scholarly journals Defence responses of native and invasive plants to the native generalist vine parasite Cassytha pubescens – anatomical and functional studies

2020 ◽  
Vol 68 (4) ◽  
pp. 300
Author(s):  
Evelina Facelli ◽  
Noriko Wynn ◽  
Hong T. Tsang ◽  
Jennifer R. Watling ◽  
José M. Facelli
Keyword(s):  
Host Species ◽  
Vascular System ◽  
The Other ◽  
Defence Mechanisms ◽  
Functional Studies ◽  
Defence Responses ◽  
Native Parasite ◽  
Effective Transfer ◽  
Native Host ◽  
Potential Use

We investigated the responses of two invasive and two native host species to the parasitic vine Cassytha pubescens R.Br. using glasshouse experiments. We assessed growth of the parasite and its hosts, and anatomy and functionality of haustoria. Target hosts were infected using C. pubescens already established on a donor host. This enabled measurement of growth in target hosts that were detached (parasite connection severed) or not from the donor host. Haustorial connections to hosts were investigated using histological methods. We tested the functionality of haustoria in one invasive and one native host using radiolabelled phosphorus (32P). After it was severed from the donor host, C. pubescens grew poorly on the native host, Acacia myrtifolia (Sm.)Willd. This was likely due to a lack of effective functional haustorial development because although haustoria were firmly attached and morphologically alike those formed on the other hosts, their anatomy was different: their connections with the vascular system were not developed and there was no transfer of 32P from A. myrtifolia to the parasite. In contrast, the other three host species supported the growth of the parasite and had fully developed haustoria. Effective transfer of 32P from the invasive host to the parasite confirmed this. Our results suggest a range of defence mechanisms in C. pubescens hosts and are consistent with reports of strong detrimental effects on invasive hosts. Further, they amount to evidence for the potential use of a native parasite as biological control for invasive species.

The Vascular Structure of the Kidney of Mallards and Doves

1999 ◽  
Vol 5 (S2) ◽  
pp. 1192-1193
Author(s):  
H. Ditrich
Keyword(s):  
Vascular System ◽  
Venous Drainage ◽  
Portal System ◽  
Physiological Data ◽  
Vascular Structure ◽  
Serial Sections ◽  
Functional Importance ◽  
Additional Material ◽  
Functional Studies ◽  
Primitive Feature

The architecture of the kidney of birds (and also reptiles) is, unlike in mammalians, mainly determined by the organization of the blood vascular system. Besides arterial supply and venous drainage, the renal portal system forms a main structural component. While the latter was often regarded as a “primitive” feature in the literature, morphological and physiological data reveal its great functional importance.Microvascular corrosion casts studied in the scanning electron microscope permit the visualization of minute vessels, retaining their 3D-arrangement. Additionally, when compared with graphical reconstructions of serial sections, this method avoids several inherent artifacts like fixation and dehydration shrinkage as well as the compression of the object by the sectioning blade. Most of the studies on avian kidneys with this technique used the domestic chicken as a model. In order to provide additional material for comparative and functional studies, data on the intrarenal vascular structure of other species are required.

scholarly journals Higher mortality of the less suitable brown trout host compared to the principal Atlantic salmon host when infested with freshwater pearl mussel (Margaritifera margaritifera) glochidia

2021 ◽  
Author(s):  
Janhavi Marwaha ◽  
Per Johan Jakobsen ◽  
Sten Karlsson ◽  
Bjørn Mejdell Larsen ◽  
Sebastian Wacker
Keyword(s):  
Atlantic Salmon ◽  
Brown Trout ◽  
Host Species ◽  
Salmo Trutta ◽  
The Other ◽  
Margaritifera Margaritifera ◽  
Pearl Mussel ◽  
Suitable Host ◽  
Freshwater Pearl Mussel ◽  
Host Interaction

AbstractThe freshwater pearl mussel (Margaritifera margaritifera) is a highly host-specific parasite, with an obligate parasitic stage on salmonid fish. Atlantic salmon (Salmo salar) and brown trout (Salmo trutta f. trutta and Salmo trutta f. fario) are the only hosts in their European distribution. Some M. margaritifera populations exclusively infest either Atlantic salmon or brown trout, while others infest both hosts with one salmonid species typically being the principal host and the other a less suitable host. Glochidial abundance, prevalence and growth are often used as parameters to measure host suitability, with the most suitable host species displaying the highest parameters. However, it is not known if the degree of host specialisation will negatively influence host fitness (virulence) among different host species. In this study we examined the hypothesis that glochidial infestation would result in differential virulence in two salmonid host species and that lower virulence would be observed on the most suitable host. Atlantic salmon and brown trout were infested with glochidia from two M. margaritifera populations that use Atlantic salmon as their principal host, and the difference in host mortality among infested and control (sham infested) fish was examined. Higher mortality was observed in infested brown trout (the less suitable host) groups, compared to the other test groups. Genetic assignment was used to identify offspring from individual mother mussels. We found that glochidia from individual mothers can infest both the salmonid hosts; however, some mothers displayed a bias towards either salmon or trout. We believe that the differences in host-dependent virulence and the host bias displayed by individual mothers were a result of genotype × genotype interactions between the glochidia and their hosts, indicating that there is an underlying genetic component for this parasite-host interaction.

