Adaptation of plants to different environmental conditions and their survival is dependent on various external
stimulus and transduction of these received signals into appropriate responses. In this context, Alvarez-Flórez et al.
(2013) noticed that in etiolated Cucumis sativus L. cotyledons, phytochrome signals may be transduced through
protein phosphorylation as has been demonstrated by the effect of red and far-red light irradiation on mitogen
activated protein kinase activity.