The characteristics of seasonal and ontogenetic changes in the tissue – water relations of <i>Acer, Populus, Tsuga</i>, and <i>Picea</i>

Tyree, Melvin T.; Cheung, Y. N. S.; MacGregor, Malcolm E.; Talbot, A.

doi:10.1139/b78-071

Cited by 144 publications

(85 citation statements)

References 15 publications

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“…Measurements were made before treatments were imposed (17-18th of February), after drought had been imposed for 8 weeks (7-8th of April) and 2 days after re-watering (11-12th of April). Leaves were rehydrated (Dreyer et al 1990) and pressure-volume curve parameters estimates as previously described (Tyree et al 1978;Robichaux 1984;Kubiske and Abrams 1991).…”

Section: Plant Materials and Treatmentsmentioning

confidence: 99%

Metabolomics demonstrates divergent responses of two Eucalyptus species to water stress

2011

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Past studies of water stress in Eucalyptus spp. generally highlighted the role of fewer than five "important" metabolites, whereas recent metabolomic studies on other genera have shown tens of compounds are affected. There are currently no metabolite profiling data for responses of stress-tolerant species to water stress. We used GC-MS metabolite profiling to examine the response of leaf metabolites to a long (2 month) and severe (^Ppredawn < -2 MPa) water stress in two species of the perennial tree genus Eucalyptus (the mesic Eucalyptus pauciflora and the semi-arid Eucalyptus dumosa). Polar metabolites in leaves were analysed by GC-MS and inorganic ions by capillary electrophoresis. Pressure-volume curves and metabolite measurements showed that water stress led to more negative osmotic potential and increased total osmotically active solutes in leaves of both species. Water stress affected around 3(MK)% of measured metabolites in E. dumosa and 10-15% in E. pauciflora. There were many metabolites that were affected in E. dumosa but

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Section: Plant Materials and Treatmentsmentioning

confidence: 99%

Metabolomics demonstrates divergent responses of two Eucalyptus species to water stress

2011

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“…Osmolality was then multiplied by symplastic water volume and divided by the dry mass of the leaf sample (Tyree et al 1978).…”

Section: Pressure-volume Relationsmentioning

confidence: 99%

Nutrient availability constrains the hydraulic architecture and water relations of savannah trees

Bucci

Scholz

Goldstein

et al. 2006

Plant Cell & Environment

147

108

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Leaf and whole plant-level functional traits were studied in five dominant woody savannah species from Central Brazil (Cerrado) to determine whether reduction of nutrient limitations in oligotrophic Cerrado soils affects carbon allocation, water relations and hydraulic architecture. Four treatments were used: control, N additions, P additions and N plus P additions. Fertilizers were applied twice yearly, from October 1998 to March 2004. Sixty-three months after the first nutrient addition, the total leaf area increment was significantly greater across all species in the N-and the N + P-fertilized plots than in the control and in the Pfertilized plots. Nitrogen fertilization significantly altered several components of hydraulic architecture: specific conductivity of terminal stems increased with N additions, whereas leaf-specific conductivity and wood density decreased in most cases. Average daily sap flow per individual was consistently higher with N and N + P additions compared to the control, but its relative increase was not as great as that of leaf area. Long-term additions of N and N + P caused midday Y L to decline significantly by a mean of 0.6 MPa across all species because N-induced relative reductions in soil-to-leaf hydraulic conductance were greater than those of stomatal conductance and transpiration on a leaf area basis. Phosphorus-fertilized trees did not exhibit significant changes in midday Y L . Analysis of xylem vulnerability curves indicated that N-fertilized trees were significantly less vulnerable to embolism than trees in control and P-fertilized plots. Thus, N-induced decreases in midday Y L appeared to be almost entirely compensated by increases in resistance to embolism. Leaf tissue water relations characteristics also changed as a result of N-induced declines in minimum Y L : osmotic potential at full turgor decreased and symplastic solute content on a dry matter basis increased linearly with declining midday Y L across species and treatments. Despite being adapted to chronic nutrient limitations, Cerrado woody species apparently have the capacity to exploit increases in nutrient availability by allocating resources to maximize carbon gain and enhance growth. The cost of increased allocation to leaf area relative to water transport capacity involved increased total water loss per plant and a decrease in minimum leaf water potentials. However, the risk of increased embolism and turgor loss was relatively low as xylem vulnerability to embolism and leaf osmotic characteristics changed in parallel with changes in plant water status induced by N fertilization.

