Morphological and leaf anatomical variation in Festuca rubra sensu lato (Poaceae) from eastern Quebec

1987 ◽  
Vol 65 (6) ◽  
pp. 1065-1077 ◽  
Author(s):  
Martin Dubé ◽  
Pierre Morisset
Keyword(s):  
Salt Marshes ◽  
Anatomical Variation ◽  
Similarity Analysis ◽  
Festuca Rubra ◽  
Classification Problems ◽  
Geographical Factors ◽  
Variation Patterns ◽  
Character Variation ◽  
Anatomical Characters ◽  
Weak Structure

The variation of 52 morphological and anatomical characters was analysed in 32 populations of Festuca rubra L. sensu lato from salt marshes, coastal rocks, coastal sands, and anthropogenic sites in eastern Quebec. The results show that the variation of characters is essentially continuous within and between populations, that some populations are much more variable than others, and that on the whole, character variation patterns are mainly related to ecological rather than geographical factors. The weak structure revealed by a similarity analysis of populations is the source of the classification problems within this species.

Evaluation of morphological and anatomical characters for discrimination and verification of some Medicago sativa (L.) Cultivars

2016 ◽  
Vol 50 (2) ◽  
Author(s):  
Mohamed M. Moawed
Keyword(s):  
Medicago Sativa ◽  
Seed Coat ◽  
Anatomical Variation ◽  
Morphological Characters ◽  
Vascular Bundles ◽  
Surface Patterns ◽  
Anatomical Characters ◽  
Periclinal Walls ◽  
Seed Coat Morphology ◽  
Morphological And Anatomical Variation

<italic>Medicago sativa</italic> L. (alfalfa) is one of the most important legume forages in the world. The objective of this study was to characterize and discriminate among 15 alfalfa cultivars with a different geographical origin. Macro-morphological and anatomical characters as well as seed coat sculpture were investigated. Twenty five morphological characters were extracted directly from the fresh specimens. Transverse section in the main stem were carried out; stained and seventeen anatomical characters were examined by light microscope. Seed coat surface was investigated using Scanning Electron Microscope (SEM). Data obtained were coded and analysed using NTsys-Pc software (Version 2.02) and the resulted dendrogram is discussed. The results showed morphological and anatomical variation between the studied taxa. Vascular bundles ranged from 16 to 23. The Egyptian cultivar Nubaria has the lowest number of vessels (16) while the American Super supreme has the larger number (23). The seed coat ornamentation revealed five main surface patterns and suggests the presence of variations in anticlinal boundaries and periclinal walls that provide stable diagnostic characters for morphologically closely related taxa. The dendrogram showed that the Egyptian cultivar Nubaria was the most distant and clustered separately from all the other alfalfa cultivars which were grouped into two main clusters. Seed coat morphology and combination of other plant morphological and anatomical characters permitted identification and discrimination between the examined cultivars. Results obtained in this work could be considered for further breeding strategies and studies.

La plasticité phénotypique des caractères anatomiques foliaires chez le Festuca rubra L. (Pcaceae)

1996 ◽  
Vol 74 (11) ◽  
pp. 1708-1718 ◽  
Author(s):  
Martin Dubé ◽  
Pierre Morisset
Keyword(s):  
Phenotypic Plasticity ◽  
Analysis Of Variance ◽  
Leaf Anatomy ◽  
Salt Marshes ◽  
Festuca Rubra ◽  
Transplantation Experiment ◽  
Plasticité Phénotypique ◽  
Almost All

The phenotypic plasticity of nine anatomical leaf characters of Festuca rubra was studied through a transplantation experiment. Twelve genotypes from four habitats (salt marshes, coastal rocks, coastal sands, and ruderal places) were submitted to five treatments in a garden. An analysis of variance shows that almost all these characters were modified by treatments. Nevertheless, in most cases, the greatest part of the variation observed was genetic rather than plastic. Morever, it appears that genotypes responded quite differently to the treatments. The use of these characters in the taxonomy of F. rubra is discussed. Keywords: Festuca rubra, leaf anatomy, phenotypic plasticity.

