Journal
PLANT SIGNALING & BEHAVIOR
Volume 6, Issue 11, Pages 1855-1857Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.6.11.17014
Keywords
ATP; ADP; abscisic acid; calcium; channel; glutamate; root
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Funding
- Leverhulme Trust
- Alexander James Keith Fund
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Extracellular purine nucleotides appear capable of regulating plant development, defense and stress responses by acting in part as agonists of plasma membrane calcium channels. Factors stimulating ATP release include wounding, osmotic stress and elicitors. Here we show that exogenous abscisic acid and l-glutamate can also cause ATP accumulation around Arabidopsis thaliana roots. Release of ADP from root epidermis would trigger ionotropic receptor-like activity in the plasma membrane, resulting in transient elevation of cytosolic free calcium. Root epidermal protoplasts (expressing aequorin as a cytosolic free calcium reporter) can support an extracellular ADP-induced cytosolic calcium elevation in the presence of an extracellular reductant. This confirms that ADP could elicit calcium-based responses distinct to those of ATP, which have been shown previously to involve production of extracellular reactive oxygen species.
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