Zea shoot development in response to red light interruption of the dark-growth period. I. Inhibition of first internode elongation |
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Authors: | Duke S O Wickliff J L |
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Institution: | University of Arkansas, Fayetteville, Arkansas 72701. |
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Abstract: | Brief, low energy (approximately 400 Kerg cm−2) red light interruption of the early dark-growth period of Zea mays L. cv F-M Cross induced inhibition of first internode elongation which was maximal whenever light interruption occurred from 2.5 to 4 days of seedling age. Two-thirds of the maximal inhibition occurred in the tissues constituting the region 0 to 2 mm below the coleoptilar node at time of light treatment. The coleoptile tip showed the greatest sensitivity for red light reception in the internode response. Far-red light exposures following red light treatments reversed the red light effect. However, far-red light alone inhibited first internode elongation as effectively as red light of similar dosage. |
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