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Recent biochemical and genetic studies confirm that hydrogen peroxide is a signalling
molecule in plants that mediates responses to abiotic and biotic stresses. Signalling
roles for hydrogen peroxide during abscisic-acid-mediated stomatal closure, auxin-regulated
root gravitropism and tolerance of oxygen deprivation are now evident. The synthesis
and action of hydrogen peroxide appear to be linked to those of nitric oxide. Downstream
signalling events that are modulated by hydrogen peroxide include calcium mobilisation,
protein phosphorylation and gene expression. Calcium and Rop signalling contribute
to the maintenance of hydrogen peroxide homeostasis.