scholarly journals Impacts of a native parasitic plant on an introduced and a native host species: implications for the control of an invasive weed

2008 ◽  
Vol 103 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Jane Prider ◽  
Jennifer Watling ◽  
José M. Facelli
Keyword(s):  
Host Species ◽  
Parasitic Plant ◽  
Invasive Weed ◽  
Native Host

scholarly journals A new species of Tomopterna (Anura: Ranidae) from the Kruger National Park, with notes on related species

Koedoe ◽  
1975 ◽  
Vol 18 (1) ◽  
Author(s):  
N. I. Passmore ◽  
V. C. Carruthers
Keyword(s):  
New Species ◽  
National Park ◽  
Kruger National Park ◽  
The Other ◽  
Defence Mechanisms ◽  
Calling Behaviour ◽  
Mating Call ◽  
Mating Calls ◽  
New Form ◽  
A New Species

A new species of Tomoptema, T. krugerensis, sp. n., has been recorded from the Kruger National Park, Republic of South Africa.Morphologically it is very similar to T. delalandei cryptotis (Boulenger) but the mating call is markedly different from that of the other members of the genus and this is coupled with small but consistent morphological differences.T. krugerensis sp. n. is known to occur only on a portion of the western fringe of the vast sandveld areas of Mozambique, but possibly has a much wider distribution. Mating call, calling behaviour, eggs, early development and defence mechanisms are described. The affinities of the new form are discussed and the mating calls of other members of the genus are reviewed. Mating call is again shown to be a sensitive non-morphological taxonomic tool.

Plant-specific VQ-domain proteins as interaction partners of WRKY transcription factors

2014 ◽  
Vol 12 (S1) ◽  
pp. S121-S124
Author(s):  
Soon Il Kwon ◽  
D. J. Hwang
Keyword(s):  
Transcription Factors ◽  
Biological Effects ◽  
Plant Stress ◽  
Plant Defence ◽  
Genomic Analysis ◽  
Wrky Transcription Factors ◽  
Defence Mechanisms ◽  
Interaction Partners ◽  
Defence Responses ◽  
Plant Defence Responses

VQ-domain proteins are known to interact with WRKY transcription factors and have been reported to be involved in plant defence responses to environmental stresses in Arabidopsis. Thus, elucidation of the defence mechanisms during the interaction of VQ-domain proteins and WRKY transcription factors could provide useful insights into the regulation of VQ-domain protein-mediated WRKY transcription factors. As the focus of this review, we summarize the genomic analysis of the VQ-domain proteins as one of the WRKY-interacting proteins and their biological effects during plant stress conditions in Arabidopsis and rice.

An Approximate Procedure for the Solution of a Class of Transient-Wave Diffraction Problems

1966 ◽  
Vol 33 (1) ◽  
pp. 168-172 ◽  
Author(s):  
L. A. Peralta ◽  
G. F. Carrier ◽  
C. C. Mow
Keyword(s):  
Harmonic Wave ◽  
Elastic Solid ◽  
The Other ◽  
Wave Problem ◽  
Transient Wave ◽  
Harmonic Response ◽  
Elastic Systems ◽  
Computational Difficulty ◽  
Approximate Procedure ◽  
Potential Use

The description of even the gross features of the response to an incident stress pulse of an infinite elastic solid with a hole or obstruction requires very extensive calculations [1]. On the other hand, the response of such elastic systems to a harmonic incident wave is much less intricate. It is well known that the response to any given incident pulse can be constructed from the solution of the harmonic wave problem. Furthermore, it is clear that the computational difficulty associated with this synthesis can be reduced enormously when a suitable, algebraically simple approximation to the harmonic response can be found. In this paper, a useful rule for choosing the appropriate approximation to the harmonic wave response is presented. This method is shown to give results in agreement with known solutions. The procedure is also applied to problems where only solutions to the harmonic wave case are available. The most important potential use of the technique lies in the possibility that, for some classes of structures, one may be able to identify the parameters of the approximate harmonic response with simple macroscopic properties of the system. Such an identification would not only save much labor but would also identify design criteria for the optimization of the system.

