Isozyme Variation in Eucalyptus nitens and E. denticulata

1998 ◽  
Vol 46 (1) ◽  
pp. 35 ◽  
Author(s):  
Ian O. Cook ◽  
Pauline Y. Ladiges
Keyword(s):  
Genetic Variation ◽  
Morphological Characteristics ◽  
Geographic Range ◽  
The Other ◽  
Isozyme Variation ◽  
Eucalyptus Nitens ◽  
Isolated Populations ◽  
Single Population ◽  
Central Victoria ◽  
Enzyme Systems

Seed samples from 22 populations across the geographic range ofE. nitens (Deane & Maiden) Maiden s. str. andE. denticulata I.O. Cook & P.Y. Ladiges wereanalysed for isozyme variation and estimation of the genetic distance betweenthe two taxa. Analysis of 12 enzyme systems in 3 buffer systems revealed 12polymorphic and 5 monomorphic loci. The results confirm the distinctiveness ofE. nitens and E. denticulatapreviously reported for morphological characteristics. A single population ofthe related species E. quadrangulata Deane & Maidenwas distinct from, and more heterogeneous than, populations of the other two taxa. The results also show regional genetic variation withinE. nitens that correlates with observed differences inmorphology. Three races were identified: northern and central NSW; southern NSW and Mt Kay in eastern Victoria; Baw Baw Ranges and Central Highlands inVictoria. Geographically isolated populations, particularly from central andnorthern NSW, showed the least genetic variation. Variation was highest in anequivocal population from Mt Gregory, central Victoria, where the distributionof E. nitens overlaps with that ofE. denticulata.

scholarly journals Genetic variation among Glomerella cingulata isolates from different Lauraceae hosts

2008 ◽  
Vol 61 ◽  
pp. 394-394
Author(s):  
R.W.A. Scheper ◽  
O.E. Timudo-Torrevilla ◽  
J. Rees-George ◽  
K.R. Everett
Keyword(s):  
Genetic Variation ◽  
New Zealand ◽  
Sequence Analysis ◽  
Geographic Origin ◽  
Its Region ◽  
The Other ◽  
Glomerella Cingulata ◽  
Isolated Populations ◽  
Fungal Populations ◽  
Information Statistic

Four populations of Glomerella cingulata 20 isolates each were sampled from avocado (Perseae americana) fruit from orchards throughout New Zealand and from Queensland Australia and from leaves of Beilschmeidia tawa and Beilschmeidia taraire in Hawkes Bay and the Waitakere Ranges respectively Among 80 isolates 44 different colony morphologies were identified with only three of these occurring in more than one of the four populations The population from B taraire showed less variation in colony morphology than did the other populations with a Shannon and Weaver information statistic H of 047 compared with 071 to 093 More of the diversity occurred within the populations (64) than between them (36) Sequence analysis of the ITS region using maximumparsimony identified two clades among the isolates with all isolates from the native New Zealand trees clustering in one clade and all avocado isolates in the other Some variation was detected within the clades although all isolates from B taraire had identical sequences This study indicates that G cingulata populations from avocado and native trees may represent genetically isolated populations that have evolved separately To identify geographic origin of fungal populations from avocado a different DNA sequence with more variation is required

Lack of allozymic variation in disjunct Newfoundland populations of red pine (Pinusresinosa)

1991 ◽  
Vol 21 (4) ◽  
pp. 525-528 ◽  
Author(s):  
A. Mosseler ◽  
D. J. Innes ◽  
B. A. Roberts
Keyword(s):  
Genetic Variation ◽  
Genetic Differentiation ◽  
Cellulose Acetate ◽  
Gel Electrophoresis ◽  
Red Pine ◽  
Enzyme Electrophoresis ◽  
Isolated Populations ◽  
Putative Gene ◽  
Enzyme Gene ◽  
Enzyme Systems

Disjunct, geographically isolated populations of red pine (Pinusresinosa Ait.) on the island of Newfoundland were investigated by enzyme electrophoresis to determine if these populations were genetically distinct from a range-wide sample of mainland populations. Genetic variation at 23 putative gene loci from 12 enzyme systems was assayed by cellulose acetate gel electrophoresis. Each of the 96 trees sampled was monomorphic for all enzyme gene loci assayed, and no genetic differentiation between Newfoundland and mainland populations was detected. The striking lack of genetic variation at enzyme gene loci in red pine has been confirmed for the most isolated populations at the extreme northeastern margins of its range.

