Abstract
Maize (Zea mays L.) seedlings were grown in the presence or absence of an herbicide, norflurazon (4-chloro-5-(methylamino)-2-(α,α,α-trifluoro-m-tolyl)-pyridazinone), which prevents the accumulation of colored carotenoids. In the absence of carotenoids, plants grown in high light incur extensive photooxidative damage to their plastids, but relatively little damage elsewhere. Growth in very low light minimizes chlorophyll photooxidation and allows chloroplast development to proceed. We have previously reported that mRNA encoding light-harvesting chlorophyll a/b protein (LHCP) fails to accumulate in high-light-grown carotenoid-deficient seedlings, but accumulates normally in carotenoid-deficient seedlings grown in low light. Here we extend these results by examining the levels of translatable mRNAs encoding seven additional nuclear-encoded chloroplast proteins. When norflurazon-treated seedlings were grown in low light for 8 d and then transferred to high light for 24 h, three cytosolic mRNAs (plastocyanin, Rieske Fe−S protein, and the 33-kdalton (kDa) subunit of the photosystem II O2-evolving complex) decreased to less than 1% the amount found in untreated seedlings. Two other mRNAs (NADP malic enzyme, EC 1.1.1.40, and the 23-kDa subunit of the photosystem II O2-evolving complex) decreased significantly but not to levels as low as the first three. Levels of translatable mRNA for two other chloroplast proteins (pyruvate orthophosphate dikinase, EC 2.7.9.1, and ferredoxin NADP oxidoreductase, EC 1.18.1.2) were not reduced in nonflurazon-treated seedlings after 24 h in high light, but did not show the normal light-induced increase found in untreated plants. Photooxidative damage in the chloroplast thus affects the accumulation of a number of cytosolic mRNAs encoding proteins destined for the chloroplast.
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Abbreviations
- Da:
-
dalton
- FNR:
-
ferredoxin NADP oxidoreductase
- LHCP:
-
light-harvesting chlorophyll a/b-binding protein
- poly(A)RNA:
-
polyadenylated RNA
- PPDK:
-
pyruvate orthophosphate dikinase
- PSII:
-
photosystem II
- SDSPAGE:
-
sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- SSu:
-
small subunit (of ribulose-1,5-bisphosphate carboxylase)
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Burgess, D.G., Taylor, W.C. Chloroplast photooxidation affects the accumulation of cytosolic mRNAs encoding chloroplast proteins in maize. Planta 170, 520–527 (1987). https://doi.org/10.1007/BF00402986
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DOI: https://doi.org/10.1007/BF00402986