The Role of Starch Metabolism and Guard Cell Photosynthesis in CO2 Regulation of Stomatal Conductance

Released on by Andisheh Bagheri
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  • The Role of Starch Metabolism and Guard Cell Photosynthesis in CO2 Regulation of Stomatal Conductance Book Detail

  • Author : Andisheh Bagheri
  • Release Date : 2014
  • Publisher :
  • Genre :
  • Pages : 63
  • ISBN 13 : 9781321292008
  • File Size : 73,73 MB
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The Role of Starch Metabolism and Guard Cell Photosynthesis in CO2 Regulation of Stomatal Conductance by Andisheh Bagheri PDF Summary

Book Description: Carbon dioxide (CO2) is one of the main regulators of stomatal aperture. Few Arabidopsis mutants that are insensitive to CO2 have been previously studied and have revealed parts of the mechanisms involved in CO2 regulation of guard cell signal transduction. However, CO2 regulation of stomatal conductance still requires further investigation. Here, an innovative stomatal movement analysis in response to CO2 shifts was developed in order to study the role of starch metabolism and guard cell photosynthesis in CO2 regulation of stomatal conductance. These analyses revealed that high [CO2] induced stomatal closure was impaired in Arabidopsis mutants that cannot produce starch in general (adg1), but not in pgi1-1 Arabidopsis mutants that accumulate starch specifically in their guard cells, implying that functional starch metabolism solely in guard cells is sufficient for CO2 regulation of stomatal conductance. Additionally, kidney-shaped stomata of all three Arabidopsis GC-Chlase[Delta]N transgenic lines (#4, #5, and #8) that featured severe chlorophyll deficiency specifically in their guard cells, responded to high [CO2]-induction by stomatal closure, while their chlorophyll-less thin-shaped and collapsed stomata remained constitutively closed, suggesting that wild-type chlorophyll levels in guard cells are not required for CO2 regulation of stomatal conductance.

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