Sucrose Protects Arabidopsis Roots from Chromium Toxicity Influencing the Auxin–Plethora Signaling Pathway and Improving Meristematic Cell Activity

Plants adapt to challenging growth conditions, such as the scarcity of nutrients or exposure to toxic metals, via changes in root system architecture. Chromium (Cr) is a non-essential element that when supplied in sublethal concentrations inhibits primary root growth through decreasing meristematic...

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Bibliographic Details
Published in:Journal of plant growth regulation 2018-06, Vol.37 (2), p.530-538
Main Authors: Hernández-Madrigal, Fátima, Ortiz-Castro, Randy, Ruiz-Herrera, León Francisco, Cervantes, Carlos, López-Bucio, José, Martínez-Trujillo, Miguel
Format: Article
Language:English
Subjects:
Agriculture
Arabidopsis
Biomedical and Life Sciences
Cell division
Chromium
Growth conditions
Heavy metals
Life Sciences
Nutrients
Photosynthesis
Plant Anatomy/Development
Plant growth
Plant Physiology
Plant protection
Plant Sciences
Seedlings
Signal transduction
Signaling
Stem cells
Sucrose
Sugar
Supplements
Toxicity
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Summary:Plants adapt to challenging growth conditions, such as the scarcity of nutrients or exposure to toxic metals, via changes in root system architecture. Chromium (Cr) is a non-essential element that when supplied in sublethal concentrations inhibits primary root growth through decreasing meristematic activity and affects photosynthesis. Here, we show that sucrose reverses the inhibitory effects of Cr(VI) on plant growth and development. Sucrose supplementation reactivated primary root growth under repressing Cr(VI) concentrations by restoring cell division and auxin distribution at the root meristem, keeping stem cell niche functioning. Analysis of the growth of Arabidopsis wild-type and mutant seedlings defective in auxin transport or signaling further revealed a critical role of auxin in mediating the effects of sucrose to protect plants from Cr(VI) toxicity. The results suggest that sucrose acts as a regulator in the maintenance of root meristem activity to overcome the stress generated by sublethal Cr(VI) concentrations.
ISSN:0721-7595
1435-8107
DOI:10.1007/s00344-017-9751-1