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Light control of plastogenesis and ribulosebisphosphate carboxylase levels in mustard seedling cotyledons

✍ Scribed by S. Frosch; R. Bergfeld; H. Mohr

Book ID
104749744
Publisher
Springer-Verlag
Year
1976
Tongue
English
Weight
688 KB
Volume
133
Category
Article
ISSN
0032-0935

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✦ Synopsis

We have studied the problem whether the phytochrome-mediated accumulation of ribulosebisphosphate carboxylase (" carboxylase" ; EC 4. l. 1.39) in the cotyledons of sinapis alba L. is related to size, ultrastructure, or organization of the plastid compartment. We have shown that under different light conditions (e.g. continuous far-red light, continuous white light) which lead to conspicuously different plastids the time course of the enzyme levels remains precisely the same. It is concluded that the onset and the rate of carboxylase accumulation is not related to the organizational state of the plastid compartment as discernible under the electron microscope.

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Action of light, nitrate and ammonium on
Action of light, nitrate and ammonium on the levels of NADH- and ferredoxin-dependent glutamate synthases in the cotyledons of mustard seedlings
✍ U. Hecht; R. OelmΓΌller; S. Schmidt; H. Mohr πŸ“‚ Article πŸ“… 1988 πŸ› Springer-Verlag 🌐 English βš– 928 KB

In mustard (Sinapis alba L.) cotyledons, NADH-dependent glutamate synthase (NADH-GOGAT, EC 1.4.1.14) is only detectable during early seedling development with a peak of enzyme activity occurring between 2 and 2.5 d after sowing. With the beginning of plastidogenesis at approximately 2 d after sowing