Abstract
AbstractRecent literature on light‐induced changes in the distribution of growth and of endogenous growth regulators in the development of phototropic curvature is reviewed. It is concluded that in a great many cases the Cholodny‐Went hypothesis is sufficient to account for the growth changes bringing about curvature, though in certain dicotyledonous seedlings differential effects of light on the synthesis of growth inhibitors across the tissue from the lighted to the shaded side are implicated. The problems in the interpretation of results from experiments in which more than one photoresponse may be simultaneously induced are discussed and methods of circumventing them considered. Action spectroscopy suggests that dicotyledonous seedlings may have the same phototropic photoreceptor as monocotyledonous seedlings.
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