ISSN:
1432-2048
Keywords:
Mesocotyl
;
Phytochrome and glucan synthetase
;
Polysaccharide synthesis
;
Zea (glucan synthesis)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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 μmol m-2 R and saturated at 100 μmol 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00397467
Permalink