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Título : Low temperature regulates Arabidopsis Lhcb gene expression in a light-independent manner
Autor : Capel Salinas, Juan, Jarillo, José A., Madueño Albi, Francisco, Jorquera, María J., Martínez-Zapater, José M., Salinas, Julio
Fecha de publicación : 1998
Editor: John Wiley & Sons
Resumen: Low temperature treatment of dark-grown seedlings of Arabidopsis thaliana results in a rapid increase in the amount of mRNAs encoding for the major polypeptides of the light-harvesting complex of photosystem II (Lhcb1 genes). This increase is transient and seems to be due mainly to the accumulation of Lhcb1*3 transcripts, indicating that low temperature differentially regulates the expression of the Arabidopsis Lhcb1 gene family in the dark. A 1.34 kb fragment of the Lhcb1*3 promoter is sufficient to confer low temperature regulation to a reporter gene in transgenic Arabidopsis etiolated seedlings, suggesting that the regulation is occurring at the transcriptional level. The cold-induced accumulation of Lhcb1*3 mRNA is not part of a general response to stressful conditions since no accumulation is detected in response to water stress, anaerobiosis or salt stress. The amount of Lhcb1*3 mRNA decrease in response to exogenous abscisic acid (ABA) suggesting that this phytohormone acts as a negative regulator. Moreover, the accumulation of Lhcb1*3 mRNAs in cold-treated ABA deficient etiolated seedlings is higher than that of wild-type and ABA insensitive etiolated seedlings, indicating that low temperature regulation of Lhcb1*3 is not mediated by ABA.
Descripción : PMID: 9680990
Versión del editor:
ISSN: 0960-7412
DOI: 10.1046/j.1365-313X.1998.00039.x
Citación : The Plant Journal 13(3): 411–418, (1998)
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