Publication Type: | Journal Article |
Year of Publication: | 2010 |
Authors: | CAI, JING, TYREE, MELVINT |
Journal: | Plant, Cell & Environment |
Volume: | 33 |
Issue: | 7 |
Date Published: | 2010 |
ISBN Number: | 1365-3040 |
Keywords: | air-seeding hypothesis, pit area hypothesis, Populus, Populus tremuloides, vessel diameter, Weibull functions |
Abstract: | The objective of this study was to quantify the relationship between vulnerability to cavitation and vessel diameter within a species. We measured vulnerability curves (VCs: percentage loss hydraulic conductivity versus tension) in aspen stems and measured vessel-size distributions. Measurements were done on seed-grown, 4-month-old aspen (Populus tremuloides Michx) grown in a greenhouse. VCs of stem segments were measured using a centrifuge technique and by a staining technique that allowed a VC to be constructed based on vessel diameter size-classes (D). Vessel-based VCs were also fitted to Weibull cumulative distribution functions (CDF), which provided best-fit values of Weibull CDF constants (c and b) and P50 = the tension causing 50% loss of hydraulic conductivity. We show that P50 = 6.166D−0.3134 (R2 = 0.995) and that b and 1/c are both linear functions of D with R2 > 0.95. The results are discussed in terms of models of VCs based on vessel D size-classes and in terms of concepts such as the ‘pit area hypothesis’ and vessel pathway redundancy. |
URL: | http://dx.doi.org/10.1111/j.1365-3040.2010.02127.x |
Short Title: | Plant, Cell & Environment |
The impact of vessel size on vulnerability curves: data and models for within-species variability in saplings of aspen, Populus tremuloides Michx
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