scholarly journals Meiotic Behaviour in Ten Species of Pteridophytes From Bangladesh

2021 ◽  
pp. 135-142
Author(s):  
MA Mannan ◽  
G Kabir
Keyword(s):  
Meiotic Behaviour ◽  
Meiotic Behavior ◽  
Morphological Variations ◽  
Wide Range ◽  
Adiantum Capillus Veneris

Meiotic behavior of ten pteridophyte species from Bangladesh was analyzed in the present investigation. In SMCs of Adiantum capillus-veneris, thirty distinct bivalents were enumerated. In A. caudatum 16 SMCs resulting 64 spores were observed in sporangium which appeared to be diploid sexual. A. lunulatum was found to be triploid apogamous and as diploid sexual forms, thus this species of Adiantum exhibited wide range of morphological variations. Pteris biaurita, P. graffithi and P. vittata were recorded to be n = 29 as diploid. In thelypterids, all the four species were observed to be diploid sexual except C. dentata when it was tetraploid (n = 36, 4x = 144). In C. arida, meiosis was almost regular with 2n = 72 chromosomes. C. cylindrothrix and Ampelopteris prolifera were also found to be diploid sexual, with 2n = 72 chromosomes. J. Bio-Sci. 29(1): 135-142, 2021 (June)

scholarly journals Morphometric and Molecular Analyses of Ostertagia leptospicularis Assadov, 1953 from Ruminants: Species Diversity or Host Influence?

Animals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 182
Author(s):  
Anna Wyrobisz-Papiewska ◽  
Jerzy Kowal ◽  
Elżbieta Łopieńska-Biernat ◽  
Paweł Nosal ◽  
Iwona Polak ◽  
...  
Keyword(s):  
Host Species ◽  
Roe Deer ◽  
Bos Taurus ◽  
Capreolus Capreolus ◽  
Nematode Species ◽  
Molecular Techniques ◽  
Systematic Classification ◽  
Morphological Variations ◽  
Wide Range ◽  
Induced Changes

Ostertagia leptospicularis Assadov, 1953 was formally described in roe deer Capreolus capreolus and has been reported in a wide range of ruminants, including other Cervidae, as well as Bovidae. Nematode specimens derived from various host species exhibit morphological similarity; however, some differences can be observed. It is unclear if this is due to the differential reaction of one nematode species in different host species (i.e., host-induced changes) or because of distinct nematode species in these hosts (i.e., species complex). This paper focuses on specimens resembling O. leptospicularis f. leptospicularis and its closely related species (Ostertagia ostertagi f. ostertagi) collected from various hosts. Morphometric and molecular techniques were applied to assess host-induced changes in nematode morphology and to clarify its systematic classification. There was an overall effect of host species on measurements of nematodes resembling O. leptospicularis (both males and females), but the distinctiveness of the specimens from cattle Bos taurus were highlighted. The results obtained may suggest that the specimens of O. leptospicularis from cattle in Germany and cervids in central Europe belong to different strains. Furthermore, nematodes from the cervid strain appear to circulate within particular host species, which can be seen in the stated morphological variations.

scholarly journals A quantitative taxonomic review of Fusichonetes and Tethyochonetes (Chonetidina, Brachiopoda)

2017 ◽  
Vol 91 (6) ◽  
pp. 1296-1305 ◽  
Author(s):  
Hui-ting Wu ◽  
G. R. Shi ◽  
Wei-hong He
Keyword(s):  
Cladistic Analysis ◽  
Species Classification ◽  
Triassic Boundary ◽  
Morphological Variations ◽  
Key Characteristics ◽  
Wide Range ◽  
Kolmogorov Smirnov ◽  
Morphological Variables ◽  
End Members ◽  
Permian Triassic Boundary