scholarly journals Anatomy of two Rhododendron species along the elevational gradient, Eastern Nepal

2018 ◽  
Vol 28 (2) ◽  
pp. 32-44
Author(s):  
M. L. Pathak ◽  
B. B. Shrestha ◽  
L. Joshi ◽  
X. F. Gao ◽  
P. K. Jha
Keyword(s):  
Nitrogen Content ◽  
Plant Height ◽  
Anatomical Variation ◽  
Elevation Gradient ◽  
Common Species ◽  
High Elevation ◽  
Cell Number ◽  
Vessel Element ◽  
Wide Range ◽  
Anatomical Characters

A wide range of habitat conditions including elevation determine adaptative variation in a species. The study was carried out to investigate the anatomical variation of two common species of Rhododendron (R. anthopogon and R. lepidotum) growing between 3200 and 4700 m asl in Gokyo valley of Sagarmatha National Park, Khumbu, eastern Nepal. Seven anatomical characters viz. pore area (PA), pore density (PD), vessel element length (VEL), fiber tracheid length (FL), ray density (RD), uniseriate ray height (URH) and uniseriate ray cell number (URCN) of twenty-three samples for two species (12 samples of R. anthopogon and 11 of R. lepidotum) were studied by making permanent slides of transverse, tangential longitudinal and radial longitudinal stem sections. In R. anthopogon, out of three non- anatomical characters (plant height, soil nitrogen and leaf nitrogen) the nitrogen content in leaf increased with increasing elevation. However, the plant height and nitrogen content in soil did not vary significantly with elevation. Out of the seven wood anatomical characters three characters such as PA, VEL and FL decreased with increasing elevation. The other four characters, PD, RD, URH and URCN did not vary significantly with elevation. In R. lepidotum, plant height decreased with increasing elevation and nitrogen content of soil and leaf increased with elevation. The PD, PA, VEL and FL decreased along the elevation gradient. However, RD, URH and URCN did not vary significantly with elevation. These variations in the anatomical features of both species have been attributed to the adaptative strategies of the plant in the hostile environment at high elevation.

scholarly journals Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae)

2019 ◽  
Vol 88 (4) ◽  
pp. 351-451 ◽  
Author(s):  
Isabel T. Hyman ◽  
Frank Köhler
Keyword(s):  
New Species ◽  
Anatomical Variation ◽  
The Other ◽  
Systematic Revision ◽  
Systematic Classification ◽  
Diagnostic Characters ◽  
Anatomical Characters ◽  
Well Differentiated ◽  
Species Descriptions ◽  
Mitochondrial Phylogeny

The helicarionid fauna of southeastern to mid-eastern Queensland is dominated by a group of semislugs with moderately reduced shells belonging to genera Fastosarion, Eungarion, Stanisicarion, Dimidarion, Macularion and Hymanarion. We comprehensively revise their systematic classification using comparative morpho-anatomy and mitochondrial phylogenetics, and demonstrate that these genera combined form a well-differentiated and monophyletic radiation. In our mitochondrial phylogeny, this radiation is divided into three main clades that are statistically well supported. One clade is also well defined in terms of diagnostic morpho-anatomical characters, but we could not identify diagnostic characters for the other two clades due to considerable levels of morpho-anatomical variation. We propose accepting only two genera, Fastosarion (with junior synonyms Eungarion, Dimidarion, and Hymanarion) and Stanisicarion (with junior synonym Macularion). Both genera represent mutually monophleytic sister taxa that can consistently be distinguished by the presence or absence of a penial verge that is fused to the penial wall and by egg shape. We also synonymise Fastosarion ameyi with F. aquavitae, F. schelli with F. helenkingae, Dimidarion peterbrocki and D. slatyeri with F. alyssa, Stanisicarion virens with S. freycineti. Revised species descriptions are presented for Fastosarion alyssa, F. aquavitae, F. brazieri, F. comerfordae, F. griseolus, F. hannianus, F. helenkingae, F. mcdonaldi, F. minerva, F. paluma, F. papillosus, F. pustulosus, F. superbus, Stanisicarion aquila and S. freycineti. Nine new species, Fastosarion deensis, F. ephelis, F. insularis, F. katatonos, F. longimentula, F. rowani, F. sarina, F. tuljun and Stanisicarion wolvi are described, bringing the total number of accepted species to 24.

