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Systematic Botany
Phylogenetic Relationships in the Commelinaceae: I. A. Cladistic Analysis of Morphological Data2000 •
It is well known that the structure of leaves plays an important role in adaptation, but there are still no accurate structural criteria to indicate ecological characteristics of the species. We have studied parameters of leaves in 100 herbaceous plant species growing in the southern taiga subzone that belong to different ecological groups in relation to irradiance and moisture supply. The results show that leaf area, thickness, and anatomical type are less correlated with ecological characteristics of the species than structural parameters of photosynthetic tissues. In the series shadeloving mesophytes—lightloving hygromesophytes—mesophytes—xeromesophytes—mesoxerophytes, the concentration of cells and chloroplasts in the leaf gradually increases by a factor of up to 7–10, their size decreases two to threefold, and the ratio of mesophyll surface area to leaf surface area increases four to fivefold. It is concluded that characteristics of mesophyll are of adaptive significance. A system of characters is proposed for identification of ecological groups of plants growing in the boreal zone.
Frontiers in Plant Science
Reconsideration of Plant Morphological Traits: From a Structure-Based Perspective to a Function-Based Evolutionary Perspective2017 •
The initial phase of a plant life cycle is a short and critical period, when individuals are more vulnerable to environmental factors. The morphological and anatomical study of seedlings and saplings leaf type enables the understanding of species strategies of fundamental importance in their establishment and survival. The objective of this study was to analyze the structure of seedlings and saplings leaf types of three mangrove species, Avicennia schaueriana, Laguncularia racemosa, Rhizophora mangle, to understand their early life adap-tive strategies to the environment. A total of 30 fully expanded cotyledons (A. schaueriana and L. racemosa), 30 leaves of seedlings, and 30 leaves of saplings of each species were collected from a mangrove area in Guaratuba Bay, Paraná State, Brazil. Following standard methods, samples were prepared for morphological (leaf dry mass, density, thickness) and anatomical analysis (epidermis and sub-epidermal layers, stomata types, density of salt secretion glands, palisade and spongy parenchyma thickness). To compare leaf types among species one-way ANOVA and Principal Component Analysis were used, while Cluster Analysis evaluated differences between the species. We observed significant structural differences among species leaf types. A. schaueriana showed the thickest cotyledons, while L. racemosa presented a dorsiventral structure. Higher values of the specific leaf area were observed for seedlings leaves of A. schaueriana, cotyledons of L. racemosa and saplings leaves of A. schaueriana and R. mangle. Leaf density was similar to cotyledons and seedlings leaves in A. schaueriana and L. racemosa, while R. mangle had seedlings leaves denser than saplings. A. schaueriana and R. mangle showed hypostomatic leaves, while L. racemosa amphistomatic; besides, A. chaueriana showed diacytic stomata, while L. racemosa anomocytic, and R. mangle ciclocytic. Seedling leaves were thicker in R. mangle (535 µm) and L. racemosa (520 µm) than in A. schaueriana (470.3 µm); while saplings leaves were thicker in L. racemosa (568.3 µm) than in A. schaueriana seedlings (512.4 µm) and R. mangle (514.6 µm). Besides, seedlings leaves palisade parenchyma showed increasing thickness in L. racemosa (119.2 µm) < A. schaueriana (155.5 µm) < R. mangle (175.4 µm); while in saplings leaves as follows R. mangle (128.4 µm) < A. schaueriana (183.4 µm) < L. racemosa (193.9 µm). Similarly, seedlings leaves spongy parenchyma thickness values were as follows A. schaueriana (182.6 µm) = R. mangle (192.8 µm) < L. racemosa (354.4 µm); while in saplings were A. schau-eriana (182.6 µm) = R. mangle (187.3 µm) < L. racemosa (331.3 µm). The analyzed traits, in different combinations , represent morphological adjustments of leaf types to reduce water loss, eliminate salt excess, increase the absorption of light, allowing a higher efficiency on the maintenance of physiological processes in this initial growth stage. Rev. Biol. Trop. 64 (1): 305-317. Epub 2016 March 01.
