Tree leaves as a habitat for phyllobacteria

Coutinho, Teresa A.; Bophela, Khumbuzile N.

doi:10.1016/b978-0-12-822542-4.00001-2

Cited by 6 publications

(22 citation statements)

References 108 publications

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“…The phyllosphere is a unique environment because of its structure, ecology, the accessibility of nutrients and humidity, and the impact of meteorological factors and solar radiation [ 41 ]. On the one hand, the leaves’ environment is relatively hostile to the microorganisms; on the other hand, the host plant provides the microorganisms with nutrients and shelter [ 44 ]. One can hypothesize that road dust is characterized by more extreme conditions in terms of microclimatic factors and nutrients supply, and that such conditions can limit the Chao1 richness and Shannon diversity of microbial communities.…”

Section: Discussionmentioning

confidence: 99%

Diversity of Microbial Communities, PAHs, and Metals in Road and Leaf Dust of Functional Zones of Moscow and Murmansk

et al. 2023

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The impact of geographical factors, functional zoning, and biotope type on the diversity of microbial communities and chemical components in the dust of urban ecosystems was studied. Comprehensive analyses of bacterial and fungal communities, polycyclic aromatic hydrocarbons (PAHs), and metals in road and leaf dust in three urban zones of Murmansk and Moscow with contrasting anthropogenic load were conducted. We found that the structure of bacterial communities affected the functional zoning of the city, biotope type, and geographical components. Fungal communities were instead impacted only by biotope type. Our findings revealed that the structure of fungal communities was mostly impacted by PAHs whereas bacterial communities were sensitive to metals. Bacteria of the genus Sphingomonas in road and leaf dust as indicators of the ecological state of the urban ecosystems were proposed.

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Section: Discussionmentioning

confidence: 99%

Diversity of Microbial Communities, PAHs, and Metals in Road and Leaf Dust of Functional Zones of Moscow and Murmansk

et al. 2023

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“…48,59−62 Additional variables impacting the cuticle's structure include epidermal cell type, leaf age, light exposure, and the presence of phyllosphere microorganisms, among other things. 61 Cuticles consist of two key ingredients: cutin and waxes (Figure 2). 35,36,66−68 Cutin is an amorphous polyester of C 16 and C 18 ω-hydroxycarboxylic acids, both of which can have midchain hydroxy, epoxy, and carbonyl functionalities that act as polymer branching points or hydrophilic sites.…”

Section: Chemistry and Morphologymentioning

confidence: 99%

“…Important classes include extracellular polymeric substances (EPS), surfactants, and plant hormones. 1,61 EPS are major biofilm components on a per-mass basis (50−90%) 144,145 and are crucial to keeping bacterial cells hydrated. 1 This polymeric matrix has a complex and dynamic composition and includes functionalized polysaccharides, proteins, nucleic acids, phospholipids, and traces of humic substances.…”

Section: Phyllosphere Microorganismsmentioning

confidence: 99%

“…145−147 Surfactants help cells access water and nutrients either by softening the cuticle (see also section 4.2.2), reducing water tension (thus, allowing bacteria to relocate where nutrients are more abundant), or increasing water availability. 61,148,149 For example, syringafactin, a hygroscopic surfactant produced by Pseudomonas syringae, can absorb water up to 250% of its weight at high relative humidity. 149 Some phyllosphere organisms also produce volatile organic compounds (reviewed by Farre-Armengol et al 150 ) and auxin, a nonvolatile plant hormone that stimulates the release of saccharides from the plant cell wall and helps alleviate nutrient limitations.…”

Section: Phyllosphere Microorganismsmentioning

confidence: 99%

“…Cuticles cover all aerial parts of plants; their thickness, chemistry, and morphology differ depending on plant species, organ, developmental stage, and climatic factors. ,− Additional variables impacting the cuticle’s structure include epidermal cell type, leaf age, light exposure, and the presence of phyllosphere microorganisms, among other things …”

Section: Leaf Surfacementioning

confidence: 99%

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The Chemical Landscape of Leaf Surfaces and Its Interaction with the Atmosphere

Ossola,

Farmer

2024

Chem. Rev.

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Atmospheric chemists have historically treated leaves as inert surfaces that merely emit volatile hydrocarbons. However, a growing body of evidence suggests that leaves are ubiquitous substrates for multiphase reactions−implying the presence of chemicals on their surfaces. This Review provides an overview of the chemistry and reactivity of the leaf surface's "chemical landscape", the dynamic ensemble of compounds covering plant leaves. We classified chemicals as endogenous (originating from the plant and its biome) or exogenous (delivered from the environment), highlighting the biological, geographical, and meteorological factors driving their contributions. Based on available data, we predicted ≫2 μg cm −2 of organics on a typical leaf, leading to a global estimate of ≫3 Tg for multiphase reactions. Our work also highlighted three major knowledge gaps: (i) the overlooked role of ambient water in enabling the leaching of endogenous substances and mediating aqueous chemistry; (ii) the importance of phyllosphere biofilms in shaping leaf surface chemistry and reactivity; (iii) the paucity of studies on the multiphase reactivity of atmospheric oxidants with leaf-adsorbed chemicals. Although biased toward available data, we hope this Review will spark a renewed interest in the leaf surface's chemical landscape and encourage multidisciplinary collaborations to move the field forward. CONTENTS

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The chemical landscape of leaf surfaces and its interaction with the atmosphere

Ossola,

Farmer

2023

Preprint

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Atmospheric chemists have historically treated plant leaves as inert surfaces that merely emit volatile hydrocarbons through their stomata. However, a growing body of evidence suggests that leaves are ubiquitous substrates for multiphase reactions of atmospheric relevance – implying the presence of chemicals on their surfaces. This Review provides an evidence-based overview of the chemistry and reactivity of the leaf surface’s “chemical landscape”, the dynamic ensemble of molecules and particles that cover plant leaves. We classified chemicals as endogenous (originating from the leaf and its biome) or exogenous (delivered from the environment), highlighting the biological, geographical, and meteorological factors driving their relative contributions. Based on available data, we predicted ≫ 2 µg cm-2 of organics on a typical leaf, leading to a global estimate of ≫ 3 Tg available for multiphase reactions. Our work also highlighted three major knowledge gaps: (i) the key (but still overlooked) role of ambient water in enabling the leaching of endogenous substances and mediating aqueous chemistry; (ii) the role of phyllosphere biofilms in shaping leaf surface chemistry and reactivity; (iii) the paucity of studies on the multiphase reactivity of main atmospheric oxidants with leaf-adsorbed chemicals. Although biased towards available data, we hope this Review will spark a renewed interest on the leaf surface’s chemical landscape and motivate the establishment of multidisciplinary collaborations to move the field forward.

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Tree leaves as a habitat for phyllobacteria

Cited by 6 publications

References 108 publications

Diversity of Microbial Communities, PAHs, and Metals in Road and Leaf Dust of Functional Zones of Moscow and Murmansk

Diversity of Microbial Communities, PAHs, and Metals in Road and Leaf Dust of Functional Zones of Moscow and Murmansk

The Chemical Landscape of Leaf Surfaces and Its Interaction with the Atmosphere

The chemical landscape of leaf surfaces and its interaction with the atmosphere

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