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02:27Trihybrid Crosses
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Trihybrid Crosses
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Phenotyping two tomato genotypes with different nitrogen use efficiency.
Maria Rosa Abenavoli1, Caterina Longo1, Antonio Lupini1
1Dipartimento AGRARIA, Università Mediterranea di Reggio Calabria, Salita Melissari, I-89124, Reggio Calabria, Italy.
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Summary
Optimizing nitrogen use efficiency (NUE) in tomatoes is key for crop production. Researchers found that nitrogen utilization (NUtE) plays a larger role than nitrogen uptake (NUpE) in determining overall NUE between tomato genotypes.
Keywords:
Nitrate influxNitrate reductaseNitrate transporter genesNitrate uptakeNitrogen Uptake Efficiency – NUpENitrogen Utilization Efficiency – NUtETomato (Solanum lycopersicon L.)More Related Videos
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Area of Science:
- Plant Physiology
- Agricultural Science
- Genetics
Background:
- Nitrogen (N) supply is a primary limiting factor in crop production.
- Optimizing nitrogen use efficiency (NUE) is crucial for minimizing fertilizer loss and environmental impact.
- NUE can be dissected into crop N uptake (NUpE) and N utilization (NUtE).
Purpose of the Study:
- To compare NUE in different tomato genotypes.
- To identify the underlying physiological traits contributing to contrasting NUE between high-NUE (Regina Ostuni - RO) and low-NUE (UC82) tomato genotypes.
- To investigate the roles of NUpE and NUtE in determining overall NUE.
Main Methods:
- Cultured 14 tomato genotypes in sand or hydroponic systems with nitrate (NO3(-)) supply.
- Compared NUE, root nitrate influx, transporter gene expression (SlNRT2.1/NAR2.1, SlNRT2.3), root morphology, nitrate reductase activity, and root cell electrical potentials.
- Evaluated genotypes under varying nitrate concentrations (0.1 and 5 mM) and after N-starvation.
Main Results:
- Regina Ostuni (RO) and UC82 were consistently identified as high and low NUE genotypes, respectively.
- UC82 exhibited greater root nitrate influx and SlNRT2.1/NAR2.1 expression under low nitrate supply compared to RO.
- RO displayed higher total root length/thickness, greater shoot SlNRT2.3 expression, and higher nitrate storage under high nitrate supply compared to UC82.
Conclusions:
- Nitrogen utilization efficiency (NUtE) appears to play a more significant role than nitrogen uptake efficiency (NUpE) in differentiating NUE between the studied tomato genotypes (RO and UC82).
- Differences in root morphology and nitrate storage contribute to the observed NUE variations.
- Understanding the genetic and physiological basis of NUtE can lead to improved crop breeding strategies for enhanced NUE.