Inhibition by light of growth and Golgi-localized glucan synthetase in the maize mesocotyl |
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Authors: | Jonathan D Walton Peter M Ray |
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Institution: | (1) Department of Biological Sciences, Stanford University, 94305 Stanford, CA, USA;(2) Present address: Department of Plant Breeding and Biometry, Cornell University, 14853 Ithaca, NY, USA |
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Abstract: | When dark-grown maize (Zea mays L.) seedlings were exposed to red light (R), Golgi-localized glucan synthetase activity in the mesocotyl began to decrease within 1 h, and fell by approx. 70% in 12 h. The response required at least 10-2 mol m-2 R and saturated at 100 mol m-2. Far-red light (FR) alone inhibited glucan synthetase, and FR reversed the inhibition by R back to the level caused by FR alone. Density gradient fractionation indicated that of the major membrane markers only the Golgi-localized glucan-synthetase activity was affected by R. Golgi-localized latent inosine-diphosphatase activity was unaffected. The kinetics of the response, the photon fluence dependence, and the reversibility by FR all correlated with the inhibition by light of elongation of the mesocotyl, indicating that light inhibits growth and glucan synthetase activity by a similar mechanism.Abbreviations FR
far-red light
- GS
glucan synthetase
- IAA
indole-3-acetic acid
- R
red light |
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Keywords: | Mesocotyl Phytochrome and glucan synthetase Polysaccharide synthesis Zea (glucan synthesis) |
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