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Effects of light quality upon the growth of avena sativa coleoptiles

Effects of light quality upon the growth of avena sativa coleoptiles

Zeitschrift fuer Pflanzenphysiologie 91(1): 1-6

Growth of decapitated A. sativa coleoptile segments, of coleoptile segments which included the tip, and of coleoptiles of intact seedlings was compared in darkness and in light of different wavelengths. In all instances, both in light and in darkness, coleoptile growth in intact seedlings exceeded that of decapitated coleoptile segments, while the growth of decapitated segments was greater than that of segments which included the tip. The expansion of decapitated coleoptile segments is insensitive to light, the resulting growth being comparable to that in darkness. The growth of apical coleoptile segments is inhibited, in comparison with control segments incubated in darkness, at 510-565 nm, but stimulated at 605-700 nm. Growth of the coleoptiles of intact Avena seedlings is inhibited at 455-565 nm and at 660-700 nm, although not at intermediate wavelengths.

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