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Plant nutrient uptake and metabolism
Research Guide
What is Plant nutrient uptake and metabolism?
Plant nutrient uptake and metabolism is the set of physiological, molecular, and genetic processes by which plants acquire essential nutrients such as nitrogen and phosphorus from the soil through roots and integrate them into metabolic pathways that support growth and development.
This field examines mechanisms of nutrient uptake, including nitrogen and phosphorus, with focus on root architecture, sugar signaling, nutrient sensing, and genetic regulation. Over 84,538 works address these processes and their effects on plant development and metabolism. Key studies highlight transporters, nitrate metabolism, and interactions with environmental stresses like salinity.
Topic Hierarchy
Research Sub-Topics
Nitrate Transporters in Plants
This sub-topic covers NRT and NPF gene families mediating high- and low-affinity nitrate uptake across root plasma membranes. Researchers characterize transport kinetics, regulation by external nitrate, and genetic diversity across species.
Phosphorus Acquisition Root Architecture
This sub-topic examines root system modifications like cluster roots and mycorrhizal symbioses enhancing soil phosphorus mobilization. Researchers study PHR transcription factors and strigolactone signaling in low-P responses.
Sugar Signaling in Nutrient Homeostasis
This sub-topic investigates hexokinase-dependent and trehalose-6-phosphate pathways linking carbon status to nutrient uptake gene expression. Researchers analyze cross-talk between sugar and nitrate/phosphate signaling networks.
Nutrient Sensing Mechanisms in Roots
This sub-topic focuses on root tip sensors detecting localized nutrient patches and triggering foraging responses. Researchers identify CBL-CIPK networks and TOR kinase in nitrate and phosphate sensing.
Genetic Regulation of Nitrogen Metabolism
This sub-topic studies NLP and Dof transcription factors regulating nitrate assimilation genes like NiR and Fd-GOGAT. Researchers use GWAS and CRISPR to dissect QTLs controlling NUE traits.
Why It Matters
Plant nutrient uptake and metabolism directly influences crop yield and stress tolerance in agriculture. For example, Bates et al. (1973) developed a method for rapid determination of free proline, a key osmolyte accumulated under water stress that links nutrient metabolism to drought tolerance, enabling practical assessments in breeding programs. Munns and Tester (2008) detailed salinity tolerance mechanisms, separating osmotic and ionic phases that affect nutrient uptake, with applications in improving growth of crops like wheat under saline soils affecting 20% of irrigated land. These insights support genetic regulation strategies in soybean, as shown in the genome sequence by Schmutz et al. (2010), aiding development of nutrient-efficient varieties for sustainable farming.
Reading Guide
Where to Start
"Rapid determination of free proline for water-stress studies" by Bates et al. (1973), as it provides a foundational, practical method linking proline metabolism to nutrient stress responses, accessible for understanding basic measurements.