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“…Values of osmotic potential at full hydration (p sat ) and at zero turgor (p tlp ), relative water content at zero turgor ) were calculated according to Tyree et al (1978): where R is the ideal gas costant, T the absolute temperature and V 0 the volume of the symplast at full turgor:…”

Section: Pressure-volume Curvesmentioning

confidence: 99%

Seasonal patterns of tissue water relations in three Mediterranean shrubs co‐occurring at a natural CO₂ spring

Tognetti

Raschi²,

Jones

2000

Plant Cell & Environment

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Seasonal changes in tissue water relations of Erica arborea L., Myrtus communis L. and Juniperus communis L., grown in a Mediterranean environment, were analysed under field conditions over a 12 month period by comparing plants grown in the proximity of a natural CO 2 spring (about 700 mmol mol -1 atmospheric CO 2 concentration, [CO 2 ]) with plants in ambient conditions. Tissue water relations varied in response to changes in water availability, but the seasonal course of tissue water relations parameters was also related to ontogeny. Tissue water relations of these co-occurring shrubs were not alike. Osmotic potentials and saturated mass/dry mass ratio were lowest during peak drought stress periods. Diurnal changes in osmotic potential at the point of turgor loss were least early in the season, maximal in mid-season, and decreased again in autumn. Turgor potentials decreased as drought progressed and were highest in late fall and mid-winter. Symplastic water fraction was highest in mid-spring for E. arborea and M. communis and decreased during the summer, while the opposite was observed for J. communis. Common to all species, under elevated [CO 2 ], was an increase of turgor pressure, particularly during the summer months. Other parameters showed species-specific responses to long-term elevated [CO 2 ]. In particular, exposure to elevated [CO 2 ] increased osmotic potentials in E. arborea under drought, while the opposite was the case for J. communis. Site differences in predawn to midday shifts were not strong in any of the species. Differences in tissue water relations suggest that the coexistence of these shrubs in the same environment with similar water availability are partially based on differential water relations strategies and water use patterns. Regardless of the mechanisms, growth of these shrubs in elevated [CO 2 ] may be either less, similarly or more affected by drought stress than plants in ambient [CO 2 ] depending on the species and season.

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The characteristics of seasonal and ontogenetic changes in the tissue – water relations of Acer, Populus, Tsuga, and Picea

Cited by 144 publications

References 15 publications

Metabolomics demonstrates divergent responses of two Eucalyptus species to water stress

Metabolomics demonstrates divergent responses of two Eucalyptus species to water stress

Nutrient availability constrains the hydraulic architecture and water relations of savannah trees

Seasonal patterns of tissue water relations in three Mediterranean shrubs co‐occurring at a natural CO₂ spring

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The characteristics of seasonal and ontogenetic changes in the tissue – water relations of Acer, Populus, Tsuga, and Picea

Cited by 144 publications

References 15 publications

Metabolomics demonstrates divergent responses of two Eucalyptus species to water stress

Metabolomics demonstrates divergent responses of two Eucalyptus species to water stress

Nutrient availability constrains the hydraulic architecture and water relations of savannah trees

Seasonal patterns of tissue water relations in three Mediterranean shrubs co‐occurring at a natural CO2 spring

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Seasonal patterns of tissue water relations in three Mediterranean shrubs co‐occurring at a natural CO₂ spring