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Stomatal guard cell fluorescence - an indicator of guard cell C economy during changes in stomatal aperture in response to altered atmospheric water content

Project Member(s): Ralph, P.

Start year: 2001

Summary: Stomata are pores in leaves through which water is transpired and CO2 diffuses for photosynthesis. Stomata open and close in response to changes in atmospheric water content to regulate transpiration. Such movements of stomates require metabolic energy in the form of adenosine triphosphate, which is made in stomatal choloroplasts during stomatal photosynthesis. Changes in photosynthetic capacity can be measured in situ & non-destructively using chlorophyll fluorescence. We will investigate changes in fluorescence during stomatal opening and closing induced by changes in atmospheric water content. Understanding the regulation of stomata is vital to managing forested catchments for water use since stomata regulate forest water use. This is the first time such work has been undertaken.

FOR Codes: Plant Physiology, Terrestrial Ecology, Land and water management