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Plant-Microbe Interaction: Transcriptional Response of Bacillus Mycoides to Potato Root Exudates

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Exogenous Carbon Compounds Modulate Tomato Root Development.

Ana Isabel González-Hernández¹, Loredana Scalschi¹, Pilar García-Agustín¹

¹Grupo de Bioquímica y Biotecnología, Área de Fisiología Vegetal, Departamento de Ciencias Agrarias y del Medio Natural, ESTCE, Universitat Jaume I, 12071 Castellón, Spain.

Plants (Basel, Switzerland)

|July 9, 2020

Summary

Adding sucrose or glucose to nitrate nutrition boosts tomato root growth and nitrogen uptake. Conversely, 2-oxoglutarate hinders root development but alters gene expression related to nitrogen metabolism and antioxidants.

Keywords:

2-oxoglutarate N metabolism Solanum lycopersicum root development sugars

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Area of Science:

Plant Physiology
Plant Metabolism
Nutrient Signaling

Background:

Nitrate (NO₃^-) is crucial for plant growth, acting as both a nutrient and signaling molecule.
Nitrate influences key plant processes, including root development and overall plant health.

Purpose of the Study:

To investigate the impact of exogenous carbon (C) sources (sucrose, glucose, 2-oxoglutarate) on nitrate (NO₃^-) nutrition.
To analyze the effects on carbon/nitrogen (C/N) metabolism, auxin pathways, and antioxidant systems in tomato seedlings.

Main Methods:

10-day-old tomato seedlings were supplied with nitrate (NO₃^-) and supplemented with sucrose, glucose, or 2-oxoglutarate.
Root development parameters (primary root length, lateral root number, root density) were measured.
Gene expression analysis was performed for key genes involved in nitrogen uptake, C/N metabolism, auxin transport, and antioxidant defense.

Main Results:

Sucrose and glucose enhanced primary root length, lateral root number, and root density.
These C sources also modulated the expression of nitrate transporter (NRT2.1) and glutamine synthetase (GS1) genes.
2-oxoglutarate negatively impacted root growth but upregulated genes like NiR, GDH, PEPC1, and antioxidant gene SOD Cl.

Conclusions:

Exogenous carbon sources significantly influence tomato root architecture and nitrogen metabolism.
Sucrose and glucose promote root growth, while 2-oxoglutarate affects metabolic and antioxidant pathways.
Understanding these C/N interactions can optimize nitrogen use efficiency in crops.