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PubMed Journals Articles About "Leaf Group Ltd." RSS

03:07 EDT 14th August 2018 | BioPortfolio

Leaf Group Ltd. PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Leaf Group Ltd. articles that have been published worldwide.

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Showing "Leaf Group" PubMed Articles 1–25 of 12,000+

The links between leaf hydraulic vulnerability to drought and key aspects of leaf venation and xylem anatomy among 26 Australian woody angiosperms from contrasting climates.

The structural properties of leaf venation and xylem anatomy strongly influence leaf hydraulics, including the ability of leaves to maintain hydraulic function during drought. Here we examined the strength of the links between different leaf venation traits and leaf hydraulic vulnerability to drought (expressed as P50leaf by rehydration kinetics) in a diverse group of 26 woody angiosperm species, representing a wide range of leaf vulnerabilities, from four low-nutrient sites with contrasting rainfall across...


Composition and Chemical Variability of Enantia polycarpa Engler & Diels Leaf Essential Oil from Côte d'Ivoire.

The composition of Enantia polycarpa Engler & Diels leaf essential oil has been investigated for the first time using a combination of chromatographic and spectroscopic techniques. The compositions of 52 leaf essential oil samples have been subjected to statistical analysis, hierarchical cluster analysis (HCA) and principal component analysis (PCA). Four groups were differentiated, whose compositions were dominated by β-elemene and germacrene B (Group III, 22/52 samples); germacrene D (Group I, 16/52 sampl...

Identification of the group IIa WRKY subfamily and the functional analysis of GhWRKY17 in upland cotton (Gossypium hirsutum L.).

WRKY transcription factors play important roles in plant defense, stress response, leaf senescence, and plant growth and development. Previous studies have revealed the important roles of the group IIa GhWRKY genes in cotton. To comprehensively analyze the group IIa GhWRKY genes in upland cotton, we identified 15 candidate group IIa GhWRKY genes in the Gossypium hirsutum genome. The phylogenetic tree, intron-exon structure, motif prediction and Ka/Ks analyses indicated that most group IIa GhWRKY genes share...


Clarifying the influence of temperature on variances in plant metallic nutrients through minimizing the effect of precipitation.

Understanding the responses of plant nutrients to climate warming is important in the research of global change. However, the responses of plant metallic nutrients to climate warming have been rarely addressed. Furthermore, in previous field investigations, the influence of temperature on plant metallic nutrients has been not effectively separated from that of precipitation; hence, there exists some uncertainties in the relationships between plant metallic nutrients and temperature. To minimize the effect o...

Modelling leaf spectral properties in a soybean functional-structural plant model by integrating the prospect radiative transfer model.

Currently, functional-structural plant models (FSPMs) mostly resort to static descriptions of leaf spectral characteristics, which disregard the influence of leaf physiological changes over time. In many crop species, including soybean, these time-dependent physiological changes are of particular importance as leaf chlorophyll content changes with leaf age and vegetative nitrogen is remobilized to the developing fruit during pod filling.

Differences in leaf thermoregulation and water-use strategies between three co-occurring Atlantic forest tree species.

Given anticipated climate changes, it is crucial to understand controls on leaf temperatures including variation between species in diverse ecosystems. In the first study of leaf energy balance in tropical montane forests, we observed current leaf temperature patterns on three tree species in the Atlantic forest, Brazil, over a 10-day period, and assessed whether and why patterns may vary among species. We found large leaf-to-air temperature differences (maximum 18.3°C) and high leaf temperatures (over 35...

Relationships between leaf functional traits of Machilus pauhoi understory seedlings from different provenances and geographical environmental factors.

To understand the adaptation mechanism of Machilus pauhoi seedlings to environmental changes, leaf functional traits of M. pauhoi seedlings from nine provenances, as well as relationships between leaf traits and environmental factors were analyzed. The results showed that leaf functional traits of M. pauhoi seedlings from different provenances showed significant intraspecific variations, with the coefficient of variation ranging from 8.8% to 28.2%. Specific leaf area, leaf relative water content, leaf tissu...

The value of wet leaves.

Contents I. II. III. IV. V. References SUMMARY: An often-overlooked feature of all plants is that their leaf surfaces are wet for significant periods over their lifetimes. Leaf wetting has a number of direct and indirect effects on plant function from the scale of the leaf to that of the ecosystem. The costs of leaf wetting for plant function, such as the growth of pathogens and the leaching of nutrients, have long been recognized. However, an emerging body of research has also begun to demonstrate some ver...

Anti-inflammatory effect of cinnamaldehyde and linalool from the leaf essential oil of Cinnamomum osmophloeum Kanehira in endotoxin-induced mice.

