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8 results for “turgor loss point”
Drought survival is positively associated with high turgor loss points in temperate perennial grassland species
<p>1. Turgor loss point (π<sub>tlp</sub>) has been suggested to be a key trait for drought resistance in woody species. In herbaceous grassland species the role of π<sub>tlp</sub> for species drought survival has not yet been tested, although grasslands are projected to experience more frequent and intense droughts with climate change.</p> <p>2. To gain insights into the role of π<sub>tlp</sub> for drought resistance of temperate perennial grassland species, we assessed π<sub>tlp</sub> of 41 species common in Germany (20 forbs, 21 grasses). We directly related them to the species' comparative whole-plant drought survival and midday leaf water potentials under drought (Ψ<sub>MD</sub>) assessed in a common garden drought experiment, and to species moisture association.</p> <p>3. Species drought survival increased with increasing π<sub>tlp</sub> across all species as well as within forbs or grasses separately. Ψ<sub>MD</sub> was positively related to π<sub>tlp</sub> and drought survival. Our results imply that high π<sub>tlp</sub> promotes drought survival of common perennial European temperate mesic grassland species by enabling them to maintain high leaf water potentials under drought, i.e., a desiccation avoidance strategy. However, π<sub>tlp</sub> was not related to species moisture association.</p> <p>4. The positive relationship between π<sub>tlp</sub> and drought survival in herbaceous grassland species was opposite to the negative relationship previously established in woody plants, implying that mechanisms of drought resistance differ between woody and herbaceous species. Our results highlight the necessity of directly testing the relationship of functional traits to whole-plant drought survival in different plant life forms, before using trait assessments for predicting plant responses to drought.</p>
Data from "Projections of leaf turgor loss point shifts under future climate change scenarios" (Tordoni et al. 2022 Global Change Biology)
<p>The dataset includes four sheets representing the average turgor loss point (tlp) values at grid cell level (tlp_data) and the climatic variables and related climate change scenarios derived from the three models used in this study (HadGEM2-ES-RACMO22E, EC-EARTH_RACMO22E, EC-EARTH_CCLM4-8-17, respectively).</p> <p>The sheet "tlp_data" reports the cell ID (OGU) and the average tlp values for each taxonomic group considered in this study (gymnosperms, angiosperms, herbaceous and woody angiosperms). </p> <p>Each of the other three sheets reports the cell ID (OGU), coordinates of the cell centroid (Long, Lat) and a set of six climatic variables: 95<sup>th</sup> percentiles of average temperature (BIO1.95, °C), temperature seasonality (BIO4, °C), annual consecutive frost days where temperature was ≤ 0 °C (CFD.ann, n° days), annual consecutive dry days where precipitation was < 1 mm (CDD.ann, n° days), 5<sup>th</sup> percentiles of cumulate annual precipitation (BIO12.5, mm), and precipitation seasonality (BIO15, %). For each model, "hist" refers to historical data encompassing the period 1970-2005, whereas "RCP2.6" and "RCP8.5" reports the average value of future projections for the period 2080-2100 in two representative concentration pathway (RCP) scenarios (RCP2.6 and RCP8.5).</p> <p> </p>
Data from: Predicting climatic limits along a rainfall gradient of dipterocarp species based on leaf turgor loss point
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Drought survival is positively associated with high turgor loss points in temperate perennial grassland species
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Data from: Dry-season decline in tree sapflux is correlated with leaf turgor loss point in a tropical rainforest
1. Water availability is a key determinant of forest ecosystem function and tree species distributions. While droughts are increasing in frequency in many ecosystems, including in the tropics, plant responses to water supply vary with species and drought intensity, and are therefore difficult to model. Based on physiological first principles, we hypothesized that trees with a lower turgor loss point (πtlp), i.e., a more negative leaf water potential at wilting, would maintain water transport for longer into a dry season. 2. We measured sapflux density of 22 mature trees of 10 species during a dry season in an Amazonian rainforest, quantified sapflux decline as soil water content decreased, and tested its relationship to tree πtlp, size, and leaf predawn and midday water potentials measured after the onset of the dry season. 3. The measured trees varied strongly in the response of water use to the seasonal drought, with sapflux at the end of the dry season ranging from 37 to 117% (on average 83 ± 5 %) of that at the beginning of the dry season. The decline of water transport as soil dried was correlated with tree πtlp (Spearman ρ≥0.63), but not with tree size or predawn and midday water potentials. Thus, trees with more drought-tolerant leaves better maintained water transport during the seasonal drought. 4. Our study provides an explicit correlation between a trait, measurable at the leaf level, and whole-plant performance under drying conditions. Physiological traits such as πtlp can be used to assess and model higher-scale processes in response to drying conditions.
Turgor loss point predicts survival responses to experimental and natural drought in tropical tree seedlings
<p>Identifying key traits that can serve as proxies for species drought resistance is crucial for predicting and mitigating effects of climate change in diverse plant communities. Turgor loss point (π<sub>tlp</sub>) is a recently emerged trait that has been linked to species distributions across gradients of water availability. However, a direct relationship between π<sub>tlp</sub> and species ability to survive drought has yet to be established for woody species. Using a manipulative field experiment to quantify species drought resistance (i.e. their survival response to drought), combined with measurements of π<sub>tlp</sub> for 16 tree species, we show a negative relationship between π<sub>tlp</sub> and seedling drought resistance. Using long-term forest plot data, we also show that π<sub>tlp</sub> predicts seedling survival responses to a severe El Niño-related drought, although additional factors are clearly also important. Our study demonstrates that species with lower π<sub>tlp</sub> exhibit higher survival under both experimental and natural drought. These results provide a missing cornerstone in the assessment of the traits underlying drought resistance in woody species and strengthen π<sub>tlp</sub> as a proxy for evaluating which species will lose or win under projections of exacerbating drought regimes.</p>
Turgor loss point predicts survival responses to experimental and natural drought in tropical tree seedlings
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Data from: Dry-season decline in tree sapflux is correlated with leaf turgor loss point in a tropical rainforest
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