scholarly journals Rapid evolution of Wolbachia incompatibility types

2012 ◽  
Vol 279 (1746) ◽  
pp. 4473-4480 ◽  
Author(s):  
Olivier Duron ◽  
Jennifer Bernard ◽  
Célestine M. Atyame ◽  
Emilie Dumas ◽  
Mylène Weill
Keyword(s):  
Reproductive Success ◽  
Dynamic Process ◽  
Culex Pipiens ◽  
Cytoplasmic Incompatibility ◽  
Rapid Evolution ◽  
The Self ◽  
Isofemale Lines ◽  
Individual Host ◽  
Gradual Process ◽  
Self Compatibility

In most insects, the endosymbiont Wolbachia induces cytoplasmic incompatibility (CI), an embryonic mortality observed when infected males mate either with uninfected females or with females infected by an incompatible Wolbachia strain. Although the molecular mechanism of CI remains elusive, it is classically viewed as a modification–rescue model, in which a Wolbachia mod function disables the reproductive success of the sperm of infected males, unless eggs are infected and express a compatible resc function. The extent to which the modification–rescue model can predict highly complex CI pattern remains a challenging issue. Here, we show the rapid evolution of the mod–resc system in the Culex pipiens mosquito. We have surveyed four incompatible laboratory isofemale lines over 50 generations and observed in two of them that CI has evolved from complete to partial incompatibility (i.e. the production of a mixture of compatible and incompatible clutches). Emergence of the new CI types depends only on Wolbachia determinants and can be simply explained by the gain of new resc functions. Evolution of CI types in Cx. pipiens thus appears as a gradual process, in which one or several resc functions can coexist in the same individual host in addition to the ones involved in the self-compatibility. Our data identified CI as a very dynamic process. We suggest that ancestral and mutant Wolbachia expressing distinct resc functions can co-infect individual hosts, opening the possibility for the mod functions to evolve subsequently. This gives a first clue towards the understanding of how Wolbachia reached highly complex CI pattern in host populations.

Reproductive success of Acacia longifolia (Fabaceae, Mimosoideae) in native and invasive populations

2015 ◽  
Vol 63 (5) ◽  
pp. 387 ◽  
Author(s):  
Marta Correia ◽  
Sílvia Castro ◽  
Susana Rodríguez-Echeverría
Keyword(s):  
Reproductive Success ◽  
Seed Size ◽  
Fruit Set ◽  
Lower Number ◽  
Open Pollination ◽  
Native Range ◽  
Reproductive Assurance ◽  
Acacia Species ◽  
Self Compatibility ◽  
Selfing Ability

The reproductive biology of exotic species affects their capacity to become naturalised and invasive in non-native areas. Selfing is a common trait in many invasive plants probably because it provides reproductive assurance under low availability of pollination vectors and sexual partners. Nonetheless, the predominantly self-incompatible Australian Acacia species are among the most aggressive plants worldwide. To address whether there have been changes in selfing ability and natural reproductive success of A. longifolia during invasion, we compared one population in the invaded area (Portugal) with one population in the native range (Australia). We specifically assessed floral traits, fruit set and offspring traits for selfing and open-pollination treatments. Within each pollination treatment, no differences were found between areas, suggesting that the level of self-compatibility has not changed during invasion. However, the number of aborted seeds and seed size were significantly different between pollination treatments in Australia but not in Portugal. There were significant differences in the number of seeds per pod and in seed weight between ranges. A lower number of aborted seeds, a higher number of fully developed seeds and a greater seed size were found in the invaded area for both pollination treatments. In spite of the low selfing ability of A. longifolia in the invaded area, there was an increase in the quantity and size of the seeds produced in the new region, even for self-pollinated fruits, which might contribute to A. longifolia invasiveness.

CORRELATED RESPONSE IN BROWN SARSON

1970 ◽  
Vol 12 (4) ◽  
pp. 905-913 ◽  
Author(s):  
T. Swamy Rao
Keyword(s):  
Gamma Irradiation ◽  
Seed Set ◽  
Previous History ◽  
The Self ◽  
Correlated Response ◽  
History Of ◽  
Self Compatibility ◽  
Selection For ◽  
Direction Opposite ◽  
Brown Sarson

The correlated response with changes in self-compatibility in three varieties of brown sarson subjected to gamma irradiation was examined. Selection for improved seed set in the irradiated populations showed that substantial correlated response can result for a constellation of other characters in which the self-compatible and self-incompatible forms differ. The correlated response was in a direction opposite to that of the previous history of selection.