Cinnamomum osmophloeum Kanehira is a Taiwan native plant that belongs to genus Cinnamomum and is also known as pseudocinnamomum or indigenous cinnamon. Its leaf is traditionally used by local people in cooking and as folk therapy. We previously demonstrated the chemical composition and anti-inflammatory effect of leaf essential oil of Cinnamomum osmophloeum Kanehira of linalool chemotype in streptozotocin-induced diabetic rats and on endotoxin-injected mice. The aim of the present study is to evaluate wheth...

Storage nitrogen coordinates leaf expansion and photosynthetic capacity in winter oilseed rape (Brassica napus L.).

Storage nitrogen (N) is a buffer pool for maintaining leaf growth and synthesizing photosynthetic proteins, but the dynamic of its forms within the life cycle of a single leaf and how it is influenced by N supply remain incompletely understood. A field experiment was conducted to estimate the influence of N supply on leaf growth, photosynthetic characteristics and N partitioning within the sixth leaves of winter oilseed rape (Brassica napus L.) from emergence through senescence. Storage N content (Nstore) d...

Effects of light quality on leaf senescence and endogenous hormones content in grapevine under protected cultivation.

Two grape varieties 'Italia' and 'Centenial seedless' cultured in protected and delayed cultivation were used as experimental materials to study the effects of red and blue light quality on chlorophyll content, net photosynthetic rate, and endogenous hormone content during leaf senescence. The results showed that the chlorophyll content and net photosynthetic rate of the grapes were significantly enhanced in the red light treatment. Although the content of endogenous GA was decreased, an increase in abscisi...

Comparative Study of Withanolide Biosynthesis-Related miRNAs in Root and Leaf Tissues of Withania somnifera.

Withania somnifera, popularly known as Indian ginseng, is one of the most important medicinal plants. The plant is well studied in terms of its pharmaceutical activities and genes involved in biosynthetic pathways. However, not much is known about the regulatory mechanism of genes responsible for the production of secondary metabolites. The idea was to identify miRNA transcriptome responsible for the regulation of withanolide biosynthesis, specifically of root and leaf tissues individually. The transcriptom...

Leaf Dorsoventrality as a Paramount Factor Determining Spectral Performance in Field-Grown Wheat under Contrasting Water Regimes.

The effects of leaf dorsoventrality and its interaction with environmentally induced changes in the leaf spectral response are still poorly understood, particularly for isobilateral leaves. We investigated the spectral performance of twenty-four genotypes of field-grown durum wheat at two locations under both rainfed and irrigated conditions. Flag leaf reflectance spectra in the VIS-NIR-SWIR regions were recorded in the adaxial and abaxial leaf sides and at the canopy level while traits informing on water s...

ORESARA15, a PLATZ transcription factor, mediates leaf growth and senescence in Arabidopsis.

Plant leaves undergo a series of developmental changes from leaf primordium initiation through growth and maturation to senescence throughout their life span. Although the mechanisms underlying leaf senescence have been intensively elucidated, our knowledge of the interrelationship between early leaf development and senescence is still fragmentary. We isolated the oresara15-1Dominant (ore15-1D) mutant, which had an extended leaf longevity and an enlarged leaf size, from activation-tagged lines of Arabidopsi...

Molecular Mechanisms of Leaf Morphogenesis.

Plants maintain the ability to form lateral appendages throughout their life cycle and form leaves as the principal lateral appendages of the stem. Leaves initiate at the peripheral zone of the shoot apical meristem, then develop into flattened structures. In most plants, the leaf functions as a solar panel, where photosynthesis converts carbon dioxide and water into carbohydrates and oxygen. To produce structures that can optimally fulfil this function, plants precisely regulate the initiation, shape, and ...

UPLC-QTOF-MS metabolomics analysis revealed the contributions of metabolites to the pathogenesis of Rhizoctonia solani strain AG-1-IA.

To explore the pathogenesis of Rhizoctonia solani and its phytotoxin phenylacetic acid (PAA) on maize leaves and sheaths, treated leaf and sheath tissues were analyzed and interpreted by ultra-performance liquid chromatography-mass spectrometry combined with chemometrics. The PAA treatment had similar effects to those of R. solani on maize leaves regarding the metabolism of traumatin, phytosphingosine, vitexin 2'' O-beta-D-glucoside, rutin and DIBOA-glucoside, which were up-regulated, while the synthesis of...

Circadian Evening Complex represses Jasmonate-induced leaf senescence in Arabidopsis.

Plants initiate leaf senescence to reallocate energy and nutrients from the aging to developing tissues for optimizing growth fitness and reproduction at the end of growing season or under stress. Jasmonate (JA), a lipid-derived phytohormone, is known as an important endogenous singal in inducing leaf senescence. However, whether and how circadian clock gates JA signaling to induce leaf senescence in plants remains elusive. In this study, we show that the Evening Complex (EC), a core component of circadian ...

