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Title: | Hydraulically based stomatal oscillations and stomatal patchiness in Gossypium hirsutum |
Authors: | Marenco, Ricardo Antonio Siebke, Katharina Farquhar, Graham Douglas Ball, Marilyn C. |
Keywords: | Assimilation Rate Chlorophyll Fluorescence Stomatal Oscillations Vapour Pressure Difference (vpd) Carbon Dioxide Chlorophyll Concentration (process) Cotton Fluorescence Plants (botany) Carbon Dioxide Chlorophyll Cotton Heterogeneity Hydraulic Structure Light Effect Stomata Vaporization Xylem Carbon Dioxide Chlorophylls Concentrating Cotton Fluorescence Plants Gossypium Hirsutum |
Issue Date: | 2006 |
metadata.dc.publisher.journal: | Functional Plant Biology |
metadata.dc.relation.ispartof: | Volume 33, Número 12, Pags. 1103-1113 |
Abstract: | Slow stomatal oscillations (70-95 min), associated with feedback within the plant hydraulic systems, were studied in cotton (Gossypium hirsutum L.). Oscillations were only evident when the whole plant was exposed to light, and were not influenced by reductions in intercellular CO 2 concentrations (C i) in intact, attached leaves. Oscillations were synchronised among different leaves of the same plant, even when the leaf-to-air vapour pressure difference (VPD) was reduced in a cuvette enclosing one of the leaves. In the trough phase of stomatal oscillations the apparent C i was higher than expected from the combination of the observed assimilation rate and the A(C i) relationship measured in the absence of oscillations. Using chlorophyll fluorescence imaging we found evidence of stomatal heterogeneity in this phase. Finally, we found that stomatal oscillations appeared to be correlated with xylem embolism, with more vessels filled with gas at the peak than at the troughs of stomatal oscillations. © CSIRO 2006. |
metadata.dc.identifier.doi: | 10.1071/FP06115 |
Appears in Collections: | Artigos |
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