Hierarchical statistical modeling of xylem vulnerability to cavitation

Ogle, Kiona; Barber, Jarrett J.; Willson, Cynthia J.; Thompson, Brenda

doi:10.1111/j.1469-8137.2008.02760.x

Cited by 62 publications

(64 citation statements)

References 66 publications

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“…Thresholds were computed after fitting the reparameterized Weibull function (Ogle et al, 2009) (Nolf et al, 2015). Although some of these species also had very vulnerable leaves at P k50 of 21 MPa or greater (Hao et al, 2008;Chen et al, 2009;Blackman et al, 2012;Guyot et al, 2012), the majority of previously studied species exhibited P k50 of 21.5 MPa or less and down to 24.3 MPa (Sack and Holbrook, 2006;Blackman et al, 2010;Johnson et al, 2012;Nardini et al, 2012;Bucci et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

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Herb Hydraulics: Inter- and Intraspecific Variation in Three Ranunculus Species

et al. 2016

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(S.M.).The requirements of the water transport system of small herbaceous species differ considerably from those of woody species. Despite their ecological importance for many biomes, knowledge regarding herb hydraulics remains very limited. We compared key hydraulic features (vulnerability to drought-induced hydraulic decline, pressure-volume relations, onset of cellular damage, in situ variation of water potential, and stomatal conductance) of three Ranunculus species differing in their soil humidity preferences and ecological amplitude. All species were very vulnerable to water stress (50% reduction in whole-leaf hydraulic conductance [k leaf ] at 20.2 to 20.8 MPa). In species with narrow ecological amplitude, the drought-exposed Ranunculus bulbosus was less vulnerable to desiccation (analyzed via loss of k leaf and turgor loss point) than the humidhabitat Ranunculus lanuginosus. Accordingly, water stress-exposed plants from the broad-amplitude Ranunculus acris revealed tendencies toward lower vulnerability to water stress (e.g. osmotic potential at full turgor, cell damage, and stomatal closure) than conspecific plants from the humid site. We show that small herbs can adjust to their habitat conditions on interspecific and intraspecific levels in various hydraulic parameters. The coordination of hydraulic thresholds (50% and 88% loss of k leaf , turgor loss point, and minimum in situ water potential) enabled the study species to avoid hydraulic failure and damage to living cells. Reversible recovery of hydraulic conductance, desiccation-tolerant seeds, or rhizomes may allow them to prioritize toward a more efficient but vulnerable water transport system while avoiding the severe effects that water stress poses on woody species.

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Section: Discussionmentioning

confidence: 99%

“…(Wheeler et al, 2013) was expected for leaves excised under water (Scoffoni and Sack, 2015). The reparameterized Weibull function (Ogle et al, 2009) was fitted to plots of relative k leaf versus C using the fitplc package for R version 3.1.1 (Duursma, 2014;R Core Team, 2014):…”

Section: Leaf Hydraulic Vulnerabilitymentioning

confidence: 99%

Herb Hydraulics: Inter- and Intraspecific Variation in Three Ranunculus Species

et al. 2016

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“…All vulnerability curves were fitted using a Weibull function as reparameterized by Ogle et al (2009):…”

Section: Curve Fittingmentioning

confidence: 99%

Noninvasive Measurement of Vulnerability to Drought-Induced Embolism by X-Ray Microtomography

et al. 2015

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Hydraulic failure induced by xylem embolism is one of the primary mechanisms of plant dieback during drought. However, many of the methods used to evaluate the vulnerability of different species to drought-induced embolism are indirect and invasive, increasing the possibility that measurement artifacts may occur. Here, we utilize x-ray computed microtomography (microCT) to directly visualize embolism formation in the xylem of living, intact plants with contrasting wood anatomy (Quercus robur, Populus tremula 3 Populus alba, and Pinus pinaster). These observations were compared with widely used centrifuge techniques that require destructive sampling. MicroCT imaging provided detailed spatial information regarding the dimensions and functional status of xylem conduits during dehydration. Vulnerability curves based on microCT observations of intact plants closely matched curves based on the centrifuge technique for species with short vessels (P. tremula 3 P. alba) or tracheids (P. pinaster). For ring porous Q. robur, the centrifuge technique significantly overestimated vulnerability to embolism, indicating that caution should be used when applying this technique to species with long vessels. These findings confirm that microCT can be used to assess the vulnerability to embolism on intact plants by direct visualization.

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“…In order to determine which xylem tension drives the loss of conductivity, the minimum and the last recorded stem water potentials were related to PLC. This relation was assessed fitting a Weibull function as commonly used for vulnerability curves [54]:…”

Section: Statistical Analysesmentioning

confidence: 99%

Responses of Contrasting Tree Functional Types to Air Warming and Drought

Martínez-Sancho

Navas

Seidel

et al. 2017

Forests

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Climate change-induced rise of air temperatures and the increase of extreme climatic events, such as droughts, will largely affect plant growth and hydraulics, leading to mortality events all over the globe. In this study, we investigated the growth and hydraulic responses of seedlings of contrasting functional types. Pinus sylvestris, Quercus spp. and Castanea sativa seedlings were grown in a common garden experiment under four treatments: control, air warming, drought and their combination during two consecutive growing periods. Height and diameter increments, stomatal conductance and stem water potentials were measured during both growing seasons. Additionally, hydraulic parameters such as xylem-specific native and maximum hydraulic conductivities, and native percentage of loss of conductivity were measured at the end of the entire experiment. Our results clearly pointed to different adaptive strategies of the studied species. Scots pine displayed a relatively isohydric behavior with a strict stomata control prohibiting native embolism whereas sweet chestnut and oak as relatively anisohydric species displayed an increased loss of native conductivity as a results of low water potentials. Seasonal timing of shoot and diameter growth also differed among functional types influencing drought impacts. Additionally, the possibility of embolism reversal seemed to be limited under the study conditions.

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Hierarchical statistical modeling of xylem vulnerability to cavitation

Cited by 62 publications

References 66 publications

Herb Hydraulics: Inter- and Intraspecific Variation in Three Ranunculus Species

Herb Hydraulics: Inter- and Intraspecific Variation in Three Ranunculus Species

Noninvasive Measurement of Vulnerability to Drought-Induced Embolism by X-Ray Microtomography

Responses of Contrasting Tree Functional Types to Air Warming and Drought

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