THE SIGNIFICANCE OF CROSS-FERTILIZATION AND SELF-FERTILIZATION FOR PRESERVING POPULATIONS’ STABILITY OF DOMINANT (LYMNAEA STAGNALIS) AND RARE (STAGNICOLA CORVUS) SPECIES OF FRESHWATER PULMONARY MOLLUSKS

2019 ◽  
Keyword(s):  
Lymnaea Stagnalis ◽  
Self Fertilization ◽  
Cross Fertilization

Cross-fertilization as a reproductive strategy in a tissue flukesDidymosulcus katsuwonicola(Platyhelmintes: Didymozoidae) inferred by genetic analysis

Parasitology ◽  
2015 ◽  
Vol 142 (11) ◽  
pp. 1422-1429
Author(s):  
IVONA MLADINEO ◽  
MARINA TOMAŠ ◽  
RINO STANIĆ
Keyword(s):  
Life Cycle ◽  
Haplotype Diversity ◽  
Common Mechanism ◽  
High Haplotype Diversity ◽  
Atlantic Bluefin Tuna ◽  
Food Borne ◽  
Self Fertilization ◽  
Successful Fulfillment ◽  
Cross Fertilization ◽  
Host Tissues

SUMMARYMitochondrial DNA locus cytochrome oxidase I was used to asses intraspecific genetic diversity of a didymozoid speciesDidymosulcus katsuwonicola.Adult forms of this species live encapsulated in pairs in the gills of the reared Atlantic bluefin tuna (Thunnus thynnus). The life cycle of this food-borne parasites and its migration in the host tissues after releasing from the digestive tract to the definitive site in the gills are unknown. Our goal was to assess whether two encysted didymozoids share the same haplotype, indicative of a common maternal origin, as well as the extent of cross- in respect to self-fertilization strategy. Intraspecific comparison showed high haplotype diversity, while the presence of two matching haplotypes within a single cyst encompassed only 17% of sampled individuals. This infers that cross-fertilization between paired individuals within the cyst is more common mechanism than self-fertilization. Such hermaphroditic parasite's trait suggests the existence of intricate infection and reproduction mechanisms, presumably as an adaptation for successful fulfillment of their indirect life cycle through dissemination of genetically more diverse and consequently more fit offspring.

Flower drop and fruit set in field beans, Vicia faba L.

1969 ◽  
Vol 72 (1) ◽  
pp. 131-138 ◽  
Author(s):  
A. E. Kambal
Keyword(s):  
Vicia Faba ◽  
Fruit Set ◽  
Local Strain ◽  
Insect Pollination ◽  
Pod Yield ◽  
Vicia Faba L ◽  
Before And After ◽  
Self Fertilization ◽  
Cross Fertilization ◽  
Field Beans

SUMMARYThe percentage of the total buds produced that dropped before reaching the mature pod stage was estimated as 86·7% in Baladi, a local strain of field beans, and 93·7% in Giza 1, a variety introduced from Egypt. The drop was appreciable both before and after fertilization. There were indications that both inadequate insect pollination and inter-ovary competition contributed to the reduction of pod yield.Self pollen was detected on the stigma in the bud stage 2–3 days before the flower was open. Estimates of natural cross-fertilization ranged from 35·8 to 42·1%, indicating that self-pollination did not lead to complete self fertilization. Hand manipulation of the flowers increased pod set in most of the cases but the line 1W did not respond to this treatment and proved to be highly autofertile.

scholarly journals SELF-FERTILIZATION VERSUS CROSS-FERTILIZATION IN THE HERMAPHRODITIC FRESHWATER SNAIL BULINUS GLOBOSUS

Evolution ◽  
1991 ◽  
Vol 45 (5) ◽  
pp. 1136-1146 ◽  
Author(s):  
Philippe Jarne ◽  
Luc Finot ◽  
Bernard Delay ◽  
Louis Thaler
Keyword(s):  
Freshwater Snail ◽  
Self Fertilization ◽  
Bulinus Globosus ◽  
Cross Fertilization

Predominance of outcrossing in Lymnaea stagnalis despite low apparent fitness costs of self-fertilization

2007 ◽  
Vol 20 (3) ◽  
pp. 901-912 ◽  
Author(s):  
M. PUURTINEN ◽  
K. EMILY KNOTT ◽  
S. SUONPÄÄ ◽  
K. NISSINEN ◽  
V. KAITALA
Keyword(s):  
Lymnaea Stagnalis ◽  
Fitness Costs ◽  
Self Fertilization

scholarly journals AGE-CORRELATED CHANGES IN EXPRESSION OF MICRONUCLEAR DAMAGE AND REPAIR IN PARAMECIUM TETRAURELIA

Genetics ◽  
1977 ◽  
Vol 87 (2) ◽  
pp. 259-274
Author(s):  
Steven R Rodermel ◽  
Joan Smith-Sonneborn
Keyword(s):  
Life Span ◽  
High Mortality ◽  
Ultraviolet Irradiation ◽  
Paramecium Tetraurelia ◽  
Dark Repair ◽  
Abrupt Increase ◽  
Self Fertilization ◽  
Cross Fertilization

ABSTRACT In Paramecium, age is defined as the number of mitotic divisions which have elapsed since the previous cross-fertilization (conjugation) or self-fertilization (autogamy). As the mitotic interval between fertilizations increases, the percentage of nonviable progeny clones increases. In the current study, resolution of conflicting previous reports on the pattern of increase of death and reduced viability in progeny from aging parent cells is found. Some exautogamous clones exhibit a high mortality at young clonal ages, others show no mortality throughout their life span, but most (73%) show an abrupt increase in the percent death and reduced viability in progeny from cells 50-80 fissions old. Ultraviolet-irradiation-induced micronuclear mutations, repairable by photoreactivation, increased with increased clonal age when monitored by percent death and reduced viability of exautogamous progeny of irradiated cells. Loss of dark repair is considered a contributor to the increased expression of micronuclear mutations with increased clonal age.

scholarly journals Serological estimation of the level of cross-fertilization in the monoecious liverwort Pellia epiphylla n = 9

2014 ◽  
Vol 56 (3) ◽  
pp. 391-398
Author(s):  
Wiesław Prus-Głowacki ◽  
Roman Zieliński
Keyword(s):  
Life Cycle ◽  
Genetic Variability ◽  
Shikimic Acid ◽  
Self Incompatibility ◽  
Protein Antigens ◽  
Acid Dehydrogenase ◽  
Self Fertilization ◽  
Cross Fertilization

Using protein antigens as markers, antigenic differentiation of progenies obtained from individual sporangia was examined. The experiments were expected to permit estimation of cross-fertilization frequency in the monoecious liverwort species, <em>Pellia epiphylla</em>, n = 9. The results obtained indicated segregation into two serological types, i.e. pointed to cross-fertilization, in approximately, 80% progenies. In correlation with electrophoretic studies, employing two peroxidase alleles and two shikimic acid dehydrogenase alleles as markers, the result made possible the establishment of cross-fertilization frequency at approximately 93% The data may indicate an absence of self-fertilization in this liverwort species and, thus, self-incompatibility. This may be included among the facors responsible for maintenance of genetic variability in populations of this species, in which haplophase is the prevalent phase of its life-cycle.

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