Do Aphids Alter Leaf Surface Temperature Patterns During Early Infestation?

Arthropods at the surface of plants live in particular microclimatic conditions that can differ from atmospheric conditions. The temperature of plant leaves can deviate from air temperature, and leaf temperature influences the eco-physiology of small insects. The activity of insects feeding on leaf tissues, may, however, induce changes in leaf surface temperatures, but this effect was only rarely demonstrated. Using thermography analysis of leaf surfaces under controlled environmental conditions, we quantif...

Posttreatment Effects of Olea Europaea L. Leaf Extract on Carbon Tetrachloride-Induced Liver Injury and Oxidative Stress in Rats.

The aim of this study is to examine the therapeutic effects of Olea europaea L. leaf extract on carbon tetrachloride (CCl)-induced liver damage in rats. In the experiments, 3- to 4-month-old 28 male Sprague-Dawley rats were divided into four groups: control, O. europaea leaf extract, CCl, and curative. The CCl and curative groups received CCl (0.2 mL/kg) intraperitoneally for 10 days to form hepatic injury. O. europaea (80 mg/kg) leaf extract was given orally to the curative group dissolved in distilled...

LFR is Functionally Associated with AS2 to Mediate Leaf Development in Arabidopsis.

Leaves are essential organs for plants. We previously identified a functional gene possibly encoding a component of the SWI/SNF complex named LFR (Leaf and Flower Related) in Arabidopsis thaliana. Loss-of-function mutants of LFR displayed obvious defects in leaf morphogenesis, indicating its vital role in leaf development. Here an allelic null mutant of ASYMMETRIC LEAVES2 (AS2), as2-6, was isolated as an enhancer of lfr-1 in petiole length, vasculature pattern and leaf margin development. The lfr as2 double...

Leaf anatomical traits determine the O enrichment of leaf water in coastal halophytes.

Anatomical adaptations to high-salinity environments in mangrove leaves may be recorded in leaf water isotopes. Recent studies observed lower O enrichment (∆ ) of leaf water with respect to source water in three mangrove species relative to adjacent freshwater trees, but the factors that govern this phenomenon remain unclear. To resolve this issue, we investigated leaf traits and ∆ in 15 species of true mangrove plants, 14 species of adjacent freshwater trees and 4 species of semi-mangrove plants at fi...

A Novel LiDAR-Based Instrument for High-Throughput, 3D Measurement of Morphological Traits in Maize and Sorghum.

Recently, imaged-based approaches have developed rapidly for high-throughput plant phenotyping (HTPP). Imaging reduces a 3D plant into 2D images, which makes the retrieval of plant morphological traits challenging. We developed a novel LiDAR-based phenotyping instrument to generate 3D point clouds of single plants. The instrument combined a LiDAR scanner with a precision rotation stage on which an individual plant was placed. A LabVIEW program was developed to control the scanning and rotation motion, synch...

Simultaneous determination of residues of thiamethoxam and its metabolite clothianidin in tobacco leaf and soil using liquid chromatography-tandem mass spectrometry.

A simple analytical method was developed to simultaneously determine thiamethoxam and its metabolite, clothianidin, in fresh tobacco leaf, soil, and cured tobacco leaf using liquid chromatography with tandem mass spectrometry. Thiamethoxam and clothianidin in tobacco and soil samples were extracted with acetonitrile containing 0.1% formic acid and purified using an NH-SPE column. The optimized method provided good linearity with coefficients of determination R≥ 0.9981. The limits of detection and quantifi...

Climate-induced shifts in leaf unfolding and frost risk of European trees and shrubs.

Climate warming has advanced leaf unfolding of trees and shrubs, thus extending the growing period but potentially exposing plants to increased frost risk. The relative shifts in the timing of leaf unfolding vs. the timing and intensity of frost events determine whether frost risk changes under climate warming. Here we test whether the frost risk for unfolding leaves of 13 European tree and shrub species has changed over more than 60 years using dynamic state-space models and phenological observations from ...

Leaf growth rate and nitrogen content determine respiratory costs during leaf expansion in grapevines.

Respiration processes are well recognized as fundamental for the plant carbon balance, but little attention has been paid to the relationships among respiration rates, environment and genetic variability. This can be of particular interest to understand differences in net carbon balances in crops as grapevines. Night respiration (R ) and its associated growth (R ) and maintenance (R ) components were evaluated during leaf expansion in two grapevine cultivars (Tempranillo cv. and Garnacha cv.) that differ in...


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