AbstractTwo middle Permian (Capitanian) to Early Triassic (Griesbachian) rugosochonetidae brachiopod genera, Fusichonetes Liao in Zhao et al., 1981 and Tethyochonetes Chen et al., 2000, have been regarded as two distinct taxa and used as such for a wide range of discussions including biostratigraphy, paleoecology, paleobiogeography, and the Permian-Triassic boundary mass extinction. However, the supposed morphological distinctions between the two taxa are subtle at best and appear to represent two end members of a continuum of morphological variations. In this study, we applied a range of quantitative and analytical procedures (bivariate plots, Kolmogorov-Smirnov test, categorical principle component analysis, and cladistic analysis) to a dataset of 15 quantified morphological variables, integrating both key external and internal characters, measured from 141 specimens of all well-known Fusichonetes and Tethyochonetes in order to test whether or not these two genera could be distinguished in view of the chosen characters. The results indicate that these two genera are morphologically indistinguishable and that the species classification previously applied to these two genera appears to represent polyphyletic groupings within the genus Fusichonetes. Consequently, Tethyochonetes is concluded to be a junior synonym of Fusichonetes. The diagnosis and key characteristics of Fusichonetes are clarified and refined based on a new suite of well-preserved specimens from the Permian−Triassic Xinmin section in South China.

scholarly journals Butterfly Pea (Clitoria ternatea L.: Fabaceae) and Its Morphological Variations in Bali

2021 ◽  
Vol 6 (2) ◽  
pp. 63013
Author(s):  
I Wayan Suarna ◽  
I Made Saka Wijaya
Keyword(s):  
Ornamental Plants ◽  
Morphological Characterization ◽  
Primary Data ◽  
Natural Food ◽  
Herbaceous Plant ◽  
Clitoria Ternatea ◽  
Morphological Variations ◽  
Perennial Herbaceous Plant ◽  
Wide Range ◽  
Butterfly Pea

Butterfly pea (Clitoria ternatea L.) is an important perennial herbaceous plant with a range of uses as ornamental plants, fodder crops, medicine, and sources of natural food colorant and antioxidants. The leaves and pods are commonly used as a source of protein in fodder, while the flowers are usually dried and processed as a high antioxidant-containing tea. The blue variant of butterfly pea was the most commonly used variety, although there are quite diverse butterfly pea varieties. The present study aimed to observe the morphological variations among the 26 butterfly pea accessions that originated from a wide range of areas in Bali. The explorative method was used to obtain diverse specimens (accessions) of butterfly pea in Bali, and subsequently, morphological characterization of the accessions was performed. The primary data of morphological traits that were recorded included stems, leaves, flower structures, flower colors, pods, and seeds. The data were analyzed descriptively to determine the morphological variations between accessions. The results showed three major morphological variations: (i) the colour of the flower (corolla), (ii) the corolla structure, and (iii) the stamen structure. The colour of corolla has four variations: white, mauve, light blue, and dark blue; while the corolla structure has two variations: normal and multiple layered corollas. The stamen character showed a correlation with the structure of the corolla. The normal corolla has diadelphous stamens, while the multiple layered corollas have solitary stamens. These morphological variations are the genetic richness of Indonesia’s biodiversity and should be protected and conserved.

CYTOGENETIC, ECOLOGIC AND MORPHOLOGIC STUDIES IN BRAZILIAN FORMS OF PASPALUM DILATATUM

1968 ◽  
Vol 10 (1) ◽  
pp. 131-138 ◽  
Author(s):  
M. Irene B. De Moraes Fernandes ◽  
I. L. Barreto ◽  
F. M. Salzano
Keyword(s):  
Meiotic Behavior ◽  
Paspalum Dilatatum ◽  
Wide Range ◽  
Somatic Number ◽  
The Common ◽  
Metaphase I

The somatic number, meiotic behavior, morphology and ecology of five forms of Paspalum dilatatum Poir are reported. The sexual type yellow anther (2n = 40) showed essentially regular meiotic behavior. The common form (2n = 50) presented 20 II and 10 I in about 85% of the cells studied at diakinesis and metaphase I. Pauciciliatum (2n = 40) and Uruguaiana (2n = 60) showed a wide range of chromosome configurations at these stages; finally, Torres presented uniformly 60 univalents. These results are compared with morphologic and ecologic data and some suggestions about the possible mode of origin of these forms are presented.

