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• W2098097608 abstract "The core of plant physiology is a set of functional solutions to a tradeoff between CO(2) acquisition and water loss. To provide an important evolutionary perspective on how the earliest land plants met this tradeoff, we constructed a mathematical model (constrained geometrically with measurements of fossils) of the hydraulic resistance of Asteroxylon, an Early Devonian plant. The model results illuminate the water transport physiology of one of the earliest vascular plants. Results show that Asteroxylon's vascular system contains cells with low hydraulic resistances; these resistances are low because cells were covered by scalariform pits, elliptical structures that permit individual cells to have large areas for water to pass from one cell to another. Asteroxylon could move a large amount of water quickly given its large pit areas; however, this would have left these plants particularly vulnerable to damage from excessive evapotranspiration. These results highlight a repeated pattern in plant evolution, wherein the evolution of highly conductive vascular tissue precedes the appearance of adaptations to increase water transport safety. Quantitative insight into the vascular transport of Asteroxylon also allows us to reflect on the quality of CO(2) proxy estimates based on early land plant fossils. Because Asteroxylon's vascular tissue lacked any safety features to prevent permanent damage, it probably used stomatal abundance and behavior to prevent desiccation. If correct, low stomatal frequencies in Asteroxylon reflect the need to limit evapotranspiration, rather than adaptation to high CO(2) concentrations in the atmosphere. More broadly, methods to reveal and understand water transport in extinct plants have a clear use in testing and bolstering fossil plant-based paleoclimate proxies." @default.
• W2098097608 created "2016-06-24" @default.
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• W2098097608 date "2011-01-19" @default.
• W2098097608 modified "2023-10-01" @default.
• W2098097608 title "Hydraulics of <i>Asteroxylon mackei</i>, an early Devonian vascular plant, and the early evolution of water transport tissue in terrestrial plants" @default.
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• W2098097608 doi "https://doi.org/10.1111/j.1472-4669.2010.00269.x" @default.
• W2098097608 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21244621" @default.
• W2098097608 hasPublicationYear "2011" @default.
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