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      The role of gibberellin signalling in plant responses to abiotic stress.

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          Abstract

          Plant hormones are small molecules that regulate plant growth and development, as well as responses to changing environmental conditions. By modifying the production, distribution or signal transduction of these hormones, plants are able to regulate and coordinate both growth and/or stress tolerance to promote survival or escape from environmental stress. A central role for the gibberellin (GA) class of growth hormones in the response to abiotic stress is becoming increasingly evident. Reduction of GA levels and signalling has been shown to contribute to plant growth restriction on exposure to several stresses, including cold, salt and osmotic stress. Conversely, increased GA biosynthesis and signalling promote growth in plant escape responses to shading and submergence. In several cases, GA signalling has also been linked to stress tolerance. The transcriptional regulation of GA metabolism appears to be a major point of regulation of the GA pathway, while emerging evidence for interaction of the GA-signalling molecule DELLA with components of the signalling pathway for the stress hormone jasmonic acid suggests additional mechanisms by which GA signalling may integrate multiple hormone signalling pathways in the response to stress. Here, we review the evidence for the role of GA in these processes, and the regulation of the GA signalling pathway on exposure to abiotic stress. The potential mechanisms by which GA signalling modulates stress tolerance are also discussed.

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          Author and article information

          Journal
          J Exp Biol
          The Journal of experimental biology
          The Company of Biologists
          1477-9145
          0022-0949
          Jan 01 2014
          : 217
          : Pt 1
          Affiliations
          [1 ] Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK.
          Article
          217/1/67
          10.1242/jeb.089938
          24353205
          25827b0b-cfbc-47cf-a53b-701b2d0f4b3a
          History

          Abiotic stress,DELLA,Gibberellin,Growth,Stress tolerance
          Abiotic stress, DELLA, Gibberellin, Growth, Stress tolerance

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