Starch Hydrolysis Induced by Polarized Light in Stomatal Guard Cells of Living Plants

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Abstract
Working with uninjured leaves or strips of epidermis, closed stomata of a number of spp. were induced to open in a few hrs. upon exposure to polarized light, which induced hydrolysis of starch in guard cells. After several hrs., exposure tests indicated an accumulation of sugar in the guard cells and a decrease in starch content. Under the influence of polarized direct sunlight, hydrolysis of starch in a guard cell was sometimes accompanied or followed by a bursting as if by excessive internal pressure. There was some evidence that weak polarized light which penetrated to the mesophyll might induce starch hydrolysis therein.

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