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| Lens, F.; Sperry, J.S.; Christmas, M.A.; Rabaey, D.; Jansen, S.. |
| • Vulnerability to cavitation and conductive efficiency depend on xylem anatomy. We tested a large range of structure–function hypotheses, some for the first time, within a single genus to minimize phylogenetic ‘noise’ and maximize detection of functionally relevant variation. • This integrative study combined in-depth anatomical observations using light, scanning and transmission electron microscopy of seven Acer taxa, and compared these observations with empirical measures of xylem hydraulics. • Our results reveal a 2 MPa range in species’ mean cavitation pressure (MCP). MCP was strongly correlated with intervessel pit structure (membrane thickness and porosity, chamber depth), weakly correlated with pit number per vessel, and not related to pit area... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Acer; Cavitation resistance; Hydraulic conductivity; Pit structure; Rare pit hypothesis; Vessel distribution; Vessel wall thickenings; Wood density; 42.56. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/429474 |
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| Choat, B.; Jansen, S.; Brodribb, T.J.; Cochard, H.; Delzon, S.; Bhaskar, R.; Bucci, S.J.; Feild, T.S.; Gleason, S.M.; Hacke, U.G.; Jacobsen, A.L.; Lens, F.; Maherali, H.; Martínez-Vilalta, J.; Mayr, S.; Mencuccini, M.; Mitchell, P.J.; Nardini, A.; Pittermann, J.; Pratt, R.B.; Sperry, J.S.; Westoby, M.; Wright, I.J.; Zanne, A.E.. |
| Shifts in rainfall patterns and increasing temperatures associated with climate change are likely to cause widespread forest decline in regions where droughts are predicted to increase in duration and severity. One primary cause of productivity loss and plant mortality during drought is hydraulic failure. Drought stress creates trapped gas emboli in the water transport system, which reduces the ability of plants to supply water to leaves for photosynthetic gas exchange and can ultimately result in desiccation and mortality. At present we lack a clear picture of how thresholds to hydraulic failure vary across a broad range of species and environments, despite many individual experiments. Here we draw together published and unpublished data on the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Global convergence vulnerability forests drought climate change drought-induced forest decline 42.44; 43.47. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/453830 |
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