Abstract
Phytochrome-controlled appearance of ribulose-1,5-bisphosphate carboxylase (RuBP-Case) and its subunits (large subunit LSU, small subunit SSU) was studied in the cotyledons of the mustard (Sinapis alba L.) seedling. The main results were as follows: (i) Control of RuBPCase appearance by phytochrome is a modulation of a process which is turned on by an endogenous factor between 30 and 33 h after sowing (25° C). Only 12 h later the process begins to respond to phytochrome. (ii) The rise in the level of RuBP-Case is the consequence of a strictly coordinated synthesis de novo of the subunits. (iii) While the levels of translatable mRNA for SSU are compatible with the rate of SSU synthesis the relatively high LSU mRNA levels are not reflected in the rates of in-vivo LSU or RuBPCase syntheses. (iv) Gene expression is also abolished in the case of nuclear-encoded SSU if intraplastidic translation and concomitant plastidogenesis is inhibited by chloramphenicol, pointing to a “plastidic factor” as an indispensable prerequisite for expression of the SSU gene(s). (v) Regarding the control mechanism for SSU gene expression, three factors seem to be involved: an endogenous factor which turns on gene expression, phytochrome which modulates gene expression, and the plastidic factor which is an indispensable prerequisite for the appearance of translatable SSU mRNA.
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Abbreviations
- CAP:
-
chloramphenicol
- cFR:
-
continuous farred light
- LSU:
-
large subunit of RuBPCase
- NADP-GPD:
-
NADPH-dependent glyceraldehyde-3-phosphate dehydrogenase (EC 1.2.1.13)
- Pfr:
-
far-red-absorbing form of phytochrome
- pSSU:
-
precursor of SSU
- RuBPCase:
-
ribulose-1,5-bisphosphate carboxylase (EC 4.1.1.39)
- SSU:
-
small subunit of RuBPCase
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Oelmüller, R., Dietrich, G., Link, G. et al. Regulatory factors involved in gene expression (subunits of ribulose-1,5-bisphosphate carboxylase) in mustard (Sinapis alba L.) cotyledons. Planta 169, 260–266 (1986). https://doi.org/10.1007/BF00392323
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DOI: https://doi.org/10.1007/BF00392323