Determining Transpiration from<i>Pinus patula</i>Shoots—A Comparative Evaluation of the Cut-Shoot Method and Two Null-Balance Diffusion Porometers

Dye, P. J.; Christie, S. I.; Olbrich, B. W.; Ferreira, Eric Victor de Oliveira; Tallon, N.

doi:10.1080/00382167.1990.9629065

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Previous studies have shown that this instrument provides estimates of water volume fluxes consistent with those obtained using independent methods (e.g. Dye et al 1990;Ansley et al 1994). However, it should be noted that in some cases porometric estimates of leaf transpiration rates might substantially deviate from in situ plant transpiration, because of presence of substantial boundary layer resistances.…”

Section: Leaf Transpiration Rate (E L ) Leaf Water Potential (Y Lesupporting

confidence: 61%

Ion-mediated compensation for drought-induced loss of xylem hydraulic conductivity in field-growing plants of Laurus nobilis

Trifil

Nardini

Raimondo

et al. 2011

Functional Plant Biol.

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Xylem cavitation is a common occurrence in drought-stressed plants. Cavitation-induced embolism reduces xylem hydraulic conductivity (k xylem ) and may lead to stomatal closure and reduction of photosynthetic rates. Recent studies have suggested that plants may compensate for k xylem loss through ion-mediated enhancement of the residual water transport capacity of functioning conduits. To test this hypothesis, field-grown laurel (Laurus nobilis L.) plants were subjected to mild drought stress by suspending irrigation. Drought treatment induced a significant increase in xylem embolism compared with control (well watered) plants. Xylem sap potassium concentration ([K + ]) increased during the day both in control and water stressed plants. Midday values of sap [K + ] were significantly higher in water stressed plants. The recorded increase in sap potassium concentration induced significant enhancement of residual k xylem when solutions with different [K + ] were perfused through excised stems sampled in the field and measured in the laboratory. In planta measurements of stem hydraulic conductance revealed no change between water stressed plants and controls. Our data suggest that ion-mediated enhancement of residual k xylem buffered the actual loss of hydraulic conductance suffered by plants during the warmest hours of the day as well as under mild drought stress conditions.

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Section: Leaf Transpiration Rate (E L ) Leaf Water Potential (Y Lesupporting

confidence: 61%

Ion-mediated compensation for drought-induced loss of xylem hydraulic conductivity in field-growing plants of Laurus nobilis

Trifil

Nardini

Raimondo

et al. 2011

Functional Plant Biol.

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“…Recently Dye et al (1990) compared results from the cut-shoot method with two null-balance diffusion porometers. The first assumption is the applicability of the cut-shoot method for transpiration estimations.…”

Section: Discussionmentioning

confidence: 99%

Influence of root density on the critical soil water potential

Шеин

Pachepsky

1995

Plant Soil

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Estimation of root water uptake in crops is important for making many other agricultural predictions. This estimation often involves two assumptions: (1) that a critical soil water potential exists which is constant for a given combination of soil and crop and which does not depend on root length density, and (2) that the local root water uptake at given soil water potential is proportional to root length density.Recent results of both mathematical modeling and computer tomography show that these assumptions may not be valid when the soil water potential is averaged over a volume of soil containing roots. We tested these assumptions for plants with distinctly different root systems. Root water uptake rates and the critical soil water potential values were determined in several adjacent soil layers for horse bean (Viciafaba) and oat (Avena sativa) grown in lysimeters, and for field-grown cotton (Gossypium L.), maize (Zea mays) and alfalfa (Medicago sativa L.) crops. Root water uptake was calculated from the water balance of each layer in lysimeters. Water uptake rate was proportional to root length density at high soil water potentials, for both horse bean and oat plants, but root water uptake did not depend on root density for horse bean at potentials lower than -2 5 kPa. We observed a linear dependency of a critical soil water potential on the logarithm of root length density for all plants studied. Soil texture modified the critical water potential values, but not the linearity of the relationship.

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Determining Transpiration fromPinus patulaShoots—A Comparative Evaluation of the Cut-Shoot Method and Two Null-Balance Diffusion Porometers

Cited by 2 publications

References 7 publications

Ion-mediated compensation for drought-induced loss of xylem hydraulic conductivity in field-growing plants of Laurus nobilis

Ion-mediated compensation for drought-induced loss of xylem hydraulic conductivity in field-growing plants of Laurus nobilis

Influence of root density on the critical soil water potential

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