Stomatal response functions to environmental stress of dominant species in the tropical Andean páramo

Sandoval, David; Rada, Fermín; Sarmiento, Lina

doi:10.1080/17550874.2019.1683094

Cited by 11 publications

(7 citation statements)

References 49 publications

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“…Key traits may relax the niche conservatism assumption by conferring the ability to colonize new habitats. For instance, underground plant-soil interactions (Goh et al, 2013;Sedlacek et al, 2014;Little et al, 2016) across different water levels (Geange et al, 2017) and cellular-anatomical physiological adaptations (Sandoval et al, 2019) may serve as pre-adaptations for a wider range expansion (Cuesta et al, 2017). Plastic traits may also broad the spectrum of novel climates (Arnold et al, 2019).…”

Section: Range Losses In the Espeletia Complex Will Widespread Througmentioning

confidence: 99%

“…This local-scale environmental trend has diversity implications for other endemic plant species in the northern Andes (Cortés et al, 2012a,b;Blair et al, 2016). Besides high-resolution environmental data, eco-physiological (Llambí and Rada, 2019;Sandoval et al, 2019) and ecological adaptive traits (e.g., Bruelheide et al, 2018;Cortés and Blair, 2018) must be noted more systematically at local scales in natural surveys and field tests, like reciprocal transplant assays of ecotypes among microhabitats (as in Sedlacek et al, 2015), and space-by-time substitution trials across altitudes (Cuesta et al, 2017) and habitats (Wheeler et al, 2014(Wheeler et al, , 2016. Ultimately, micro-scales keep genetic variance (Cortés et al, 2011(Cortés et al, , 2018bGaleano et al, 2012;Kelleher et al, 2012;Blair et al, 2013Blair et al, , 2018Cortés, 2013;Wu et al, 2020), morphological diversity, and adaptive trait variation (Sedlacek et al, 2016;Pacifici et al, 2017).…”

Section: Perspectivesmentioning

confidence: 99%

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Climate Vulnerability Assessment of the Espeletia Complex on Páramo Sky Islands in the Northern Andes

et al. 2020

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Section: Range Losses In the Espeletia Complex Will Widespread Througmentioning

confidence: 99%

Section: Perspectivesmentioning

confidence: 99%

Climate Vulnerability Assessment of the Espeletia Complex on Páramo Sky Islands in the Northern Andes

et al. 2020

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“…Similarly, erect shrubs in the Venezuelan paramo develop resistance to drought at high elevations 82 (Sandoval et al 2019). In Bolivia above 5000 m, the woody Polylepis tarapacana Phil.…”

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confidence: 99%

Aboveground-trait variations in 11 (sub)alpine plants along a 1000-m elevation gradient in tropical Mexico

et al. 2021

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With the aim to explore how plants acclimate to elevation changes in the understudied (sub)alpine tropics we tested two hypotheses along a 1000-m elevation gradient in Mexico: (H1) due to a severe increase in abiotic constraints at higher elevations, the functional traits of the plant species will converge toward more resource conservation, and (H2) the specific growth forms and biogeographic origins present in the (sub)alpine tropics may influence the interspecific trait variation along the gradient. We measured five aboveground functional traits: specific leaf area (SLA), leaf dry-matter content (LDMC), leaf thickness, leaf area and plant height, of 11 species representing fourPowered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation growth forms: rosette, tussock grass, shrub and tree the soil microclimate. Microclimatic data revealed a steep decrease in soil water content at higher elevations. Across all species and all individuals, SLA, plant height and leaf area decreased with elevation whereas LDMC and leaf thickness increased, all of which revealing adjustments towards resource conservation in line with H1. Consistently with H2, the functional traits of the growth forms that were characteristic of tropical alpine regions (tussock grasses and erect shrubs) were less sensitive to changes in elevation compared to more generalist growth forms such as forbs. Also, within the growth form "rosette" the functional traits of species of tropical biogeographic origin changed with elevation whereas those of Holarctic origin did not. Our Mexican data indicate a convergence of plant traits toward improved resource conservation at higher elevations, which may be influenced partially by the growth form and the biogeographical origin of plant species.

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“…The reverse mechanism takes place under water scarcity. Stomatal opening and closing can be assessed through the evolution of Rs which defines the plant-atmosphere interactions, strongly influencing the rate of gas exchange, and hence, photosynthesis and transpiration [55,56].…”

Section: Resultsmentioning

confidence: 99%

Tolerance to Drought and Water Stress Resistance Mechanism of Castor Bean

et al. 2020

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Castor bean (Ricinus communis L.) is a multipurpose crop; its oil has numerous applications worldwide and the last decade demonstrated a growing international demand. The aim of this work was to investigate the level of castor bean tolerance to drought and its possession of a water stress resistance mechanism by applying three different water regimes in a glasshouse pot experiment conducted for two years. The treatments applied were 70% (T70-control), 55% (T55) and 40% (T40) of the available soil moisture. The results showed that the growth parameters height, trunk diameter, and fresh and dry weights of leaves and stems were not affected by the moderate water scarcity (T55), while they were significantly decreased by T40. Significant decrease in leaf number was observed in both T55 (17%) and T40 (27%) plants, with a delay of 4 weeks in the lower treated plants. Leaf area was decreased by 54% and 20% in T55 and T40 respectively, indicating that its reduction was mainly due to a reduction of leaf size than of leaf number. The leaf water potential was increased negatively with increasing stress, showing a water loss and decrease of turgidity in cells. Stomatal resistance was significantly higher at the higher water scarcity and this response indicates a water stress resistance mechanism. This result was also confirmed by the regression analysis performed between stomatal resistance and leaf water potential. In conclusion, castor bean showed a tolerance ability under water stress conditions and its early physiological reaction allows its acclimatization to drought conditions.

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Stomatal response functions to environmental stress of dominant species in the tropical Andean páramo

Cited by 11 publications

References 49 publications

Climate Vulnerability Assessment of the Espeletia Complex on Páramo Sky Islands in the Northern Andes

Climate Vulnerability Assessment of the Espeletia Complex on Páramo Sky Islands in the Northern Andes

Aboveground-trait variations in 11 (sub)alpine plants along a 1000-m elevation gradient in tropical Mexico

Tolerance to Drought and Water Stress Resistance Mechanism of Castor Bean

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