Effect of UV Light on Lettuce Seed Germination and on the Unfolding of Grass Leaves

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Abstract
The effect of UV light on germination of lettuce seeds and on the unfolding of wheat leaves was studied.A small improvement in germination was noted on exposure lo light of 254, 265, 334, 405 nm, and in unfolding on exposure to light of 254, 265, 313, 334, 360 and 405 nm.The low germination rate at 238 nm shows, that light energy absorbed by the high‐absorbing protein part of the phylochrome (Siegelman and Butler 1965) cannot be used in the germination process.