Changes in leaf hydraulic conductance correlate with leaf vein embolism in Cercis siliquastrum L.

Nardini, Andrea; Salleo, Sebastiano; Raimondo, Fabio

doi:10.1007/s00468-003-0265-z

Cited by 101 publications

(76 citation statements)

References 38 publications

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“…At increasing levels of dehydration, whole plants were equilibrated in dark plastic bags and plant C was determined on one leaf per plant. Two additional leaves of the same plant were excised under water and immediately placed in a beaker containing (1) 1% (w/v) phloxine B (modified after Nardini et al, 2003) to reveal ongoing water transport in the lamina and (2) 0.05% (w/v) safranin (modified after Sperry et al, 1988b) to stain water-conducting conduits in the petioles. Samples were exposed to sunlight for about 10 min.…”

Section: Staining Of Conducting Xylem Elementsmentioning

confidence: 99%

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: Staining Of Conducting Xylem Elementsmentioning

confidence: 99%

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

et al. 2016

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“…According to Hinckley and Braatne (1994), stomatal conductance is inversely correlated with the concentration of carbon dioxide in leaves if tissues are adequately irrigated. Nardini et al (2003) show linear dependence between gas exchange and water vapor conductance and the parameters are closely correlated with each other (r 2 = 0.987, p < 0.01). We found strong positive correlation between g s and C i (r = 0.86) for stem leaf wounded ('Feliks'), while in 'Muller' -they negatively correlated with r = -0.81, which means that the leaves at the rosette stage retained CO 2 during the decrease in g s over 1 st -23 rd min, while the leaves at the flowering stage were losing intercellular CO 2 with a decrease in g s (from 1 st to 6 th min and from 24 th to 63 rd min).…”

Section: Discussionmentioning

confidence: 74%

Response of Gas Exchange to Leaf Piercing Explained by Piecewise Linear Regression for Two Developmental Forms of Rape Plant (Brassica napus L. ssp. oleifera Metzg)

Wenda-Piesik¹,

Krzesiński²,

Nowak³

et al. 2017

Acta Biologica Cracoviensia S. Botanica

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Oilseed rape (Brassica napus L. ssp. oleifera Metzg) was the subject of the study in two forms: winter cv. 'Muller' (at the rosette stage -the first internode BBCH 30 -31) and spring cv. 'Feliks' (at the yellow bud stage BBCH 59). The main gas-exchange parameters, net photosynthetic rate (P N ), transpiration rate (E), stomatal conductance (g s ), and intercellular CO 2 concentration (C i ) were measured on leaves prior to the piercing and immediately after the short-term piercing. The effect of mechanical wounding revealed different progress of the gas exchange process for the two forms. Piecewise linear regression with the breakpoint estimation showed that the plants at the same age but at a different vegetal stage, manage mechanical leaf-piercing differently. The differences concerned the stomatal conductance and transpiration changes since for rosette leaves the process consisted of five intervals with a uniform direction, while for stem leaves -of five intervals with a fluctuating direction. These parameters got stabilized within a similar time (220 mins) for both forms. The process of net photosynthetic rate was altered by the plant stages. 'Muller' plants at the rosette stage demonstrated dependence of P N on time in log-linear progression: y (P N ) = 8.01+ 2.73 log 10 (x t 2 ); 7 < t 2 < 220; R 2 = 0.96. For stem leaves of 'Feliks' plants the process of transpiration, in terms of directions, was convergent with the process of photosynthesis. Those two processes were synchronized from 1 st to 114 th min of the test (r = 0.85; p < 0.001) in plants at the rosette stage and from 26 th to 148 th min in stem leaves (r = 0.95; p < 0.001).

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“…The total conductance of a tree or a shoot is calculated as the result conductance of the root, stem, branches, and leave in a series and parallel connection in accordance with tree geometry [91]. Hydraulic models of trees, roots, and leaves are of great interest for plant physiology and agriculture [51,61,79]. Hydraulic approximation is found to be useful for general description of liquid transfer between different conducting elements and organs.…”

Section: Biophysical Theories Of Water Motion and Exchange In Plantsmentioning

confidence: 99%

Long-distance liquid transport in plants

Kizilova¹

2008

Proc. Estonian Acad. Sci.

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Abstract. A brief review of the thermodynamic and fluid dynamic problems related to long-distance liquid flow and signalling in plants is presented. Geometrical parameters of the plant leaf venation are measured and the general relationships between the diameters and lengths of the veins, branching angles at the vein bifurcations, and the corresponding drainage areas are obtained. The same relationships had been obtained before for the bifurcations of the pathways in the arterial and bronchial systems of mammals and humans; tree trunks, branches and roots; and river basins. The identity of the principle of design of the transportation systems in the nature can be understood on the concept of optimal networks that provide liquid delivery at total minimal energy costs. The corresponding models of the optimal vessels and branching systems of vessels with impermeable and permeable walls are presented and discussed.

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Changes in leaf hydraulic conductance correlate with leaf vein embolism in Cercis siliquastrum L.

Cited by 101 publications

References 38 publications

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

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

Response of Gas Exchange to Leaf Piercing Explained by Piecewise Linear Regression for Two Developmental Forms of Rape Plant (Brassica napus L. ssp. oleifera Metzg)

Long-distance liquid transport in plants

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