Transcriptional Down-Regulation by Abscisic Acid of Pathogenesis-Related β-1,3-Glucanase Genes in Tobacco Cell Cultures1

DOI PDF 被引用文献5件
  • Enea Rezzonico
    Friedrich Miescher Institute, P.O. Box 2543, CH-4002 Basel, Switzerland (R.B., E.R., N.F., F.M.)
  • Nathalie Flury
    Friedrich Miescher Institute, P.O. Box 2543, CH-4002 Basel, Switzerland (R.B., E.R., N.F., F.M.)
  • Frederick Meins
    Friedrich Miescher Institute, P.O. Box 2543, CH-4002 Basel, Switzerland (R.B., E.R., N.F., F.M.)
  • Roland Beffa
    Friedrich Miescher Institute, P.O. Box 2543, CH-4002 Basel, Switzerland (R.B., E.R., N.F., F.M.)

抄録

<jats:title>Abstract</jats:title> <jats:p>Class I isoforms of β-1,3-glucanases (βGLU I) and chitinases (CHN I) are antifungal, vacuolar proteins implicated in plant defense. Tobacco (Nicotiana tabacum L.) βGLU I and CHN I usually exhibit tightly coordinated developmental, hormonal, and pathogenesis-related regulation. Both enzymes are induced in cultured cells and tissues of cultivar Havana 425 tobacco by ethylene and are down-regulated by combinations of the growth hormones auxin and cytokinin. We report a novel pattern of βGLU I and CHN I regulation in cultivar Havana 425 tobacco pith-cell suspensions and cultured leaf explants. Abscisic acid (ABA) at a concentration of 10 μmmarkedly inhibited the induction of βGLU I but not of CHN I. RNA-blot hybridization and immunoblot analysis showed that only class I isoforms of βGLU and CHN are induced in cell culture and that ABA inhibits steady-state βGLU I mRNA accumulation. Comparable inhibition of β-glucuronidase expression by ABA was observed for cells transformed with a tobacco βGLU I gene promoter/β-glucuronidase reporter gene fusion. Taken together, the results strongly suggest that ABA down-regulates transcription of βGLU I genes. This raises the possibility that some of the ABA effects on plant-defense responses might involve βGLU I.</jats:p>

収録刊行物

  • Plant Physiology

    Plant Physiology 117 (2), 585-592, 1998-06-01

    Oxford University Press (OUP)

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