The Population Biology of a Smut Fungus, Ustilago spinificis Ludw. II. Isozyme Polymorphism and Geographic Differentiation

1988 ◽  
Vol 36 (3) ◽  
pp. 347 ◽  
Author(s):  
R Andrews ◽  
GC Kirby ◽  
M Adams
Keyword(s):  
New Zealand ◽  
Western Australia ◽  
Population Biology ◽  
Species Range ◽  
The Other ◽  
Isozyme Variation ◽  
Geographic Differentiation ◽  
Significant Extent ◽  
Isolated Populations ◽  
Isozyme Polymorphism

Isozyme variation was surveyed at 17 loci in 39 strains of Ustilago spinificis collected from all regions of the species range from Western Australia to New Zealand. Only two polymorphisms were observed, one restricted to eastern Victoria and the other more widespread. Heterozygosity (0.03) was low in the species. There was no evidence that geographically isolated populations of this species were genetically differentiated to any significant extent.

Genetic variation in central and disjunct populations of Lilium parryi

1994 ◽  
Vol 72 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Yan B. Linhart ◽  
Andrea C. Premoli
Keyword(s):  
Population Structure ◽  
Genetic Variation ◽  
Genetic Variability ◽  
The Other ◽  
Significant Genetic Differentiation ◽  
Isolated Populations ◽  
Disjunct Populations ◽  
Large Populations ◽  
Low Levels ◽  
Hawkmoth Pollination

We compared levels of genetic variability in small, isolated populations of Lilium parryi in Arizona with those found in large populations in California. Arizona populations were presumably derived from California populations; they were significantly less variable and showed evidence of much higher levels of inbreeding. One California locality whose population structure is similar to those found in Arizona also had relatively low levels of genetic variability. However, the other California populations were highly variable and showed lower levels of inbreeding than Arizona populations. There was significant genetic differentiation among all populations. In Arizona, there was no relationship between current population size and genetic variability. Arizona populations may be vulnerable to extinction, given the magnitude of environmental modifications in their habitats, their small sizes, and their low levels of variability. Key words: genetic structure, rare species, hawkmoth pollination, Lilium, disjunct populations.

RHYNCHOLITES AND THE PROBLEM OF NARROW AND BROAD CONCEPTION OF TAXONS

2018 ◽  
pp. 12-17 ◽  
Author(s):  
I. R. Khuzina ◽  
V. N. Komarov
Keyword(s):  
Sexual Dimorphism ◽  
Morphological Characteristics ◽  
Mass Scale ◽  
Individual Variability ◽  
Point Of View ◽  
The Other ◽  
New Taxon ◽  
Artificial System ◽  
Broad Understanding

The paper considers a point of view, based on the conception of the broad understanding of taxons. According to this point of view, rhyncholites of the subgenus Dentatobeccus and Microbeccus are accepted to be synonymous with the genus Rhynchoteuthis, and subgenus Romanovichella is considered to be synonymous with the genus Palaeoteuthis. The criteria, exercising influence on the different approaches to the classification of rhyncholites, have been analyzed (such as age and individual variability, sexual dimorphism, pathological and teratological features, degree of disintegration of material), underestimation of which can lead to inaccuracy. Divestment of the subgenuses Dentatobeccus, Microbeccus and Romanovichella, possessing very bright morphological characteristics, to have an independent status and denomination to their synonyms, has been noted to be unjustified. An artificial system (any suggested variant) with all its minuses is a single probable system for rhyncholites. The main criteria, minimizing its negative sides and proving the separation of the new taxon, is an available mass-scale material. The narrow understanding of the genus, used in sensible limits, has been underlined to simplify the problem of the passing the view about the genus to the other investigators and recognition of rhyncholites for the practical tasks.

Comparison of human and murine isolates of Schistosoma mansoni from Richard-Toll, Senegal, by isoelectric focusing

1997 ◽  
Vol 71 (2) ◽  
pp. 175-181 ◽  
Author(s):  
M. Sène ◽  
P. Brémond ◽  
J.P. Hervé ◽  
V.R. Southgate ◽  
B. Sellin ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Acid Phosphatase ◽  
Lactate Dehydrogenase ◽  
Schistosoma Mansoni ◽  
Isoelectric Focusing ◽  
Glucose Phosphate Isomerase ◽  
Glucose Phosphate ◽  
Enzyme Systems ◽  
Glucose 6 Phosphate Dehydrogenase ◽  
Arvicanthis Niloticus

AbstractStudies on human and murine isolates of Schistosoma mansoni, from Richard-Toll, Senegal, were carried out by isoelectric focusing in polyacrylamide gels. Seven enzyme systems; lactate dehydrogenase (LDH), malate dehydrogenase (MDH), glucose-6-phosphate dehydrogenase (G6PD), acid phosphatase (AcP), hexokinase (HK), glucose phosphate isomerase (GPI), and phosphoglucomutase (PGM), were used to compare the two isolates. All systems tested, apart from LDH, were found to be polymorphic for both isolates. Interestingly, one phenotype is more frequent than the remainder. The results show that there is no significant genetic variation between the S. mansoni isolates from man and the rodents, Arvicanthis niloticus and Mastomys huberti.

