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Alternative perspective on the control of transpiration by radiation

Mott, Keith A., Peak, David
Proceedings of the National Academy of Sciences of the United States of America 2011 v.108 no.49 pp. 19820-19823
General Circulation Models, blue light, internal temperature, stomatal movement, transpiration, water use efficiency
Stomatal responses to light are important determinants for plant water use efficiency and for general circulation models, but a mechanistic understanding of these responses remains elusive. A recent study [Pieruschka R, Huber G, Berry JA (2010) Proc Natl Acad Sci USA 107:13372–13377] concluded that stomata respond to total absorbed radiation rather than red and blue light as previously thought. We tested this idea by reexamining stomatal responses to red and blue light and to IR radiation. We show that responses to red and blue light are not consistent with a response to total absorbed radiation and that apparent stomatal responses to IR radiation are explainable as experimental artifacts. In addition, our data and analysis provide a method for accurately determining the internal temperature of a leaf.