CYTOLOGICAL STUDIES IN BROMUS SPECIES, SECTION BROMOPSIS

1961 ◽  
Vol 39 (4) ◽  
pp. 757-773 ◽  
Author(s):  
M. R. Hanna
Keyword(s):  
Interspecific Hybridization ◽  
Seed Set ◽  
Significant Negative Correlation ◽  
B Chromosome ◽  
Meiotic Behavior ◽  
Stainable Pollen ◽  
Meiotic Irregularities ◽  
Wide Range ◽  
Positive Correlations ◽  
Bromus Erectus

Chromosome numbers and meiotic behavior were determined in clones of Bromus inermis, Bromus pumpellianus, and the Bromus erectus complex. Clones of B. inermis were octoploid (2n = 56) or near-octoploid, one aneuploid having 2n = 54 chromosomes. B. pumpellianus clones were octoploid, with one bearing a B chromosome. B. erectus-type clones had 56, 59, 65, or 70 chromosomes. Meioses varied widely among plants in extent of irregularity. Meiotic behavior was studied in detail and the sequential interrelationships of irregularities at meiotic stages analyzed. Significant or highly significant positive correlations were obtained for the B. pumpellianus clones between percentages of non-stainable pollen and frequencies of metaphase I univalents, anaphase II laggards, and quartet micronuclei. These relationships were non-significant for the B. inermis and B. erectus-type clones. A significant negative correlation was determined between percentage of non-stainable pollen and percentage of seed set following open pollination, but other relationships between meiotic irregularities or pollen stainability and seed-setting characteristics were non-significant. The wide range in chromosome number and meiotic behavior encountered in material commonly distributed on this continent as "B. erectus” may be due to interspecific hybridization in nurseries in which Bromus introductions are grown. Interspecific hybridization may be partially responsible also for aneuploidy and meiotic irregularity in B. inermis.

Mutagenic Effectiveness and Efficiency of Gamma Rays and HZ with Phenotyping of Induced Mutations in Lentil Cultivars

2017 ◽  
Vol 64 ◽  
pp. 17-31 ◽  
Author(s):  
Rafiul Amin Laskar ◽  
Samiullah Khan
Keyword(s):  
Gamma Rays ◽  
Agronomic Traits ◽  
Mutation Breeding ◽  
Induced Mutations ◽  
Morphological Variations ◽  
Combination Treatments ◽  
Base Parameters ◽  
Wide Range ◽  
Effectiveness And Efficiency ◽  
Growth Habits

In mutation breeding, mutagenic effectiveness and efficiency are the base parameters to predict the mutagenic potency of any mutagen. Studies on mutagenic effectiveness and mutagenic efficiency of physical mutagen (gamma rays) and chemical mutagen (hydrazine hydrates; HZ) on two cultivars of lentil (Lens culinaris Medik.), viz. DPL 62 (macrosperma) and Pant L 406 (microsperma) have been reported. Dry and healthy seeds were treated with four doses of each gamma rays (100-400 Gy), HZ (0.1-0.4 %) and their combinations. Frequencies of the induced agro-morphological variations into different phenotypic categories were estimated in M2 population that resulted into identification and isolation of wide range of mutants with altered phenotypes. Data on effectiveness and efficiency of various mutagenic treatments calculated on the basis of the frequency of chlorophyll mutations, which showed effectiveness and efficiency were higher at the moderate doses of gamma rays and HZ, while in case of combination treatments; lower doses were most effective and efficient with few inter-varietal exceptions. Phenotyping of the mutants revealed that growth habits was the most sensitive category to which most of the mutant belongs, followed by leaf and flower/pod/seed in both the cultivars studied. Overall, the screened and isolated mutants with economically important agronomic traits can be further propagated in the subsequent generation for development of elite lentil mutant cultivars.

scholarly journals A Study on Morphological Variations of Fissures and Lobes of Human Lungs with its Clinical Significance

