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. 1989 Nov;91(3):930–938. doi: 10.1104/pp.91.3.930

Effects of Cold-Treatment on Protein Synthesis and mRNA Levels in Rice Leaves 1

Matthias Hahn 1,2, Virginia Walbot 1
PMCID: PMC1062098  PMID: 16667159

Abstract

The effects of cold on protein and RNA metabolism in leaves of rice (Oryza sativa L.) seedlings were investigated. Treatment with a diurnal cycle of 15/10°C or 11/6°C for up to 1 week resulted in progressive changes in the protein synthesis pattern after in vivo labeling of intact rice leaves with [35S]methionine. These changes were reversed when the seedlings were returned to normal growth temperatures. While de novo accumulation of several abundant proteins was suppressed, some polypeptides were consistently found to be cold-induced. Synthesis of ribulose 1,5-bisphosphate carboxylase (Rubisco) was drastically reduced after 7 days of cold. Using immunoprecipitation of Rubisco, evidence was obtained that the suppression was greater for the small subunit (over 90%) than for the large subunit (80%), indicating a partial loss of coordination in their synthesis. Preformed Rubisco as well as other cold-suppressed proteins were stable for up to 7 days at 11/6°C. Cold-sensitive rice cultivars responded with similar but more drastic changes in the protein synthesis pattern when compared to cold-tolerant varieties. The suppression of Rubisco synthesis by cold was shown to result from reduced levels of the mRNAs encoding both subunits; their decrease paralleled the lower protein synthesis of each. The levels of other chloroplast-encoded mRNAs, especially psaB, and of the nuclear encoded chlorophyll a/b binding protein, also strongly decreased in the cold, whereas the transcripts of the mitochondrial genes apt9, coxIII, and most nuclear genes analyzed were unaffected or only slightly reduced. These data indicate that some chloroplast functions are disturbed during cold stress. One nuclear gene known to be induced by water stress and ABA (Rab21) was also found to be induced by cold treatment.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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