Description, distribution and ecology of endemic Tasmanian quillwort, Isoetes jarmaniae, sp. nov. (Isoetaceae; Lycopodiopsida)

Phytotaxa ◽  
2021 ◽  
Vol 522 (1) ◽  
pp. 27-37
Author(s):  
DANIEL F. BRUNTON ◽  
MICHAEL GARRETT ◽  
PAUL C. SOKOLOFF ◽  
GINTARAS KANTVILAS
Keyword(s):  
Diploid Species ◽  
Geographic Range ◽  
The Other ◽  
South American ◽  
The South ◽  
Triangular Shape ◽  
South West ◽  
Distribution And Ecology ◽  
River Valleys

Isoetes jarmaniae sp. nov. is described as a new lycophyte endemic to Tasmania, Australia, where it is confined to peat-bound karstic wetlands in several river valleys in the south-west wilderness. While seemingly morphologically closest to I. drummondii, this quillwort has features that are globally uncommon in Isoetes and unknown in other Australasian taxa. Most notable are its markedly flattened, strongly recurved leaves and disproportionately large sporangium ligules that are more suggestive of South American than Australian taxa. As well, the exceptionally thin and wide (alate) megaspore equatorial ridge is swollen at suture intersections, presenting a slightly triangular shape suggestive of the Indian taxon I. udupiensis. The microspores of I. jarmaniae exhibit exceptionally, perhaps uniquely, fine-papillate ornamentation. An original key placing I. jarmaniae in context with the other Tasmanian Isoetes species is provided. This diminutive, apparently diploid species is evidently maintaining a self-sustaining population within a regionally unique habitat and small geographic range.

A molecular analysis reveals hidden species diversity within the current concept of Russula maculata (Russulaceae, Basidiomycota)

Phytotaxa ◽  
2016 ◽  
Vol 270 (2) ◽  
pp. 71 ◽  
Author(s):  
SLAVOMÍR ADAMČÍK ◽  
MIROSLAV CABOŇ ◽  
URSULA EBERHARDT ◽  
MALKA SABA ◽  
FELIX HAMPE ◽  
...  
Keyword(s):  
Species Diversity ◽  
Molecular Analysis ◽  
Morphological Characteristics ◽  
Its Region ◽  
The Other ◽  
Deciduous Forests ◽  
European Species ◽  
Spore Ornamentation ◽  
Sister Clade ◽  
Broad Concept

The current generally accepted concept of Russula maculata defines the species by yellow-brownish spots on the basidiomata, an acrid taste, a yellow spore print and a red pileus. This concept was tested using collections originating from various geographical areas mainly in Europe. Analyses of the ITS region suggested that there were three species within this broad concept. One of them, R. maculata, was identified based on the sequence from the epitype. Two other species, R. nympharum and R. sp., are described here as newly identified species. The European species R. maculata and R. nympharum grow in deciduous forests, are similar in their field aspect and are distinctly different in micro-morphological characteristics of spores, pleurocystidia and pileipellis. An Asian species, R. sp., is associated with pine and has smaller basidiomata and spores. These three species form the R. maculata complex and represent the sister clade to the R. globispora complex. This clade consists of species also characterized by a yellow-brownish context discolouration but with a different type of spore ornamentation. All of the other tested species had an acrid taste and yellow spore print but did not have a conspicuous yellow-brownish context discolouration and were placed in various unrelated clades.

scholarly journals Experimentally induced differentiation of slow tonic and fast twitch muscles in the chick

1979 ◽  
Vol 36 (1) ◽  
pp. 137-154
Author(s):  
D.E. Ashhurst ◽  
G. Vrbova
Keyword(s):  
Latissimus Dorsi ◽  
Neuromuscular Junctions ◽  
Morphological Characteristics ◽  
Morphological Features ◽  
Contractile Properties ◽  
The Other ◽  
Induced Differentiation ◽  
Anterior Latissimus Dorsi ◽  
Fast Twitch Muscle ◽  
Fast Twitch

The anterior latissimus dorsi (ALD) muscle of chickens is a slow tonic muscle, while the posterior latissimus dorsi (PLD) is a fast twitch muscle. These muscles on opposite sides of a 3-week-old chick were removed, minced and replaced in the site of the other muscle and left to regenerate. The regenerating muscles were examined at various periods from 4 days onwards and their contractile properties were found to resemble those typical of the muscle they replaced and not the original muscle. The regenerating muscles from 8 days onwards displayed the morphological features of the control muscles in the contralateral site. By 14 days, differentiation was almost complete and neuromuscular junctions were seen. It is suggested that the physiological and morphological characteristics of a muscle are determined by its position and possibly also by its innervation.

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