L'emploi des caractères épidermiques dans l'étude taxonomique du Festuca rubra lato sensu (Poaceae)

1996 ◽  
Vol 74 (3) ◽  
pp. 469-485 ◽  
Author(s):  
Martin Dubé ◽  
Pierre Morisset
Keyword(s):  
Morphological Variation ◽  
Festuca Rubra ◽  
Leaf Epidermis ◽  
Eastern Canada ◽  
Anatomical Characters

The leaf epidermis from a collection of 33 specimens encompassing most of the morphological variation of Festuca rubra in Eastern Canada and including two cytotypes (2n = 42 and 2n = 56) is described with 16 characters. The leaf epidermal composition differs markedly between culms and vegetative shoots. Many epidermal characters, particularly those from the vegetative shoots, are among the best ones for distinguishing between the two cytotypes. Parallel analyses using nine anatomical characters show the greater taxonomical potential of epidermis. Keywords: Festuca rubra, leaf, epidermis, anatomy, cytotypes.

scholarly journals Variación anatómica de la madera de Avicennia germinans en la Laguna de la Mancha, Veracruz, México

2019 ◽  
Vol 85 ◽  
pp. 7
Author(s):  
Laura Yáñez Espinosa ◽  
Guillermo Angeles ◽  
Jorge López Portillo ◽  
Saamantha Barrales
Keyword(s):  
Mechanical Stability ◽  
Salinity Gradient ◽  
Avicennia Germinans ◽  
Mangrove Species ◽  
Low Salinity ◽  
La Mancha ◽  
Effi Ciency ◽  
Character Variation ◽  
Anatomical Characters ◽  
Tolerance To Salinity

<em>Avicennia germinans</em> is a mangrove species with a high tolerance to salinity, but only has shown tendencies towards increase size in wood character at low salinity sites. In La Mancha lagoon, Veracruz, A. germinans is distributed in a wide salinity gradient, making interesting to analyze their anatomical character variation with respect to salinity. The results suggest that differences among sites for a) vessel tangential wall thickness, b) vessel frequency, and c) fi ber tangential lumen diameter, could be attributed to an environmental effect. Increase in these three anatomical characters associated with high salinity and increased fl ooding exposure implies a trade-off between hydraulic effi ciency and mechanical stability of wood. This suggests that global warming would affect <em>A. germinans</em> when sea level raise increase salinity, affecting hydraulic conductivity, reducing growth in height and leaf area.

The Leaf Anatomy of Leptospermum Forst. (Myrtaceae)

1980 ◽  
Vol 28 (1) ◽  
pp. 77 ◽  
Author(s):  
CT Johnson
Keyword(s):  
Leaf Anatomy ◽  
Water Availability ◽  
Anatomical Variation ◽  
Species Level ◽  
Individual Species ◽  
Stomatal Development ◽  
Ecological Data ◽  
Anatomical Characters ◽  
Character Complexes ◽  
The Individual