Hölderlins Homburger Folioheft in diachroner Darstellung

2021 ◽  
Vol 35 (1) ◽  
pp. 99-119
Author(s):  
Hans Gerhard Steimer
Keyword(s):  
Genetic Analysis ◽  
Dynamic Process ◽  
Print Media ◽  
Writing Process ◽  
Spatial Arrangement ◽  
The Other ◽  
Dynamic Evolution ◽  
Late Work ◽  
Gradual Process ◽  
Topographic Representation

Abstract Literary compositional drafts and working manuscripts preserve traces of the gradual process of writing and its different stages. In the static medium of print, genetic editions are confronted with the problem of depicting the dynamic evolution of texts. Presenting the variants in line-by-line synoptic display disregards the spatial arrangement on the manuscript pages. On the other hand, giving a topographic representation of the writing in diplomatic transcripts might stratify it into a few chronological layers but is unable to sufficiently reproduce the dynamic process to an elaborate degree. Consequently, the screen is better suited to visualise the writing process. The digital presentation of the ‘Homburg Folio’, the most important manuscript of Friedrich Hölderlin’s late work, offers not only the transcriptional record as known from print media but displays the process of writing and revision on each of the facsimile’s pages itself (https://homburgfolio.wlb-stuttgart.de). Thus, it is possible to visualise writing both as an act in time and its graphic result on the space of a page. It confines itself to the presentation of the genesis without any constitution of a text. The combination of these different operations has often led to errors. Decoupling the genetic analysis from the extrapolation of text reveals its potential.

scholarly journals Cytoplasmic Incompatibility as a Means of Controlling Culex pipiens quinquefasciatus Mosquito in the Islands of the South-Western Indian Ocean

2011 ◽  
Vol 5 (12) ◽  
pp. e1440 ◽  
Author(s):  
Célestine M. Atyame ◽  
Nicole Pasteur ◽  
Emilie Dumas ◽  
Pablo Tortosa ◽  
Michaël Luciano Tantely ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Culex Pipiens ◽  
Cytoplasmic Incompatibility ◽  
Western Indian Ocean ◽  
The South ◽  
Culex Pipiens Quinquefasciatus

The self-compatibility effect in graded thermoelectric cooler elements

2013 ◽  
Vol 210 (7) ◽  
pp. 1407-1417 ◽  
Author(s):  
Wolfgang Seifert ◽  
G. Jeffrey Snyder ◽  
Eric S. Toberer ◽  
Christophe Goupil ◽  
Knud Zabrocki ◽  
...  
Keyword(s):  
Compatibility Effect ◽  
The Self ◽  
Thermoelectric Cooler ◽  
Self Compatibility

scholarly journals Molecular Analysis of S-haplotypes in Peach, a Self-compatible Prunus Species

2006 ◽  
Vol 131 (6) ◽  
pp. 738-743 ◽  
Author(s):  
Attila Hegedüs ◽  
Zoltán Szabó ◽  
József Nyéki ◽  
Júlia Halász ◽  
Andrzej Pedryc
Keyword(s):  
Prunus Persica ◽  
Fragment Size ◽  
Polyacrylamide Gel Electrophoresis ◽  
Protein A ◽  
Synonymous Substitution ◽  
The Self ◽  
Native Polyacrylamide Gel Electrophoresis ◽  
Self Compatibility ◽  
Length Determination

The most commercially grown peach [Prunus persica (L.) Batsch.] cultivars do not require cross-pollination for reasonable fruit set; however, self-incompatibility is a well-known feature within the Prunoideae subfamily. Isoelectric focusing and native polyacrylamide gel electrophoresis of S-ribonucleases; PCR analyses of S-RNase and S-haplotype-specific F-box genes as well as DNA sequencing were carried out to survey the self-(in)compatibility allele pool and to uncover the nature of self-compatibility in peach. From 25 cultivars and hybrids with considerable diversity in phenotype and origin, only two S-haplotypes were detected. Allele identity could be checked by exact length determination of the PCR-amplified fragments and/or partial sequencing of the peach S1-, S2-, and Prunus davidiana (Carr.) Franch. S1-RNases. S-RNases of peach were detected to possess ribonuclease activity, and a single nucleotide polymorphism in the S1-RNase was shown, which represents a synonymous substitution and does not change the amino acid present at the position in the protein. A 700-bp fragment of the peach SFB gene was PCR-amplified, which is similar to the fragment size of functional Prunus L. SFBs. All data obtained in this study may support the contribution of genes outside the S-locus to the self-compatible phenotype of peaches.