2019 ◽  
Vol 8 (2) ◽  
pp. 21-25
Author(s):  
Dil Islam Mansur ◽  
Nabin Bista ◽  
Pragya Shrestha ◽  
Sunima Maskey
Keyword(s):  
Clinical Significance ◽  
Clinical Diagnosis ◽  
Surgical Procedures ◽  
Lower Lobe ◽  
Morphological Variations ◽  
Human Lungs ◽  
Wide Range ◽  
The Right ◽  
Oblique Fissure ◽  
Accessory Fissure

Background: Fissures of lungs facilitate the movement of lobes which helps in expansion of lungs during breathing.  The fissures may be complete, incomplete or absence. Sometime the accessory fissures may also present. Awareness of variations is essential during segmental resections as well as during radiological interpretation of lungs. Hence, the present study was aimed to study the morphological variations in fissures and lobes. Material and Methods: This study was consisted of sixty nine human lungs with irrespective of sex which were available in the department of anatomy of various medical colleges. All lung specimens were carefully observed and recorded for the presence of any variations in fissures and lobes. Results: The present study revealed that the absence of horizontal fissure was observed in 7.89%, while no specimen showed absence of oblique fissure on both sides. 35.48% of left lungs had incomplete oblique fissure compared to 28.95% of the right lungs. In addition, 22.58% of right lungs and 23.68% of left lungs showed presence of accessory fissure and lobes. From above, the incomplete and absent horizontal fissure was the most common abnormalities observed in this study. The accessory fissures were more common in lower lobe of right lung whereas in left lungs it was more common in upper lobe. Conclusion: The present study showed the wide range of variations in fissures and lobes of lungs. The knowledge of variations in morphology of lungs would be helpful for clinical diagnosis and pulmonary surgical procedures.

scholarly journals Distribution and Morphological Variations of Invasive Macrophytes Elodea Nuttallii (Planch.) H. St. John and Elodea Canadensis Michx in Croatia

2014 ◽  
Vol 73 (2) ◽  
pp. 437-446 ◽  
Author(s):  
Aleksandra Kočić ◽  
Janja Horvatić ◽  
Sven D. Jelaska
Keyword(s):  
Morphological Variability ◽  
Environmental Parameters ◽  
Leaf Length ◽  
Water Levels ◽  
Internode Length ◽  
Leaf Width ◽  
Elodea Nuttallii ◽  
Channel Network ◽  
Morphological Variations ◽  
Wide Range

Abstract The invasive species Elodea nuttallii was recorded for the first time in the Croatian flora in 2006, in the drainage channels of Kopački rit (Baranja). After its establishment, E. nuttallii begins to spread to the eastern and northern part of the drainage channel network from 2006-2009. High water levels are responsible for the linear spreading direction of E. nuttallii, E. nuttallii and E. canadensis show a wide range of morphological variation, which is characteristic of successful invaders. To show morphological variations of two Elodea species, the most important characters indicated in the literature were measured on 24 fresh collected samples from the seven sites in Croatia. In spite of some overlap in leaf length and width between the two Elodea species, the differences of all morphological traits except internode length are statistically significant. In E. nuttallii leaf width, length and internode length show a higher morphological variability as a result of the higher adaptive strategy to environmental parameters. The most reliable morphologi-cal characters distinguishing E. nuttallii and E. canadensis are leaf width 0.5 mm below the tip and the angle at the apex. E. nuttallii can be expected to spread to other areas of Croatia.

Comportement meiotique de populations tetraploides du genre Dactylis

1986 ◽  
Vol 28 (6) ◽  
pp. 899-905 ◽  
Author(s):  
Gaëtan Guignard
Keyword(s):  
Distribution Pattern ◽  
Statistical Study ◽  
Meiotic Behaviour ◽  
Meiotic Behavior ◽  
Ring Bivalents ◽  
The Individual

A statistical study of four criteria applied to the genus Dactylis (Poaceae) enabled us to determine the individual meiotic behaviour of eight tetraploid populations. Those criteria were as follows: the percentage of rod and ring bivalents, the average number of tetravalents, the average number of chiasmata, and the distribution pattern of chromosomic formulas.Key words: Dactylis, populations, meiotic behavior, tetraploidy, cocksfoot.

Sign in / Sign up

Export Citation Format

Share Document