each individual phenolic in all organs. The strength of the response was organ-dependent, roots being more responsive than leaves and stems. Significant differences were observed between genotypes. Nitrogen limitation did not change the phenolic content in shoots, whereas it stimulated accumulation in roots. The results show that this trade-off between growth and defence in a LN environment can be discussed within the framework of the growth-differentiation balance hypothesis (i.e. GDBH), but highlight the need to integrate all plant organs in future modelling approaches regarding the impact of nitrogen limitation on primary and secondary metabolism.

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Section: Methodsmentioning

confidence: 99%

Organ‐specific responses of tomato growth and phenolic metabolism to nitrate limitation

et al. 2012

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“…Once a week, the volume and nutrient concentrations (K + , Ca 2+ , Mg 2+ , NO 3 -and H 2 PO 4 -) were measured. NO 3 -concentration was determined by a UV method (Lambda 2 UV/VIS Spectrometer, Perkin Elmer, Norwalk, USA) described by Vercambre and Adamowicz (1996). Water and nutrient salts were added in order to restore initial values.…”

Section: Nutritionmentioning

confidence: 99%

Influence of nitrogen availability on shoot development in young peach trees [ Prunus persica (L.) Batsch]

Médiène

Pagès

Jordan

et al. 2002

Trees

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It is commonly stated that nitrogen (N) influences biomass accumulation in plants. For trees, however, a precise characterisation of shoot response to N and its impact on architecture is lacking. We attempted to study on the phytomer scale the effects of N limitation on shoot growth components, i.e. leaf emergence rate, final internode length and branching on the main and secondary axes of 1-year-old peach trees [Prunus persica (L.) Batsch]. Trees were grown on recycled nutrient solutions in which N concentration was restored once a week. We used two hydroponic set-ups in which weekly N availability, i.e. amount of N per tree, differed being either low (N1) or high (N2). Net N availability was defined weekly as the relative amount of N remaining in each set-up before solution replenishment. It declined with time and three periods of contrasting net N availability were identified. During these periods, leaf emergence rate and final internode length were similar on the main axis of N1 and N2 trees, so too was the distribution of secondary axes along the main axis. Secondary axes responded to N limitation by decreasing their growth components according to their position along the main axis. Differences were most important for basal secondary axes. Leaf emergence rate and final internode length responded similarly to N availability depending on axis order and position in the tree. It was concluded that N availability, particularly during the period of maximum growth of axes, influenced the shoot growth components and thus tree architecture.

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“…Solution [] was measured using UV spectrometry (Vercambre & Adamowicz, 1996). Water extracts of dry plant tissues were tested for nitrate by nitrite colorimetry after reduction by cadmium (Aquatec 5500, Tecator, Höganäs, Sweden).…”

Section: Methodsmentioning

confidence: 99%

Altering young tomato plant growth by nitrate and CO₂preserves the proportionate relation linking long‐term organic‐nitrogen accumulation to intercepted radiation

Adamowicz

Bot

2008

New Phytologist

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Summary• A previously published model of crop nitrogen (N) status based on intercepted photosynthetically active radiation (R i , mol per plant) suggested that plant organic N accumulation is related to R i by a constant ratio, defined hereafter as the radiation use efficiency for N (NRUE). The aim of this paper was to compare the effects of N nutrition and CO 2 enrichment on NRUE and RUE (radiation use efficiency for biomass accumulation).• • It is suggested that the radiation efficiency for organic N acquisition (NRUE) did not depend on C or N nutrition for young plants grown under unstressed conditions.

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Dosage de l'ion nitrate en solution nutritive et en présence de polyéthylène glycol par spectrométrie UV

Cited by 11 publications

References 15 publications

Organ‐specific responses of tomato growth and phenolic metabolism to nitrate limitation

Organ‐specific responses of tomato growth and phenolic metabolism to nitrate limitation

Influence of nitrogen availability on shoot development in young peach trees [ Prunus persica (L.) Batsch]

Altering young tomato plant growth by nitrate and CO₂preserves the proportionate relation linking long‐term organic‐nitrogen accumulation to intercepted radiation

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Dosage de l'ion nitrate en solution nutritive et en présence de polyéthylène glycol par spectrométrie UV

Cited by 11 publications

References 15 publications

Organ‐specific responses of tomato growth and phenolic metabolism to nitrate limitation

Organ‐specific responses of tomato growth and phenolic metabolism to nitrate limitation

Influence of nitrogen availability on shoot development in young peach trees [ Prunus persica (L.) Batsch]

Altering young tomato plant growth by nitrate and CO2preserves the proportionate relation linking long‐term organic‐nitrogen accumulation to intercepted radiation

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Altering young tomato plant growth by nitrate and CO₂preserves the proportionate relation linking long‐term organic‐nitrogen accumulation to intercepted radiation