Breakdown in Postmating Isolation and the Collapse of a Species Pair through Hybridization

2010 ◽  
Vol 175 (1) ◽  
pp. 11-26 ◽  
Author(s):  
Jocelyn E. Behm ◽  
Anthony R. Ives ◽  
Janette W. Boughman
Keyword(s):  
Species Pair ◽  
Postmating Isolation

Umbilicaria Propagulifera New to The Northern Hemisphere

1982 ◽  
Vol 14 (1) ◽  
pp. 47-52 ◽  
Author(s):  
P. B. Topham ◽  
M. R. D. Seaward ◽  
E. A. Bylińska
Keyword(s):  
Northern Hemisphere ◽  
Morphological Description ◽  
Species Pair

AbstractUmbilicaria propagulifera (Vainio) Llano is reported as new to Poland. A morphological description is given and its distribution in both southern and northern hemispheres is established. U. vellea var. dendrophora is considered to be a synonym. The chemistry of U. propagulifera is variable. Its affinities within the genus and its possible relationship, as a species pair, with U. cylindrica are discussed.

scholarly journals Premating and postmating isolation among local populations of freshwater shrimp Palaemon paucidens in Japan.

1990 ◽  
Vol 56 (9) ◽  
pp. 1407-1411 ◽  
Author(s):  
Lucia Fidhiany ◽  
Akihiro Kijima ◽  
Yoshihisa Fujio
Keyword(s):  
Freshwater Shrimp ◽  
Postmating Isolation ◽  
Local Populations

Evaluating the Effect of Postmating Isolation Between Molecular Forms of Anopheles gambiae (Diptera: Culicidae)

2007 ◽  
Vol 44 (1) ◽  
pp. 60-64 ◽  
Author(s):  
Abdoulaye Diabaté ◽  
Roch K. Dabire ◽  
Niama Millogo ◽  
Tovi Lehmann
Keyword(s):  
Anopheles Gambiae ◽  
Molecular Forms ◽  
Postmating Isolation

scholarly journals Ecological Divergence and the Origins of Intrinsic Postmating Isolation with Gene Flow

2011 ◽  
Vol 2011 ◽  
pp. 1-15 ◽  
Author(s):  
Aneil F. Agrawal ◽  
Jeffrey L. Feder ◽  
Patrik Nosil
Keyword(s):  
Linkage Disequilibrium ◽  
Gene Flow ◽  
Natural Selection ◽  
Theoretical Models ◽  
Ecological Speciation ◽  
Divergent Selection ◽  
Postmating Isolation ◽  
Divergent Natural Selection ◽  
Mathematical Exploration ◽  
Neutral Gene

The evolution of intrinsic postmating isolation has received much attention, both historically and in recent studies of speciation genes. Intrinsic isolation often stems from between-locus genetic incompatibilities, where alleles that function well within species are incompatible with one another when brought together in the genome of a hybrid. It can be difficult for such incompatibilities to originate when populations diverge with gene flow, because deleterious genotypic combinations will be created and then purged by selection. However, it has been argued that if genes underlying incompatibilities are themselves subject to divergent selection, then they might overcome gene flow to diverge between populations, resulting in the origin of incompatibilities. Nonetheless, there has been little explicit mathematical exploration of such scenarios for the origin of intrinsic incompatibilities during ecological speciation with gene flow. Here we explore theoretical models for the origin of intrinsic isolation where genes subject to divergent natural selection also affect intrinsic isolation, either directly or via linkage disequilibrium with other loci. Such genes indeed overcome gene flow, diverge between populations, and thus result in the evolution of intrinsic isolation. We also examine barriers to neutral gene flow. Surprisingly, we find that intrinsic isolation sometimes weakens this barrier, by impeding differentiation via ecologically based divergent selection.

