The Circadian Clock That Controls Gene Expression in Arabidopsis Is Tissue Specific

DOI PDF 被引用文献10件
  • Simon C. Thain
    Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom (S.C.T., G.M., A.J.M.);
  • Giovanni Murtas
    Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom (S.C.T., G.M., A.J.M.);
  • James R. Lynn
    Horticulture Research International, Wellesbourne, Warwick CV35 9EF, United Kingdom (J.R.L.); and
  • Robert. B. McGrath
    Laboratory of Molecular Biology, The Rockefeller University, 1230 York Avenue, New York, New York 10021 (R.B.M.)
  • Andrew J. Millar
    Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom (S.C.T., G.M., A.J.M.);

抄録

<jats:title>Abstract</jats:title><jats:p>The expression of CHALCONE SYNTHASE(CHS) expression is an important control step in the biosynthesis of flavonoids, which are major photoprotectants in plants. CHS transcription is regulated by endogenous programs and in response to environmental signals. Luciferase reporter gene fusions showed that the CHS promoter is controlled by the circadian clock both in roots and in aerial organs of transgenic Arabidopsis plants. The period of rhythmicCHS expression differs from the previously described rhythm of chlorophyll a/b-binding protein (CAB) gene expression, indicating thatCHS is controlled by a distinct circadian clock. The difference in period is maintained in the wild-type Arabidopsis accessions tested and in the de-etiolated 1 andtiming of CAB expression 1 mutants. These clock-affecting mutations alter the rhythms of both CABand CHS markers, indicating that a similar (if not identical) circadian clock mechanism controls these rhythms. The distinct tissue distribution of CAB andCHS expression suggests that the properties of the circadian clock differ among plant tissues. Several animal organs also exhibit heterogeneous circadian properties in culture but are believed to be synchronized in vivo. The fact that differing periods are manifest in intact plants supports our proposal that spatially separated copies of the plant circadian clock are at most weakly coupled, if not functionally independent. This autonomy has apparently permitted tissue-specific specialization of circadian timing.</jats:p>

収録刊行物

  • Plant Physiology

    Plant Physiology 130 (1), 102-110, 2002-09-01

    Oxford University Press (OUP)

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