Key Papers Explained
Bates et al. (1973) establish proline measurement for stress studies, which Munns and Tester (2008) build upon by detailing salinity phases affecting nutrient uptake, including proline's role. Zhu (2002) extends this to signaling transduction, connecting ionic homeostasis to nutrient sensing, while Hasegawa et al. (2000) detail cellular responses integrating these pathways. Farquhar et al. (1989) link carbon metabolism to isotopic insights on nutrient influences.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research continues on genetic regulation of transporters in root architecture for nitrogen and phosphorus, as implied in the 84,538 works. Soybean genome insights from Schmutz et al. (2010) support breeding for efficient uptake. Modeling via Jones et al. (2002) DSSAT integrates metabolism with crop management under stress.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Fast and accurate short read alignment with Burrows–Wheeler tr... | 2009 | Bioinformatics | 60.4K | ✓ |
| 2 | Rapid determination of free proline for water-stress studies | 1973 | Plant and Soil | 19.9K | ✕ |
| 3 | Mechanisms of Salinity Tolerance | 2008 | Annual Review of Plant... | 12.9K | ✕ |
| 4 | Nutrient requirements of suspension cultures of soybean root c... | 1968 | Experimental Cell Rese... | 9.4K | ✕ |
| 5 | Carbon Isotope Discrimination and Photosynthesis | 1989 | Annual Review of Plant... | 6.7K | ✕ |
| 6 | S<scp>ALT AND</scp> D<scp>ROUGHT</scp> S<scp>TRESS</scp> S<scp... | 2002 | Annual Review of Plant... | 5.8K | ✓ |
| 7 | P<scp>LANT</scp>C<scp>ELLULAR AND</scp>M<scp>OLECULAR</scp>R<s... | 2000 | Annual Review of Plant... | 4.5K | ✕ |
| 8 | Genome sequence of the palaeopolyploid soybean | 2010 | Nature | 4.5K | ✓ |
| 9 | The DSSAT cropping system model | 2002 | European Journal of Ag... | 4.1K | ✕ |
| 10 | Plant drought stress: effects, mechanisms and management | 2008 | Agronomy for Sustainab... | 3.9K | ✕ |
Frequently Asked Questions
What role does proline play in plant nutrient metabolism under stress?
Proline accumulates as an osmoprotectant during water stress, aiding osmotic adjustment and stabilizing proteins. Bates et al. (1973) introduced a rapid acid-ninhydrin method to measure free proline, which takes less than 10 minutes and detects as little as 0.2 μg. This technique reveals proline's link to nutrient metabolism in stress responses.
How do plants respond to salinity in nutrient uptake?
Salinity inhibits growth in two phases: a rapid osmotic phase slowing young leaf expansion and a slower ionic phase causing toxicity. Munns and Tester (2008) describe these at cellular, organ, and whole-plant levels, involving ion homeostasis. Nutrient transporters adjust to maintain uptake under high salt.
What are the nutrient requirements for soybean root cell cultures?
Soybean root cell suspension cultures require specific macronutrients and micronutrients for growth. Gamborg et al. (1968) defined optimal levels, including nitrogen sources like nitrate, supporting rapid proliferation. These media formulations remain standards for plant cell studies.
How does carbon isotope discrimination relate to nutrient metabolism?
Carbon isotope discrimination during photosynthesis reflects enzymatic processes like Rubisco activity, influenced by nutrient availability. Farquhar et al. (1989) explain its physical and biochemical bases, linking it to photosynthetic metabolism. It serves as a tool to assess environmental impacts on nutrient use.
What signaling pathways regulate nutrient uptake under salt stress?
Salt stress triggers ionic homeostasis via the SOS pathway and osmotic signaling involving ABA. Zhu (2002) outlines these transduction networks, including calcium sensors and gene regulation. They integrate nutrient sensing with growth control.
How does high salinity affect plant cellular nutrient responses?
High salinity induces signal transduction altering gene expression for ion transport and osmolyte synthesis. Hasegawa et al. (2000) review molecular responses compared to model organisms, emphasizing downstream metabolic adjustments. This maintains nutrient balance under stress.
Open Research Questions
- ? How do root architecture adaptations optimize phosphorus uptake under low-soil availability?
- ? What genetic regulators integrate sugar signaling with nitrogen transporter expression?
- ? How do nutrient sensing mechanisms interact with salinity-induced ionic stress pathways?
- ? What role do palaeopolyploid genomes play in evolving nutrient metabolism efficiency?
- ? How can models like DSSAT predict nutrient uptake under combined drought and salinity?
Recent Trends
The field encompasses 84,538 works on nutrient uptake mechanisms, with sustained focus on root architecture and transporters amid stress.
Highly cited papers like Munns and Tester (12,903 citations) and Bates et al. (1973) (19,889 citations) underscore ongoing relevance of salinity and proline in metabolism studies.
2008No recent preprints or news indicate steady integration into broader plant science.
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