Hemodialysis during cardiopulmonary resuscitation in patients with severe metabolic acidosis

2018 ◽  
Vol 41 (8) ◽  
pp. 431-436 ◽  
Author(s):  
Tuncay Sahutoglu ◽  
Elif Sahutoglu
Keyword(s):  
Metabolic Acidosis ◽  
Cardiopulmonary Resuscitation ◽  
High Efficiency ◽  
Spontaneous Circulation ◽  
The Other ◽  
Unresolved Issue ◽  
Severe Metabolic Acidosis ◽  
Hospital Records ◽  
Return Of Spontaneous Circulation ◽  
Potential Use

Background/Aims: Severe metabolic acidosis during cardiopulmonary resuscitation is an important and yet unresolved issue. The potential use of hemodialysis for severe metabolic acidosis during cardiopulmonary resuscitation was investigated. Methods: Acute hemodialyses between January 2012 and April 2017 were reviewed for patients with concomitant hemodialysis and cardiopulmonary resuscitation. In addition, MEDLINE was searched for similar reports. Data were extracted from hospital records. Results: Two patients (36M, 70F) were found to study, without similar reports in MEDLINE. Cardiac arrests (in-hospital) occurred due to severe metabolic acidosis in both patients (due to ethylene glycol and metformin intoxications, respectively). Return of spontaneous circulation could not be obtained within the first 28 and 30 min of cardiopulmonary resuscitation only, whereas both patients had return of spontaneous circulation following at least 45 min of concomitant hemodialysis and cardiopulmonary resuscitation. One patient (70F) was discharged with good neurological outcome, but the other died. Conclusion: The addition of high-efficiency hemodialysis during cardiopulmonary resuscitation may contribute to the return of spontaneous circulation in patients with severe metabolic acidosis due to intoxication.

scholarly journals Current Therapeutic Approaches in Metastatic and Recurrent Ewing Sarcoma

Sarcoma ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Michael Huang ◽  
Kenneth Lucas
Keyword(s):  
Ewing Sarcoma ◽  
Survival Rates ◽  
Salvage Chemotherapy ◽  
Common Type ◽  
The Other ◽  
Therapeutic Approaches ◽  
Primary Bone ◽  
Children And Young Adults ◽  
Improvement In Survival ◽  
Potential Use

Ewing sarcoma (ES) is the second most common type of primary bone malignancy in children and young adults. Survival rates for localized ES have improved to upwards of 70% with aggressive chemotherapy and local control. On the other hand, there has been little improvement in survival rates for patients with metastatic or recurrent ES. Herein we review the different current therapeutic approaches available, including the different upfront and salvage chemotherapy regimens, the role for stem cell transplantation, and potential use of immunotherapy.

Neotropical jumping plant-lice (Hemiptera, Psylloidea) associated with plants of the tribe Detarieae (Leguminosae, Detarioideae)

Zootaxa ◽  
2020 ◽  
Vol 4733 (1) ◽  
pp. 1-73
Author(s):  
DANIEL BURCKHARDT ◽  
DALVA L. QUEIROZ
Keyword(s):  
New Species ◽  
New Taxa ◽  
Host Species ◽  
New Genus ◽  
The Other ◽  
New Combinations ◽  
Free Living ◽  
Hymenaea Courbaril ◽  
Colophospermum Mopane ◽  
Copaifera Langsdorffii

The Detarieae, a small tribe of tropical arborescent Leguminosae, has been reported as host of two species of jumping plant-lice: the Neotropical Macrocorsa beeryi (Caldwell) on Hymenaea courbaril and the Afrotropical Retroacizzia mopanei (Pettey) on Colophospermum mopane. Here we add from Brazil 18 new species of Colophorina, Jataiba gen. nov. and Mitrapsylla from Copaifera, as well as nine species of Jataiba gen. nov. and Platycorypha from Hymenaea. In addition to Jataiba, a new genus which is created for five new species on Copaifera and one on Hymenaea, we erect the new genus Apsyllopsis for Psyllopsis mexicana, which is synonymised with Psyllia beeryi Caldwell. Two new combinations are proposed: Apsyllopsis mexicana (Crawford), comb. nov. from Psyllopsis, and Epiacizzia favis (Brown & Hodkinson), comb. nov. from Euphalerus. The new taxa are described and illustrated, and keys are provided for the identification of adults and immatures, as far as known. Immatures of Apsyllopsis and Colophorina induce galls on the leaves whereas those of the other taxa are free-living. Colophorina spp. seem to be monophagous whereas members of the other genera tend to be oligophagous. All host species are associated with two or more psyllid species. Copaifera langsdorffii, which hosts 11 species of three genera, constitutes a super-host. 

Sign in / Sign up

Export Citation Format

Share Document