The number and distribution of incompatibility factors in natural populations of Pleurotus ostreatus and Pleurotus sapidus

1991 ◽  
Vol 69 (10) ◽  
pp. 2187-2191 ◽  
Author(s):  
Neil A. Anderson ◽  
Glenn R. Furnier ◽  
Andrew S. Wang ◽  
John W. Schwandt
Keyword(s):  
Population Genetics ◽  
Mating System ◽  
Key Words ◽  
Pleurotus Ostreatus ◽  
Small Area ◽  
Spatial Clustering ◽  
Natural Populations ◽  
Single Spore ◽  
Single Tree ◽  
Pleurotus Sapidus

Pairings of single-spore isolates from different basidiocarps were made to examine the numbers and distributions of incompatibility factors in the tetrapolar basidiomycetes Pleurotus ostreatus and Pleurotus sapidus. These factors do not appear to be randomly distributed, with multiple basidiocarps on a single tree or log arising from a single mycelium, multiple basidiocarps on a single tree or log sharing a single common monokaryotic parent, and a tendency toward spatial clustering of factors even when multiple basidiocarps from the same tree or log are excluded from the analyses. For one 30-km2 collection area, the estimated numbers of A and B factors in the P. ostreatus population were 126 and 354, respectively, yielding an estimated outbreeding efficiency of 0.99. Estimated outbreeding efficiencies were quite high [Formula: see text] even in a sample taken from a very small area (0.09 m2), illustrating the ability of the tetrapolar mating system to simultaneously prevent self mating and minimize the number of incompatible matings. Key words: Basidiomycotina, fungi, mating system, population genetics.

scholarly journals The population genetics of drug resistance evolution in natural populations of viral, bacterial and eukaryotic pathogens

2015 ◽  
Vol 25 (1) ◽  
pp. 42-66 ◽  
Author(s):  
Benjamin A. Wilson ◽  
Nandita R. Garud ◽  
Alison F. Feder ◽  
Zoe J. Assaf ◽  
Pleuni S. Pennings
Keyword(s):  
Drug Resistance ◽  
Population Genetics ◽  
Natural Populations ◽  
Resistance Evolution

scholarly journals THE EVOLUTION OF SELECTIVELY SIMILAR ELECTRO-PHORETICALLY DETECTABLE ALLELES IN FINITE NATURAL POPULATIONS

Genetics ◽  
1975 ◽  
Vol 80 (2) ◽  
pp. 375-394
Author(s):  
C F Wehrhahn
Keyword(s):  
Population Genetics ◽  
Genetic Variation ◽  
Generating Functions ◽  
Natural Populations ◽  
Net Charge ◽  
Electrophoretic Variants ◽  
Allelic State ◽  
Competing Hypotheses ◽  
State Difference ◽  
General Method

Abstract Most of the models of population genetics are not realistic when applied to data on electrophoretic variants of proteins because the same net charge may result from any of several amino acid combinations. In the absence of realistic models they have, however, been widely used to test competing hypotheses about the origin and maintenance of genetic variation in populations. In this paper I present a general method for determining probability generating functions for electrophoretic state differences. Then I use the method to find allelic state difference distributions for selectively similar electrophoretically detectable alleles in finite natural populations. Predicted patterns of genetic variation, both within and among species, are in reasonable accord with those found in the Drosophila willistoni group by Ayala et al. (1972) and by Ayala and Tracey (1974).

scholarly journals Sewall Wright, 21 December 1889 - 3 March 1988

1990 ◽  
Vol 36 ◽  
pp. 567-579 ◽  
Keyword(s):  
Population Genetics ◽  
Evolutionary Biology ◽  
Natural Populations ◽  
Coat Colour ◽  
Balance Theory ◽  
Theory Of Evolution ◽  
Shifting Balance Theory ◽  
Sewall Wright ◽  
Shifting Balance ◽  
Active Research

Sewall Wright's active life spanned the development of genetics from a new discipline when the principles of inheritance were still being elucidated to the technology of recombinant gene construction and insertion. He was one of the major pioneers of population genetics, which gave a quantitative basis to the studies of evolution, of variation in natural populations and of animal and plant breeding. He contributed most significantly to methods and ideas over a long period, indeed his four volume treatise was written long after he formally ‘retired’ and his last paper (211) was published a few days before his death at the age of 98. In the field of population genetics Wright developed the method of path coefficients, which he used to analyse quantitative genetic variation and relationship, but which has been applied to subjects as diverse as economics, the ideas of inbreeding coefficient and F -statistics which form the basis of analysis of population structure, the theory of variation in gene frequency among populations, and the shifting balance theory of evolution, which remains a topic of active research and controversy. Wright contributed to physiological genetics, notably analysis of the inheritance of coat colour in the guinea pig, and in particular the epistatic relationships among the genes involved. There was a critical interplay between his population and physiological work, in that the analysis of finite populations on the one hand and of epistatic interactions on the other are the bases of Wright’s development of the shifting balance theory. A full and enlightening biography of Sewall Wright which traces his influence on evolutionary biology and his interactions with other important workers was published recently (Provine 1986) and shorter appreciations have appeared since his death, notably by Crow (1988), Wright’s long-time colleague. This biography relies heavily on Provine’s volume, and does no more than summarize Wright’s extensive contributions. Many of his important papers have been reprinted recently (1986).

Population genetics ofCordia alliodora(Boraginaceae), a neotropical tree. 2. Mating system

1995 ◽  
Vol 82 (4) ◽  
pp. 476-483 ◽  
Author(s):  
David H. Boshier ◽  
Michael R. Chase ◽  
Kamaljit S. Bawa
Keyword(s):  
Population Genetics ◽  
Mating System ◽  
Neotropical Tree

On the evolution and population genetics of hybrid-dysgenesis-causing transposable elements in Drosophila

1986 ◽  
Vol 312 (1154) ◽  
pp. 205-215 ◽  
Keyword(s):  
Population Genetics ◽  
Natural Selection ◽  
Transposable Elements ◽  
Transposable Element ◽  
Natural Populations ◽  
Element Composition ◽  
Hybrid Dysgenesis ◽  
Evolutionary Significance ◽  
Genetic Elements ◽  
Transposable Genetic Elements

Much has been learned about transposable genetic elements in Drosophila , but questions still remain, especially concerning their evolutionary significance. Three such questions are considered here, (i) Has the behaviour of transposable elements been most influenced by natural selection at the level of the organism, the population, or the elements themselves? (ii) How did the elements originate in the genome of the species? (iii) Why are laboratory stocks different from natural populations with respect to their transposable element composition? No final answers to these questions are yet available, but by focusing on the two families of hybrid dysgenesis-causing elements, the P and I factors, we can draw some tentative conclusions.

The mating system in natural populations of western redcedar (Thuja plicata)

2001 ◽  
Vol 79 (6) ◽  
pp. 753-756 ◽  
Author(s):  
Lisa M. O'Connell ◽  
Frédérique Viard ◽  
John Russell ◽  
Kermit Ritland
Keyword(s):  
Mating System ◽  
Natural Populations ◽  
Thuja Plicata ◽  
Western Redcedar

scholarly journals Mating system, population genetics, and phylogeography of the devil’s garden ant, Myrmelachista schumanni, in the Peruvian Amazon

2019 ◽  
Vol 67 (1) ◽  
pp. 113-125 ◽  
Author(s):  
P. J. G. Malé ◽  
E. Youngerman ◽  
N. E. Pierce ◽  
M. E. Frederickson
Keyword(s):  
Population Genetics ◽  
Mating System ◽  
Peruvian Amazon
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