The Effects of Leaf Roughness, Surface Free Energy and Work of Adhesion on Leaf Water Drop Adhesion

Wang, Huixia; Shi, Hui; Li, Yangyang; Wang, Yanhui

doi:10.1371/journal.pone.0107062

Cited by 78 publications

(97 citation statements)

References 38 publications

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“…Leaf or plant samples were stored in a portable cool box and were immediately transported to the laboratory and kept in a freezer at 4°C, before all the measurements were completed within 2 days after sampling (Wang, Shi, et al, 2013;Wang, Shi, Li, & Wang, 2014). Leaf or plant samples were stored in a portable cool box and were immediately transported to the laboratory and kept in a freezer at 4°C, before all the measurements were completed within 2 days after sampling (Wang, Shi, et al, 2013;Wang, Shi, Li, & Wang, 2014).…”

Section: Plant Species and Samplingmentioning

confidence: 99%

“…Similarly, the leaf surface retention of Ulmus pumila was found to be 60% greater than that of Catalpa speciosa, and the adaxial contact angles of Catalpa speciosa was more than double the Ulmus pumila at the same time (Holder, 2012). The plant traits considered did not include some leaf surface properties such as water droplet retention, leaf roughness, or surface free energy (Wang et al, 2014). However, the correlation was not statistically significant (p > 0.05), and the relationship between leaf hydrophobicity with individual plant surface retention were not compared.…”

Section: Relationships Between Leaf Wettability and Surface Water Rmentioning

confidence: 99%

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Variability in leaf wettability and surface water retention of main species in semiarid Loess Plateau of China

et al. 2018

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Leaf wettability, adhesion or repulsion of water drops, varies greatly among species and plays an important role in plant-soil hydrological relations. This study aimed to examine the variability in leaf wettability among species in different habitats and growth periods, and their relationships with plant surface water retention in the semiarid Loess Plateau of China. The leaf adaxial and abaxial contact angles, the surface water retention of leaves and individual plants, and general plant traits of 68 species belonging to 28 families were examined from May to August in 2017. Results showed that leaf water contact angles ranged from 27.3°to 133.4°and leaves with higher contact angles normally had lower variation coefficients. Leaf wettability was affected by internal properties (including leaf side, family, and leaf age) and external conditions (growth period), whereas the life form and slope aspect did not show significant effects. There were 47 species having higher contact angles on adaxial than abaxial surfaces, and the differences were significant in 23 species. Gramineous and leguminous species were more unwettable than compositae and rosaceous species. New leaves were more unwettable than old leaves. Surface wettability increased from May-June to July-August period. Leaf wettability was positively correlated with leaf surface water retention and was the best predictor of individual plant surface water retention compared with other plant traits. Leaf wettability showed interspecific differences associated with family and growth stage and can be a considerable variable in predicting canopy interception and evaluating vegetation hydrological function in drought environments.

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Section: Plant Species and Samplingmentioning

confidence: 99%

Section: Relationships Between Leaf Wettability and Surface Water Rmentioning

confidence: 99%

Variability in leaf wettability and surface water retention of main species in semiarid Loess Plateau of China

et al. 2018

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“…Another property of the leaf surface which affects water redistribution is the adhesion of water to the leaf surface which can also contribute to self-purification processes, an important factor in inundated areas. A parameter found to be positively correlated with adhesion forces is the surface free energy (SFE) (Wang et al 2014). Plant leaves characterized by high SFE hold water droplets to their surface.…”

Section: Introductionmentioning

confidence: 99%

Variation in Leaf Surface Hydrophobicity of Wetland Plants: the Role of Plant Traits in Water Retention

et al. 2017

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Leaf surface wetness has numerous physiological and ecological consequences, and the morphological structures on the leaf surface can affect its extent and duration, contributing to interception rates in the scale of the whole ecosystem. Wetland plants have developed morphological adaptations to high water level allowing them to avoid water excess. Droplet contact angle and surface free energy are measurable parameters which relate to how the plant influences water usage and redistribution. We analysed patterns of contact angle and the surface free energy of the adaxial and abaxial surface of 10 wetland plant species and related them to the optimal habitat conditions and functional traits of the plants. Despite the consistent environment of these plants, we found them to vary greatly in terms of leaf surface wettability and surface free energy, with contact angles ranging from 75 to 169°and surface free energy, from 1.32 to 30.38 mJ/m 2 . Canopy height and leaf longevity were significantly correlated to leaf wettability, whilst SLA (Specific Leaf Area) and leaf shape were not related to hydrophobicity. Investigating adaptations of wetland plants to their environment showed that including wettability and surface free energy in combination with other plant traits improves our understanding of water plant-soil-water interactions in wetland habitats.

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“…Wang et al (2014) observed that convex epidermal cells with wax crystals of Cynanchum chinense and Anemone vitifolia had higher CAs than leaves with smooth epidermal cells of Populus simonii and Cynanchum komarovii.…”

Section: Discussionmentioning

confidence: 92%

“…The cuticular waxes vary considerably between and among different species. Cuticular waxes change during leaf developmental stages and between leaf sides (Wang et al 2013(Wang et al , 2014(Wang et al , 2015. The CAs of Nelumbo nucifera and Colocasia esculenta were significantly lower than 90° when the wax was removed with acetone from the leaf surface by Burton and Bhushan (2006).…”

Section: Discussionmentioning

confidence: 99%

Contact angle measurements and water drop behavior on leaf surface for several deciduous shrub and tree species from a temperate zone

Papierowska

Szporak-Wasilewska

Szewińska

et al. 2018

Trees

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Key message Leaf CA measurement should take into account angle variation during measurement time. Leaf wettability of common deciduous forest plants is characterized by wetting contact angles ranging from 60° to 140° with a significant variation between species of the same family. Abstract Leaf wettability is an important phenomenon that has an influence on several processes such as the hydrological cycle, plant pathogen growth, or pollutant and pesticide absorption/deposition. The main objective of this research was to investigate the leaf wettability differences of 19 species (16 trees and 3 shrubs) of deciduous plants commonly occurring in Polish forests (temperate climate). The measurements were gathered as follows: 20 undamaged leaves were selected for each species and the wettability was determined by contact angle measurements with an optical goniometer CAM 100 using the sessile drop method. The contact angle was measured with 1-s intervals during 2 min from droplet deposition on adaxial and abaxial leaf surface. Laboratory analyses were completed during the summer of 2016 during full vegetation growth. A general CA decrease with time was observed on both leaf sides. The contact angle values ranged from 60° to 140° depending on species and leaf side. Differences between contact angle values at the beginning and the end of measurement reached 23.6° and engendered changes of wetting classes for some species. In many cases, no wettability class change was observed despite a CA lowering of 20°. The abaxial side was found to be the more repellent for 14 out of 19 species. Altogether, the leaves were classified from highly wettable to highly non-wettable, probably depending on the plant-survival strategy.

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The Effects of Leaf Roughness, Surface Free Energy and Work of Adhesion on Leaf Water Drop Adhesion

Cited by 78 publications

References 38 publications

Variability in leaf wettability and surface water retention of main species in semiarid Loess Plateau of China

Variability in leaf wettability and surface water retention of main species in semiarid Loess Plateau of China

Variation in Leaf Surface Hydrophobicity of Wetland Plants: the Role of Plant Traits in Water Retention

Contact angle measurements and water drop behavior on leaf surface for several deciduous shrub and tree species from a temperate zone

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