Two new species of Leptarma (Decapoda, Brachyura, Sesarmidae) from the Western Indian Ocean with notes on their phylogeny

Zootaxa ◽  
2020 ◽  
Vol 4816 (4) ◽  
pp. 439-456
Author(s):  
ADNAN SHAHDADI ◽  
CHRISTOPH D. SCHUBART
Keyword(s):  
New Species ◽  
Indian Ocean ◽  
Relative Length ◽  
Western Indian Ocean ◽  
Cox1 Gene ◽  
Congeneric Species ◽  
Species Pair ◽  
Two New Species ◽  
Close Relationship ◽  
De Man

Two new species of Leptarma, L. dispersum n. sp. and L. reunionense n. sp. are described from Europa Island and Réunion Island, respectively. Genetically, based on the mitochondrial COX1 gene, both species are markedly divergent from other congeneric species. Phylogenetically, L. dispersum n. sp. shows close relationship with L. lenzii (De Man, 1895) while L. reunionense n. sp. clusters with L. aurifrons (Li, Ng & Shih, 2019) and the species pair L. moluccense (De Man, 1892) and L. paucitorum (Rahayu & Ng, 2009). Morphologically, the new species differ most significantly from congeners by the relative length of the ambulatory legs and the shapes of the first gonopods and carapace. After the description of these two new species, the number of species comprised in the genus Leptarma is raised to 20, four of them being distributed in and off East Africa. 

ALLOZYME VARIATION IN COREOPSIS NUECENSOIDES AND C. NUECENSIS (COMPOSITAE), A PROGENITOR-DERIVATIVE SPECIES PAIR

Evolution ◽  
1982 ◽  
Vol 36 (2) ◽  
pp. 379-386 ◽  
Author(s):  
Daniel J. Crawford ◽  
Edwin B. Smith
Keyword(s):  
Allozyme Variation ◽  
Species Pair

Chloroplast DNA variation inCoreopsis nuecensoides andC. nuecensis (Asteraceae), a presumed progenitor-derivative species pair

1999 ◽  
Vol 218 (1-2) ◽  
pp. 5-12 ◽  
Author(s):  
Roberta J. Mason-Gamer ◽  
Kent E. Holsinger ◽  
Robert K. Jansen
Keyword(s):  
Chloroplast Dna ◽  
Species Pair ◽  
Dna Variation ◽  
Chloroplast Dna Variation

Nuclear DNA Contents of Coreopsis nuecensoides and C. nuecensis (Asteraceae), a Progenitor-Derivative Species Pair

1984 ◽  
Vol 145 (2) ◽  
pp. 240-245 ◽  
Author(s):  
H. James Price ◽  
Daniel J. Crawford ◽  
Randall J. Bayer
Keyword(s):  
Nuclear Dna ◽  
Species Pair ◽  
Dna Contents ◽  
Nuclear Dna Contents

scholarly journals Reaction of wheat plants and alternative hosts to Magnaporthe oryzae

2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Lucas Gustavo Yock Durante ◽  
Lilian Maria Arruda Bacchi ◽  
Jessica Evangelista de Souza ◽  
Felipe André Sganseria Graichen
Keyword(s):  
Cell Death ◽  
Magnaporthe Oryzae ◽  
Plant Pathogen ◽  
Host Plants ◽  
Blast Disease ◽  
Plant Responses ◽  
Defensive Response ◽  
Species Pair ◽  
Digitaria Sanguinalis ◽  
Plant Pathogen Interactions

ABSTRACT: Blast disease, caused by the fungus Magnaporthe oryzae, has a major impact on wheat farming. The study of plant responses to pathogens has improved the management of this disease. Moreover, it is important to identify potential host plants in the crops’ vicinity and to understand reactions caused by plant-pathogen interactions. The objective of this study was to assess the histopathology of wheat plants, Digitaria insularis and Digitaria sanguinalis inoculated with M. oryzae isolates obtained either rice or wheat plants. Thirty-three days after sowing, greenhouse-grown plants of all three species were inoculated with each M. oryzae isolate. The observed effects (48 hours after inoculation) differed depending on the particular interaction between each pathogen isolate-plant species pair. For instance, wheat and D. sanguinalis had the weakest defensive response against spore germination, production of melanized appressoria, and appressorial penetration, with average values above 87, 90, and 43%, respectively, for these events in these plants. Furthermore, germination and appressoria melanization were more aggressive in the rice isolate than in the wheat isolate. Additionally, evidence for a defensive response (such as cell death) was observed in wheat plants inoculated with rice isolates. However, such a response was absent in plants inoculated using wheat isolates, presumably because pathogen recognition failed.

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