Derivation of Pressure-Volume Curves by a Non-Linear Regression Procedure and Determination of Apoplastic Water

Andersen, M. N.; Jensen, C. R.; Lösch, R.

doi:10.1093/jxb/42.2.159

Cited by 41 publications

(38 citation statements)

References 13 publications

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“…However, our finding of the importance of cell shrinkage instead emphasizes potential convergence, not diversity, in these thresholds across the tested species. The decline of RWC associated with ABA accumulation was 3% to 16% across the four species tested , corresponding to symplastic RWC declines of 10% to 22% (Table II), although we note that calculating symplastic RWC entails estimating apoplastic water fraction by extrapolating pressure-volume curves, which contributes a level of uncertainty (Andersen et al, 1991;Wardlaw, 2005). Further, the intervals of external pressure applied in the experiments to determine the thresholds for ABA accumulation were rather wide, and higher resolution studies may show the range of RWC decline associated with ABA accumulation across diverse angiosperms to be yet narrower.…”

Section: Speciesmentioning

confidence: 99%

The natural and social history of the indigenous lands and protected areas corridor of the Xingu River basin

Schwartzman

Boas

Ono

et al. 2013

Phil. Trans. R. Soc. B

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The 280 000 km² Xingu indigenous lands and protected areas (ILPAs) corridor, inhabited by 24 indigenous peoples and about 215 riverine (ribeirinho) families, lies across active agriculture frontiers in some of the historically highest-deforestation regions of the Amazon. Much of the Xingu is anthropogenic landscape, densely inhabited and managed by indigenous populations over the past millennium. Indigenous and riverine peoples' historical management and use of these landscapes have enabled their long-term occupation and ultimately their protection. The corridor vividly demonstrates how ILPAs halt deforestation and why they may account for a large part of the 70 per cent reduction in Amazon deforestation below the 1996–2005 average since 2005. However, ongoing and planned dams, road paving, logging and mining, together with increasing demand for agricultural commodities, continued degradation of upper headwaters outside ILPA borders and climate change impacts may render these gains ephemeral. Local peoples will need new, bottom-up, forms of governance to gain recognition for the high social and biological diversity of these territories in development policy and planning, and finance commensurate with the value of their ecosystem services. Indigenous groups' reports of changing fire and rainfall regimes may themselves evidence climate change impacts, a new and serious threat.

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Section: Speciesmentioning

confidence: 99%

The natural and social history of the indigenous lands and protected areas corridor of the Xingu River basin

Schwartzman

Boas

Ono

et al. 2013

Phil. Trans. R. Soc. B

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“…Additionally, we calculated the water use intrinsic efficiency as A/gs (WUIE, mol mol -1 ), and apparent carbolixilation efficiency as A/Ci (ACE, mol L -1 ) at light saturation point, where A=net CO2 assimilation, gs=stomatal conductance, and Ci=intercellular CO2 concentration. The cell wall elasticity module ( ), osmotic potential at saturation ( s), turgor loss point (TLP) and maximum symplastic water fraction (Ws) were derived from pressure-volume (PV) curves according to SCHULTE & HINCKLEY (1985) and ANDERSEN et al (1991).…”

Section: Methodsmentioning

confidence: 99%

Tolerance to water deficiency between two soybean cultivars: transgenic versus conventional

et al. 2011

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“…Methods now exist to quantify the effect of embolism on 1 Financial support was provided by Institut National de la Recherche Agronomique.…”

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confidence: 99%

Use of Positive Pressures to Establish Vulnerability Curves

Cochard¹,

Cruiziat²,

Tyree³

1992

Plant Physiol.

288

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Loss of hydraulic conductivity occurs in stems when the water in xylem conduits is subjected to sufficiently negative pressure. According to the air-seeding hypothesis, this loss of conductivity occurs when air bubbles are sucked into water-filled conduits through micropores adjacent to air spaces in the stem. Results in this study showed that loss of hydraulic conductivity occurred in stem segments pressurized in a pressure chamber while the xylem water was under positive pressure. Vulnerability curves can be defined as a plot of percentage loss of hydraulic conductivity versus the pressure difference between xylem water and the outside air inducing the loss of conductivity. Vulnerability curves were similar whether loss of conductivity was induced by lowering the xylem water pressure or by raising the external air pressure. These results are consistent with the air-seeding hypothesis of how embolisms are nucleated, but not with the nucleation of embolisms at hydrophobic cracks because the latter requires negative xylem water pressure. The results also call into question some basic underlying assumptions used in the determination of components of tissue water potential using "pressure-volume" analysis.

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Derivation of Pressure-Volume Curves by a Non-Linear Regression Procedure and Determination of Apoplastic Water

Cited by 41 publications

References 13 publications

The natural and social history of the indigenous lands and protected areas corridor of the Xingu River basin

The natural and social history of the indigenous lands and protected areas corridor of the Xingu River basin

Tolerance to water deficiency between two soybean cultivars: transgenic versus conventional

Use of Positive Pressures to Establish Vulnerability Curves

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