The Causes of Leaf Hydraulic Vulnerability and Its Influence on Gas Exchange in Arabidopsis thaliana
| Autor: | Hervé Cochard, Leila R. Fletcher, Christine Scoffoni, Megan K. Bartlett, Thomas N. Buckley, Steven Jansen, Marissa A. Caringella, Andrew J. McElrone, Caetano Pereira Pedroso de Albuquerque, Craig R. Brodersen, Lawren Sack |
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| Přispěvatelé: | University of California [Los Angeles] (UCLA), University of California, University of California [Davis] (UC Davis), Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant - Clermont Auvergne (PIAF), Institut National de la Recherche Agronomique (INRA)-Université Clermont Auvergne (UCA), Princeton University, Yale University [New Haven], Universität Ulm - Ulm University [Ulm, Allemagne], Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant (PIAF), Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de la Recherche Agronomique (INRA), University of California (UC), Institut National de la Recherche Agronomique (INRA)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020]) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Physiology Turgor pressure vulnerability Arabidopsis mesophyll conductance Plant Science xylem 01 natural sciences photoradiation Models Arabidopsis thaliana Photosynthesis response Vegetal Biology biology Dehydration Chemistry xylème food and beverages abscisic-acid Biological Sciences Circadian Rhythm Droughts prunus-laurocerasus Agricultural And Veterinary Sciences light Stomatal conductance water transport Membrane permeability Plant Biology & Botany water bundle-sheath 03 medical and health sciences Xylem eau Botany Genetics medicine stomatal aperture size [SDV.BV]Life Sciences [q-bio]/Vegetal Biology vulnérabilité lumière Plant Sciences fungi X-Ray Microtomography 15. Life on land Carbon Dioxide medicine.disease biology.organism_classification Biological pip aquaporins drought-induced embolism Plant Leaves 030104 developmental biology Biologie végétale 010606 plant biology & botany |
| Zdroj: | Plant Physiology 4 (178), 1584-1601. (2018) Plant Physiology Plant Physiology, American Society of Plant Biologists, 2018, 178 (4), pp.1584-1601. ⟨10.1104/pp.18.00743⟩ Scoffoni, Christine; Albuquerque, Caetano; Cochard, Herve; Buckley, Thomas N; Fletcher, Leila R; Caringella, Marissa A; et al.(2018). The Causes of Leaf Hydraulic Vulnerability and Its Influence on Gas Exchange in Arabidopsis thaliana. PLANT PHYSIOLOGY, 178(4), 1584-1601. doi: 10.1104/pp.18.00743. UC Davis: Retrieved from: http://www.escholarship.org/uc/item/31b978dp Plant physiology, vol 178, iss 4 Plant Physiology, 2018, 178 (4), pp.1584-1601. ⟨10.1104/pp.18.00743⟩ |
| ISSN: | 0032-0889 1532-2548 |
| DOI: | 10.1104/pp.18.00743⟩ |
| Popis: | The influence of the dynamics of leaf hydraulic conductance (K-leaf) diurnally and during dehydration on stomatal conductance and photosynthesis remains unclear. Using the model species Arabidopsis (Arabidopsis thaliana ecotype Columbia-0), we applied a multitiered approach including physiological measurements, high-resolution x-ray microcomputed tomography, and modeling at a range of scales to characterize (1) K-leaf decline during dehydration; (2) its basis in the hydraulic conductances of leaf xylem and outside-xylem pathways (K-ox); (3) the dependence of its dynamics on irradiance; (4) its impact on diurnal patterns of stomatal conductance and photosynthetic rate; and (5) its influence on gas exchange and survival under simulated drought regimes. Arabidopsis leaves showed strong vulnerability to dehydration diurnally in both gas exchange and hydraulic conductance, despite lack of xylem embolism or conduit collapse above the turgor loss point, indicating a pronounced sensitivity of K-ox to dehydration. K(leaf )increased under higher irradiance in well-hydrated leaves across the full range of water potential, but no shift in K-leaf vulnerability was observed. Modeling indicated that responses to dehydration and irradiance are likely attributable to changes in membrane permeability and that a dynamic K-ox would contribute strongly to stomatal closure, improving performance, survival, and efficient water use during drought. These findings for Columbia-0 provide a baseline for assessing variation across genotypes in hydraulic traits and their influence on gas exchange during dehydration. |
| Databáze: | OpenAIRE |
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