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      SALT ANDDROUGHTSTRESSSIGNALTRANSDUCTION INPLANTS

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      Annual Review of Plant Biology
      Annual Reviews

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          Abstract

          Salt and drought stress signal transduction consists of ionic and osmotic homeostasis signaling pathways, detoxification (i.e., damage control and repair) response pathways, and pathways for growth regulation. The ionic aspect of salt stress is signaled via the SOS pathway where a calcium-responsive SOS3-SOS2 protein kinase complex controls the expression and activity of ion transporters such as SOS1. Osmotic stress activates several protein kinases including mitogen-activated kinases, which may mediate osmotic homeostasis and/or detoxification responses. A number of phospholipid systems are activated by osmotic stress, generating a diverse array of messenger molecules, some of which may function upstream of the osmotic stress-activated protein kinases. Abscisic acid biosynthesis is regulated by osmotic stress at multiple steps. Both ABA-dependent and -independent osmotic stress signaling first modify constitutively expressed transcription factors, leading to the expression of early response transcriptional activators, which then activate downstream stress tolerance effector genes.

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          Author and article information

          Journal
          Annual Review of Plant Biology
          Annu. Rev. Plant Biol.
          Annual Reviews
          1543-5008
          1545-2123
          June 2002
          June 2002
          : 53
          : 1
          : 247-273
          Affiliations
          [1 ]Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721; e-mail:
          Article
          10.1146/annurev.arplant.53.091401.143329
          3128348
          12221975
          4ed611a7-e356-4927-87d4-7c419a5c50db
          © 2002
          History

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