Influence of Spectral Quality of Light on Pollen Tube Elongation in Arachis hypogaea

The effect of light of different wave lengths (red RL, blueBL, yellow YL, green GL and far-red FR) on pollen tube elongationhas been studied in Arachis hypogaea. Short exposure of pollento RL caused enhanced tube elongation and this effect was reducedby FR and BL. The effects of RL and FR were mutually reversible.Similarly, the inhibitory effect of blue light could be overcomeby IAA and riboflavin separately whereas acetylcholine and GA₃mimicked the RL effect. The activities of peroxidase (PO) andmalate dehydrogenase (MDH) were increased by RL and IAA whereasBL increased the activity of IAA-oxidase. The regulatory roleof light of different spectral composition in controlling pollentube elongation is discussed. Arachis hypogaea, pollen tube elongation, light