A Study of the Growth and Photoperceptivity of Etiolated Oat Seedlings

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Abstract
The photoperceptivity of intact oat seedlings has been observed after pretreating them for 3 days in darkness with a number of substances—copper and manganese ions, EDTA, copper-glycine, glycine, nitrates, indoleacetic acid, ethanol, and carbon dioxide. None enhanced photosensitivity; carbon dioxide and ethanol reduced it. Copper-glycine in darkness promoted mesocoty1 growth and induced root formation. The effects of carbon dioxide and ethanol are shown to be identical and to account for this a speculative proposal is made about maturation. An alternative explanation of the growth of the mesocotyl then arises. The relationship between maturation and the behaviour of the seedling upon illumination is discussed.