The leaf anatomy of 40 species of Leptospermum Forst. (Myrtaceae) is described in detail. The genus shows a fairly constant, typically myrtaceous leaf structure with isobilateral mesophyll and the presence of schizogenous oil cavities as constant characters. Variation occurs in stomatal type, sculpturing of the cuticle, persistence of the indumentum, and structure of the oil cavities. Both perigenous and mesoperigenous types of stomatal development have been observed. A number of characters show a considerable variation below the species level. The pattern of anatomical variation does not support Bentham's subdivision of the genus into three sections. Alternative subdivisions cannot be proposed on account of considerable overlap of the character complexes of the individual species. In some cases it is, however, possible to suggest mutual affinity (e. g. between L. laevigatum and L. coriaceum) on the basis of leaf anatomy. A comparison of the available ecological data with anatomical characters supports some of the generalized trends for increased xeromorphy with water availability. On the whole, however, all species of Leptospermum, including the mesic ones, show a rather xeromorphic leaf anatomy.

Wood Anatomy of the Predominantly African Representatives of the Tribe Psychotrieae (Rubiaceae-Rubioideae)

IAWA Journal ◽  
1997 ◽  
Vol 18 (2) ◽  
pp. 169-196 ◽  
Author(s):  
Steven Jansen ◽  
Elmar Robbrecht ◽  
Hans Beeckman ◽  
Erik Smets
Keyword(s):  
Wood Anatomy ◽  
Anatomical Variation ◽  
Vessel Diameter ◽  
The Other ◽  
Fruit Morphology ◽  
Axial Parenchyma ◽  
Perforation Plate ◽  
Generic Delimitation ◽  
Variation Patterns ◽  
Perforation Plates

Wood samples of representatives of Chassalia, Chazaliella, Gaertnera, Hymenocoleus, Pagamea and Psychotria are examined. The generic delimitation of these predominantly African Psychotrieae, which is mainly based on fruit morphology, is compared with wood anatomical variation patterns. Part of the variation observed is related to habit, e. g. wide vessels in the tree species Psychotria dermatophylla. Other features do have systematic significance, as shown by a cluster analysis of the data obtained. The genus pair Gaertnera/Pagamea differs obviously from the other genera and is wood anatomically clearly distinguished by the presence of fibre-tracheids and parenchyma bands. Chassalia, Chazaliella, Hymenocoleus and Psychotria have rather similar wood structure, although variation in vessel diameter, vessel arrangement, ray composition and axial parenchyma occurs. Several uncommon features are recorded: the presence of few to numerous openings in one oblique perforation plate, irregular reticulate perforation plates and multiple vessel-ray perforations with marked irregularity.

scholarly journals Leaf anatomical variation in Cephalaria laevigata (dipsacaceae) under different ecological conditions

2014 ◽  
Vol 66 (1) ◽  
pp. 161-171 ◽  
Author(s):  
Ksenija Jakovljevic ◽  
Nevena Kuzmanovic ◽  
Snezana Vukojicic ◽  
D. Lakusic
Keyword(s):  
Vertical Profile ◽  
Anatomical Variation ◽  
Principal Component ◽  
Climatic Conditions ◽  
Canonical Discriminant Analysis ◽  
Habitat Characteristics ◽  
Morphometric Study ◽  
Adaptive Responses ◽  
Anatomical Characters ◽  
Geological Substrate

The results of a multivariate morphometric study of leaf anatomical characters in different, geographically distant populations of the taxon Cephalaria laevigata from Serbia and Romania are presented with the aim to reveal the trends of population differentiation. Analyses were performed on a cross-section of 105 leaves collected from 10 populations. In order to establish the overall morphological variation and relationships between individuals from all populations, principal component analyses and canonical discriminant analysis were performed. Clustering analyses were carried out to explore whether the observed anatomical differences are a result of adaptive responses. Regression analysis was performed to identify the level of correlation between leaf anatomical characters and basic orographic, geological and bioclimatic habitat characteristics. Unexpectedly, in most of the characters there was discrepancy between leaf anatomy and climatic conditions, and the characters did not show significant regularities in the variability of their dimension neither in the vertical profile nor in relation to geological substrate.

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