scholarly journals Bees may drive the sexual reproduction of four sympatrically distributed cacti in a vanishing coastal Mediterranean ecosystem

2019 ◽  
Author(s):  
Claudia A. Antinao ◽  
Gastón O. Carvallo ◽  
Beatriz Vergara-Meriño ◽  
Cristian A. Villagra ◽  
Pablo C. Guerrero
Keyword(s):  
Reproductive Success ◽  
Plant Species ◽  
Bird Species ◽  
Sympatric Species ◽  
Breeding Systems ◽  
Mediterranean Ecosystem ◽  
Native Bees ◽  
Evolutionary Mechanisms ◽  
Pollinator Diversity ◽  
Self Compatibility

Background. Sympatric plant species that share pollinators may have similar mating systems because their floral traits are subject to comparable canalization imposed by pollinators. However, if each sympatric species bears specialized floral morphology, each species may attract different pollinators. Our study aims to describe the pollinator diversity and pollination systems of four taxa of Eriosyce that co-occur in an endangered coastal Mediterranean ecosystem in Central Chile. We took two approaches in our study: we assessed the composition and similarity of flower visitors among taxa, and we characterized the breeding systems to determine dependence on pollinators and self-compatibility. Methods. We performed field observations to characterized pollinators during two consecutive years (2016-2017). Additionally, we performed pollination experiments to elucidate reproductive modes using three treatments: manual cross-pollination, automatic self-pollination, and control (unmanipulated individuals). Results. We observed one bird species (Giant hummingbird Patagona gigas only visiting E. subgibbosa) and 14 bee species (13 natives plus Apis mellifera) visiting cacti of the genus Eriosyce. We observed variation in the similarity of intra-specific pollinator composition between years and among Eriosyce species within the same year. Individuals of E. subgibbosa were visited by less number of species (2016 = 4; 2017 = 2), while E. chilensis (2016 = 4; 2017 = 8), E. chilensis var. albidiflora (2016 = 7; 2017 = 4) and E. curvispina var. mutabilis (2016 = 7; 2017 = 6) were visited by a richest guild of visitors (up to 10 bee species each).Autonomous pollination was unfeasible inE. chilensis, which depend on bees to achieve their reproductive success. Eriosyce subgibbosa, visited mainly by the Giant hummingbird, depends on pollinators to achieve reproductive success. Both E. chilensis var. albidiflora and E. curvispina var. mutabilis were visited by a diverse assemblage of non-social native bees, showing some degree of autonomous pollination and self-compatibility. Discussion. Pollinator diversity analyses showed considerable pollinator differences between the species with ornithophilous flowers (E. subgibbosa) and remain taxa which solely dependent on Apoidea species for pollen transfer. The high diversity of native bees among sympatric Eriosyce may be a caused by their microclimatic differences at spatial (differences among cacti microhabitats) and temporal levels (differences of climatic conditions between August to December when different Eriosyce species bloom). Our study contributes to unveiling the evolutionary mechanisms for pollinator partitioning of sympatric close-related plant species. Furthermore, it improves understanding of threatened species reproductive system and ecological interactions, especially to E. chilensis and E. chilensis var. albidiflora, whose studied populations are the only known for these taxa.

scholarly journals SEGREGATION OF CYTOPLASMIC INCOMPATIBILITY PROPERTIES IN CULEX PIPIENS FATIGANS

Genetics ◽  
1977 ◽  
Vol 87 (2) ◽  
pp. 381-390
Author(s):  
Sarala K Subbarao ◽  
B S Krishnamurthy ◽  
C F Curtis ◽  
T Adak ◽  
R K Chandrahas
Keyword(s):  
Culex Pipiens ◽  
Cytoplasmic Incompatibility ◽  
Male Progeny ◽  
Culex Pipiens Fatigans ◽  
Laboratory Colony

ABSTRACT Maternally inherited variants, which arose within a laboratory colony of Culex pipiens fatigans, have been studied by rearing cultures from single egg rafts. Segregation, i.e., variation of cytoplasmic incompatibility properties between the male progeny of individual females, was demonstrated. Also, from the daughters of individual females, sub-lines were derived within which all the males showed the same incompatibility or compatibility properties. Among the descendants of tetracycline-treated individuals were lines which superficially simulated these phenomena, but these lines ultimately reverted to the cytoplasmic compatibility type of the strain which was submitted to the treatment. The types of variations in cytoplasmic incompatibility properties that have been studied are discussed.

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