Urea Use Efficiency of Hydroponically Grown Maize and Wheat

Mérigout, Patricia; Gaudon, Virginie; Quilleré, Isabelle; Briand, Xavier

doi:10.1080/01904160801894970

Cited by 35 publications

(21 citation statements)

References 22 publications

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“…4,[6][7][8]39 Several authors have demonstrated that the root exposure to a combination of different N sources, led to positive effects on the nutritional status of crop plants. 6,7,40,41 In long term, the presence of both urea and nitrate enhanced plant growth 6,8 and the relative use of each N-source 7 as compared to nitrate or, especially, to urea, when provided alone.…”

Section: Physiological and Transcriptional Changes Occurring Under Urmentioning

confidence: 99%

“…5 To improve the comprehension and the optimization of N nutrition in plants, a research topic of great relevance is the study of the interactions among different N-sources on the root uptake; however up to date only few works have investigated this topic. 4,[6][7][8] The present review focuses on recent evidence about the acquisition of two major N-forms, urea and nitrate, and on the reciprocal influence of these two sources on their root uptake systems.…”

mentioning

confidence: 99%

“…Three main N forms are present in soil as native sources or as applied fertilizers (ammonium, nitrate and urea) and, at least for a short time, plant roots are exposed to a combination of all these three N sources. 4 Nevertheless, their relative amount and bioavailability under field conditions are obviously influenced by biogeochemical reactions. 5 To improve the comprehension and the optimization of N nutrition in plants, a research topic of great relevance is the study of the interactions among different N-sources on the root uptake; however up to date only few works have investigated this topic.…”

mentioning

confidence: 99%

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Molecular and physiological interactions of urea and nitrate uptake in plants

Pinton

Tomasi

Zanin

2016

Plant Signaling & Behavior

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Section: Physiological and Transcriptional Changes Occurring Under Urmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Molecular and physiological interactions of urea and nitrate uptake in plants

Pinton

Tomasi

Zanin

2016

Plant Signaling & Behavior

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“…We previously demonstrated that in our hydroponic culture conditions, urea is not hydrolyzed in the nutrient solution (Merigout et al, 2008). In order to characterize the effect of urea on Arabidopsis growth and metabolism, plants were grown in a nutrient solution containing nitrate and ammonium as N sources, and after 5 weeks they were transferred for 1 week in nutrient solutions containing ammonium nitrate (AN), ammonium nitrate 1 urea (AN1U), or urea alone (U) as N sources or on a solution containing no N (starvation; S).…”

Section: Growth and N Statusmentioning

confidence: 99%

Physiological and Transcriptomic Aspects of Urea Uptake and Assimilation in Arabidopsis Plants

Mérigout

Lelandais²,

Bitton³

et al. 2008

Plant Physiology

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109

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Urea is the major nitrogen (N) form supplied as fertilizer in agriculture, but it is also an important N metabolite in plants. Urea transport and assimilation were investigated in Arabidopsis (Arabidopsis thaliana). Uptake studies using 15 N-labeled urea demonstrated the capacity of Arabidopsis to absorb urea and that the urea uptake was regulated by the initial N status of the plants. Urea uptake was stimulated by urea but was reduced by the presence of ammonium nitrate in the growth medium. N deficiency in plants did not affect urea uptake. Urea exerted a repressive effect on nitrate influx, whereas urea enhanced ammonium uptake. The use of [ N]urea and [15 N]ammonium tracers allowed us to show that urea and ammonium assimilation pathways were similar. Finally, urea uptake was less efficient than nitrate uptake, and urea grown-plants presented signs of N starvation. We also report the first analysis, to our knowledge, of Arabidopsis gene expression profiling in response to urea. Our transcriptomic approach revealed that nitrate and ammonium transporters were transcriptionally regulated by urea as well as key enzymes of the glutamine synthetase-glutamate synthase pathway. AtDUR3, a high-affinity urea transporter in Arabidopsis, was strongly up-regulated by urea. Moreover, our transcriptomic data suggest that other genes are also involved in urea influx.

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“…Controls were used for assessing the quality of the hybridizations but were not included in the statistical tests or the graphic representation of the results. Data normalization and determination of differentially expressed genes by paired t test on the log ratios using a Bonferroni P value of ,5% were as described by Merigout et al (2008).…”

Section: Statistical Analysis Of Datamentioning

confidence: 99%

The Arabidopsis Abscisic Acid Catabolic GeneCYP707A2Plays a Key Role in Nitrate Control of Seed Dormancy

et al. 2008

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Nitrate releases seed dormancy in Arabidopsis (Arabidopsis thaliana) Columbia accession seeds in part by reducing abscisic acid (ABA) levels. Nitrate led to lower levels of ABA in imbibed seeds when included in the germination medium (exogenous nitrate). Nitrate also reduced ABA levels in dry seeds when provided to the mother plant during seed development (endogenous nitrate). Transcript profiling of imbibed seeds treated with or without nitrate revealed that exogenous nitrate led to a higher expression of nitrate-responsive genes, whereas endogenous nitrate led to a profile similar to that of stratified or after-ripened seeds. Profiling experiments indicated that the expression of the ABA catabolic gene CYP707A2 was regulated by exogenous nitrate. The cyp707a2-1 mutant failed to reduce seed ABA levels in response to both endogenous and exogenous nitrate. In contrast, both endogenous and exogenous nitrate reduced ABA levels of the wild-type and cyp707a1-1 mutant seeds. The CYP707A2 mRNA levels in developing siliques were positively correlated with different nitrate doses applied to the mother plants. This was consistent with a role of the CYP707A2 gene in controlling seed ABA levels in response to endogenous nitrate. The cyp707a2-1 mutant was less sensitive to exogenous nitrate for breaking seed dormancy. Altogether, our data underline the central role of the CYP707A2 gene in the nitrate-mediated control of ABA levels during seed development and germination.

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Urea Use Efficiency of Hydroponically Grown Maize and Wheat

Cited by 35 publications

References 22 publications

Molecular and physiological interactions of urea and nitrate uptake in plants

Molecular and physiological interactions of urea and nitrate uptake in plants

Physiological and Transcriptomic Aspects of Urea Uptake and Assimilation in Arabidopsis Plants

The Arabidopsis Abscisic Acid Catabolic GeneCYP707A2Plays a Key Role in Nitrate Control of Seed Dormancy

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