Water‐Limited Conditions

Yeo, A. R.

doi:10.1002/9780470988862.ch13

Plant Solute Transport 2007

DOI: 10.1002/9780470988862.ch13

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Water‐Limited Conditions

A. R. Yeo¹

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2014

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“…Stuart et al (2007) considered that our values were due to contamination via cell disruption along the cut surface of the shoot. Even more, there is a widespread assertion that the severed living cells of a cut stem will release the contents of vacuoles and organic osmolytes from the pith, parenchyma, and phloem, thus contaminating the xylem vessel sap (Flowers, 1985; Popp et al, 1985; Yeo, 2007). Caution is recommended against the use of the pressure chamber and vacuum techniques to obtain accurate samples of xylem vessel sap (Schurr, 1998), but we were unable to find protocols that test directly whether such contamination occurs.…”

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confidence: 99%

Dynamic control of osmolality and ionic composition of the xylem sap in two mangrove species

López‐Portillo

Ewers

Méndez‐Alonzo

et al. 2014

American J of Botany

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• Premise of the study: Xylem sap osmolality and salinity is a critical unresolved issue in plant function with impacts on transport efficiency, pressure gradients, and living cell turgor pressure, especially for halophytes such as mangrove trees.• Methods: We collected successive xylem vessel sap samples from stems and shoots of Avicennia germinans and Laguncularia racemosa using vacuum and pressure extraction and measured their osmolality. Following a series of extractions with the pressure chamber, we depressurized the shoot and pressurized again after various equilibration periods (minutes to hours) to test for dynamic control of osmolality. Transpiration and final sap osmolality were measured in shoots perfused with deionized water or different seawater dilutions.• Key results: For both species, the sap osmolality values of consecutive samples collected by vacuum extraction were stable and matched those of the initial samples extracted with the pressure chamber. Further extraction of samples with the pressure chamber decreased sap osmolality, suggesting reverse osmosis occurred. However, sap osmolalities increased when longer equilibration periods after sap extraction were allowed. Analysis of expressed sap with HPLC indicated a 1:1 relation between measured osmolality and the osmolality of the inorganic ions in the sap (mainly Na, K, and Cl), suggesting no contamination by organic compounds. In stems perfused with deionized water, the sap osmolality increased to mimic the native sap osmolality.• Conclusions: Xylem sap osmolality and ionic contents are dynamically adjusted by mangroves and may help modulate turgor pressure, hydraulic conductivity, and water potential, thus being important for mangrove physiology, survival, and distribution.

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mentioning

confidence: 99%

Dynamic control of osmolality and ionic composition of the xylem sap in two mangrove species

López‐Portillo

Ewers

Méndez‐Alonzo

et al. 2014

American J of Botany

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Water‐Limited Conditions

Cited by 1 publication

References 71 publications

Dynamic control of osmolality and ionic composition of the xylem sap in two mangrove species

Dynamic control of osmolality and ionic composition of the xylem sap in two mangrove species

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