Modelling Diurnal Nitrate Uptake in Young Tomato (Lycopersicon Esculentum Mill.) Plants Using a Homoeostatic Model

Navarro, Raúl Cárdenas; Adamowicz, Stéphane; Robin, Paul

doi:10.17660/actahortic.1998.456.28

Cited by 5 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This finding was surprising. As nitrate functions as a regulator of osmotic pressure [26][27][28], higher contents at lower light levels were expected, as described by others [28][29][30][31][32][33]. However, a study with lettuce [34] did not show any clear relationship between nitrate content and daylight integral.…”

Section: Discussionmentioning

confidence: 69%

Effect of Light Intensity and Spectra on Inorganic Constituents in Vietnamese Coriander (Persicaria odorata (Lour.) Soják)

et al. 2023

View full text Add to dashboard Cite

With the aim of optimizing resources in regional production of nutritive valuable leafy vegetables, this study was conducted to obtain more knowledge regarding the interdependencies between light conditions and accumulation of inorganic constituents. The test plant, P. odorata, was cultivated in a climate chamber with fluorescent tubes as the main light source and daylight integrals (DLI) varying between 4.68 and 9.06 mol·m−2·day−1. The average DLI in greenhouse experiments was 41.55 mol·m−2·day−1. Light conditions were modified using additional LEDs (443, 515, and 629 nm) or by covering the plants with photoselective plastic films, leading to a lower DLI and modified light spectrum, especially by reducing the green spectral range. Contents of nitrate, phosphorus, potassium, magnesium, calcium, and iron, biomass accumulation, and water content were analyzed. In terms of particular light modifications, additional green (515 nm) and red (629 nm) LEDs showed reducing effects on nitrate content at both cultivation locations. Other inorganic constituents were affected differently depending on cultivation location. However, the calculation of average partial correlation coefficients enabled a more general statement. Increasing DLI correlated positively with contents of magnesium, nitrate, and potassium but negatively with contents of calcium and iron. Additionally, nitrate content correlated positively with the spectral range of 651–700 nm but negatively with the R:FR ratio. Consequently, a general recommendation related to the light conditions is not possible, as inorganic constituents were affected differently. Nevertheless, as the nitrate content in leafy vegetables is of high concern and was reduced by higher shares of green or red light, this might be one way to regulate nitrate content in leafy vegetables.

show abstract

Section: Discussionmentioning

confidence: 69%

Effect of Light Intensity and Spectra on Inorganic Constituents in Vietnamese Coriander (Persicaria odorata (Lour.) Soják)

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Once N-starved cassava plants were exposed to NO 3 – , MeNPF4.5 expression first increased and then decreased ( Figure 2A ). It can be seen that MeNPF4.5 responds to NO 3 – in the short term like many other plants NRT1.1 ( Cárdenas Navarro et al, 1998 ; Okamoto et al, 2003 ; Wang et al, 2007 ). In addition to being expressed in roots, AtNRT1.1 is also expressed in shoots, young leaves, and developing flower buds of Arabidopsis , but it is more strongly expressed in roots ( Miller et al, 2007 ; Sakuraba et al, 2021 ).…”

Section: Discussionmentioning

confidence: 84%

MeNPF4.5 Improves Cassava Nitrogen Use Efficiency and Yield by Regulating Nitrogen Uptake and Allocation

Liang

Dong

et al. 2022

Front. Plant Sci.

View full text Add to dashboard Cite

Improving nitrogen use efficiency (NUE) is a very important goal of crop breeding throughout the world. Cassava is an important food and energy crop in tropical and subtropical regions, and it mainly use nitrate as an N source. To evaluate the effect of the nitrate transporter gene MeNPF4.5 on the uptake and utilization of N in cassava, two MeNPF4.5 overexpression lines (MeNPF4.5 OE-22 and MeNPF4.5 OE-34) and one MeNPF4.5 RNA interference (RNAi) line (MeNPF4.5 Ri-1) were used for a tissue culture experiment, combining with a field trial. The results indicated that MeNPF4.5 is a plasma membrane transporter mainly expressed in roots. The gene is induced by NO3–. Compared with the wild type, MeNPF4.5 OE-22 exhibited improved growth, yield, and NUE under both low N and normal N levels, especially in the normal N treatment. However, the growth and N uptake of RNAi plants were significantly reduced, indicating poor N uptake and utilization capacity. In addition, photosynthesis and the activities of N metabolism-related enzymes (glutamine synthetase, glutamine oxoglutarate aminotransferase, and glutamate dehydrogenase) of leaves in overexpression lines were significantly higher than those in wild type. Interestingly, the RNAi line increased enzymatic activity but decreased photosynthesis. IAA content of roots in overexpressed lines were lower than that in wild type under low N level, but higher than that of wild type under normal N level. The RNAi line increased IAA content of roots under both N levels. The IAA content of leaves in the overexpression lines was significantly higher than that of the wild type, but showed negative effects on that of the RNAi lines. Thus, our results demonstrated that the MeNPF4.5 nitrate transporter is involved in regulating the uptake and utilization of N in cassava, which leads to the increase of N metabolizing enzyme activity and photosynthesis, along with the change of endogenous hormones, thereby improving the NUE and yield of cassava. These findings shed light that MeNPF4.5 is involved in N use efficiency use in cassava.

show abstract

Effects of Nitrogen Source on Growth and Development of Strawberry Plants

Cárdenas‐Navarro

López-Pérez

Lobit

et al. 2006

Journal of Plant Nutrition

View full text Add to dashboard Cite

An experiment was conducted to study the effects of nitrate (NO − 3 ) and ammonium (NH + 4 ) ratios in nutrient solutions on the growth and production of fruits, runners, and daughter plants of strawberry Fragaria x ananassa Duch., grown in a hydroponic system. Five treatments were applied, consisting of different proportions of NH + 4 and NO − 3 in the nutrient solution. The NH + 4 :NO − 3 ratios were: T0 = 0:4, T1 = 1:3, T2 = 2:2, T3 = 3:1, and T4 = 4:0, at a constant nitrogen (N) concentration of 4 mol m −3 . Growth and morphogenesis were characterized by monitoring leaf-area increase, number of flowers and fruits per plant, and number of daughter plants of first and second generations. Nitrogen and carbon (C) content were measured at the end of the experiment in the organs of both mother and daughter plants. None of the variables related to the growth of the mother plant was affected by the treatments. However, the number of fruits increased with the proportion of NH + 4 in the nutrient solution. The number of daughter plants produced was affected only at high NH + 4 proportions, and their size (dry matter per daughter plant) and fertility (number of second-generation plants per first-generation plants) were reduced. The N or C content of the plants was not significantly affected by the treatments, but the C/N ratio in the crowns of mother plants was higher in treatments with 25% and 50% NH + 4 in the nutrient solution.

show abstract

Modelling Diurnal Nitrate Uptake in Young Tomato (Lycopersicon Esculentum Mill.) Plants Using a Homoeostatic Model

Cited by 5 publications

References 0 publications

Effect of Light Intensity and Spectra on Inorganic Constituents in Vietnamese Coriander (Persicaria odorata (Lour.) Soják)

Effect of Light Intensity and Spectra on Inorganic Constituents in Vietnamese Coriander (Persicaria odorata (Lour.) Soják)

MeNPF4.5 Improves Cassava Nitrogen Use Efficiency and Yield by Regulating Nitrogen Uptake and Allocation

Effects of Nitrogen Source on Growth and Development of Strawberry Plants

Contact Info

Product

Resources

About