Abstract
Primary leaves of dark‐grown barley (Hordeum vulgare L. cv. Weibull's Ida) unroll in darkness when cut into sections shorter than about 2 cm; the shorter the more unrolling. The unrolling pattern of irradiated leaf sections longer than about 2 cm indicates a polarity in the leaves: the top end of the basal section of a divided leaf unrolls more than the base end of the distal section. Earlier reported findings of a stimulus transmission from irradiated to non‐irradiated areas can be fully explained by light‐piping and by mechanical, mutual influence between irradiated and non‐irradiated areas.
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