Genotypic diversity and genetic structure of populations of the distylous aquatic plant Nymphoides peltata (Menyanthaceae) in China

2013 ◽  
Vol 51 (5) ◽  
pp. 536-544 ◽  
Author(s):  
Yi-Ying LIAO ◽  
Xiao-Li YUE ◽  
You-Hao GUO ◽  
Wahiti Robert GITURU ◽  
Qing-Feng WANG ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Aquatic Plant ◽  
Genotypic Diversity ◽  
Genetic Structure Of Populations ◽  
Nymphoides Peltata

scholarly journals Sexual Reproduction Plays a Major Role in the Genetic Structure of Populations of the Fungus Mycosphaerella graminicola

Genetics ◽  
1996 ◽  
Vol 142 (4) ◽  
pp. 1119-1127 ◽  
Author(s):  
Ruey-Shyang Chen ◽  
Bruce A McDonald
Keyword(s):  
Genetic Structure ◽  
Asexual Reproduction ◽  
Pathogenic Fungus ◽  
Random Mating ◽  
Genotypic Diversity ◽  
Mycosphaerella Graminicola ◽  
Dna Fingerprints ◽  
Genetic Structure Of Populations ◽  
Sexual And Asexual Reproduction ◽  
Single Field

Abstract The relative contributions of sexual and asexual reproduction to the genetic structure of populations can be difficult to determine for fungi that use a mixture of both types of propagation. Nuclear RFLPs and DNA fingerprints were used to make indirect and direct measures of departures from random mating in a population of the plant pathogenic fungus Mycosphaerella graminicola during the course of an epidemic cycle. DNA fingerprints resolved 617 different genotypes among 673 isolates sampled from a single field over a 3-month period. Only 7% of the isolates represented asexual clones that were found more than once in the sample. The most common clone was found four times. Genotypic diversity averaged 85% of its maximum possible value during the course of the epidemic. Analyses of multilocus structure showed that allelic distributions among RFLP loci were independent. Pairwise comparisons between individual RFLP loci showed that the majority of alleles at these loci were in gametic equilibrium. Though this fungus has the capacity for a significant level of asexual reproduction, each analysis suggested that M. graminicola populations maintain a genetic structure more consistent with random-mating over the course of an epidemic cycle.

Genetic Relationships of Cory's Shearwater: Parentage, Mating Assortment, and Geographic Differentiation Revealed by DNA Fingerprinting

The Auk ◽  
2000 ◽  
Vol 117 (3) ◽  
pp. 651-662 ◽  
Author(s):  
Corinne Rabouam ◽  
Vincent Bretagnolle ◽  
Yves Bigot ◽  
Georges Periquet
Keyword(s):  
Genetic Variation ◽  
Genetic Structure ◽  
Dna Fingerprinting ◽  
Genetic Relatedness ◽  
Isolation By Distance ◽  
Genetic Relationships ◽  
Cory’S Shearwater ◽  
Genetic Structure Of Populations ◽  
The Social ◽  
Calonectris Diomedea

Abstract We used DNA fingerprinting to assess genetic structure of populations in Cory's Shearwater (Calonectris diomedea). We analyzed mates and parent-offspring relationships, as well as the amount and distribution of genetic variation within and among populations, from the level of subcolony to subspecies. We found no evidence of extrapair fertilization, confirming that the genetic breeding system matches the social system that has been observed in the species. Mates were closely related, and the level of genetic relatedness within populations was within the range usually found in inbred populations. In contrast to previous studies based on allozymes and mtDNA polymorphism, DNA fingerprinting using microsatellites revealed consistent levels of genetic differentiation among populations. However, analyzing the two subspecies separately revealed that the pattern of genetic variation among populations did not support the model of isolation by distance. Natal dispersal, as well as historic and/or demographic events, probably contributed to shape the genetic structure of populations in the species.

scholarly journals Genetic structure of populations of Legionella pneumophila.

1985 ◽  
Vol 163 (3) ◽  
pp. 1021-1037 ◽  
Author(s):  
R K Selander ◽  
R M McKinney ◽  
T S Whittam ◽  
W F Bibb ◽  
D J Brenner ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Legionella Pneumophila ◽  
Genetic Structure Of Populations
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