2000 •
American Journal of Botany
Convergence and correlations among leaf size and function in seed plants: a comparative test using independent contrasts1999 •
2008 •
1998 •
Phenotypic plasticity was investigated in Commelina communis L. (Commelinaceae), which is a perennial herb native to temperate Asia (China) and widely naturalised in the central and eastern Black Sea regions were investiguted C. communis has a relatively high ecological tolerance with respect to climatic and soil factors. It was found that the shoot length, leaf width, number of branches, dead leaves and flowers, root:shoot ratio, total -flower- and root biomasses, flower and root ni- trogen and RE 1 and RE 2 varied significantly in among the three populations. In addition, there were statistically important correlations between reproductive effort (RE) values in the three natural populations of C. communis. Consequently, it was concluded that C. communis has a high phenotypic plasticity.
2003 •
Plant Ecology and Evolution
Leaf morphospace in Euphorbia tithymaloides (Euphorbiaceae) was likely shaped by evolutionary contingencies rather than climateBackground and aims – Understanding whether variation in plant attributes is primarily driven by selection or historical contingencies is a main goal in evolutionary biology. We characterize leaf diversity in Euphorbia tithymaloides and identify patterns related to taxonomy, geography, biogeography, and climate that provide insights on the role of ecological and evolutionary forces in shaping its leaf diversity. Material and methods – We constructed a leaf morphospace using linear morphometric measurements derived from images (leaf maximum length and width, area, and perimeter), and calculated indexes that reflect aspects of leaf shape (leaf aspect ratio, area-perimeter ratio, obovate index, and circularity). Climatic data were extracted from WorldClim layers based on occurrence data. We visualized leaf and climate spaces with principal components analyses and used Kruskal-Wallis tests, linear models, and Mantel tests to test predictors of leaf variation (taxonomy, geography, climat...
2015 •
BIOLEX REVISTA JURIDICA DEL DEPARTAMENTO DE DERECHO
La problemática de la protección del Derecho a la Salud de las personas migrantes en tránsito por MéxicoThe open dentistry journal
A dilated odontoma in the second molar region of the mandible2011 •
HAL (Le Centre pour la Communication Scientifique Directe)
The Saint-Prest site: evidence of a human presence around a million years ago?2022 •
Journal of Wildlife Diseases
Ear Mange Mites (Notoedres muris) in Black and Norway Rats (Rattus rattus and Rattus norvegicus) from Inner-City Vancouver, Canada2014 •
Anales Del Seminario De Historia De La Filosofia
Les sphères divisées d'Aristophane à Ibn Hazm2002 •
2017 •
2019 •
2012 •
Diagnostic Microbiology and Infectious Disease
Erratum to “Selection of colistin-resistant Acinetobacter baumannii isolates in postneurosurgical meningitis in an intensive care unit with high presence of heteroresistance to colistin” [Diagn Microbiol Infect Dis 65 (2009) 188–191]2010 •
Theologica Xaveriana
Theologica Xaveriana y la construcción de una teología colombiana. El concepto “evangelización” (1974-1991)2020 •
Liver International
NADPH oxidase-mediated platelet isoprostane over-production in cirrhotic patients: implication for platelet activation2011 •
Archives of Neurology
Cognitive Evaluation of Neurologically Asymptomatic Boys With X-linked Adrenoleukodystrophy2006 •
Journal of Endovascular Therapy
Early Experience With Endovascular Aneurysm Sealing in Combination With Parallel Grafts for the Treatment of Complex Abdominal Aneurysms: The ASCEND Registry2017 •
Relaciones Estudios De Historia Y Sociedad
El espejismo de la autonomía total. La Universidad Autónoma de México y sus conflictos con la presidencia de la República, 19352007 •
Journal on Processing and Energy in Agriculture
Indicators of economic efficiency of sour cherry in different production systems2021 •