The Influence of Natural Variation in Population Size on Ecological and Quantitative Genetics of the Endangered Endemic Plant Hypericum cumulicola

2015 ◽  
Vol 176 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Christopher G. Oakley
Keyword(s):  
Population Size ◽  
Quantitative Genetics ◽  
Natural Variation ◽  
Endemic Plant ◽  
Hypericum Cumulicola

scholarly journals Natural Variation for Carbohydrate Content in Arabidopsis. Interaction with Complex Traits Dissected by Quantitative Genetics

2006 ◽  
Vol 141 (4) ◽  
pp. 1630-1643 ◽  
Author(s):  
Fanny Calenge ◽  
Véra Saliba-Colombani ◽  
Stéphanie Mahieu ◽  
Olivier Loudet ◽  
Françoise Daniel-Vedele ◽  
...  
Keyword(s):  
Quantitative Genetics ◽  
Complex Traits ◽  
Natural Variation ◽  
Carbohydrate Content

Population and quantitative genetics of many linked loci in finite populations

1983 ◽  
Vol 219 (1216) ◽  
pp. 253-264 ◽  
Keyword(s):  
Linkage Disequilibrium ◽  
Population Size ◽  
Dna Sequence ◽  
Quantitative Genetics ◽  
Quantitative Traits ◽  
Theoretical Studies ◽  
Population Surveys ◽  
Finite Populations ◽  
Simulation Results ◽  
New Mutations

Theoretical studies on the effects of linkage on variability of quantitative traits and response to directional selection in finite populations are reviewed. Emphasis is given to predictions that can be based on observable parameters, such as population size, chromosome lengths and the increment in variance from new mutations. Although truncation selection produces negative linkage disequilibrium in infinite populations, simulation results show that the effects of linkage on response are more pronounced in finite populations. Substantial linkage disequilibrium at the DNA sequence level is being found in population surveys. Some of the results and their interpretation are discussed.

scholarly journals Metabolite profiling and quantitative genetics of natural variation for flavonoids in Arabidopsis

2012 ◽  
Vol 63 (10) ◽  
pp. 3749-3764 ◽  
Author(s):  
Jean-Marc Routaboul ◽  
Christian Dubos ◽  
Gilles Beck ◽  
Catherine Marquis ◽  
Przemyslaw Bidzinski ◽  
...  
Keyword(s):  
Quantitative Genetics ◽  
Metabolite Profiling ◽  
Natural Variation

scholarly journals Distribution, status and conservation of a Critically Endangered, extremely narrow endemic: Lamyropsis microcephala (Asteraceae) in Sardinia

Oryx ◽  
2011 ◽  
Vol 45 (2) ◽  
pp. 180-186 ◽  
Author(s):  
Giuseppe Fenu ◽  
Efisio Mattana ◽  
Gianluigi Bacchetta
Keyword(s):  
Population Size ◽  
Conservation Status ◽  
Integrated Approach ◽  
Critically Endangered ◽  
Ex Situ ◽  
Endemic Plant ◽  
Critically Endangered Species ◽  
Narrow Endemic ◽  
Conservation Measures ◽  
Endangered Status

AbstractThe aims of this work were to verify the distribution and population size of Lamyropsis microcephala (Asteraceae), characterize its habitat, assess its conservation status and initiate conservation measures for this Critically Endangered species. Distribution was determined by field surveys and mapping. To estimate population size and density 81 permanent monitoring plots were randomly established. Ex situ conservation measures were activated by harvesting and appropriate storage of seed. We confirmed the presence of L. microcephala at two previously known sites and found it in two previously unknown localities. The areas in which the species occur vary from 200 to 240,000 m2, at altitudes of 1,450–1,820 m, on slopes of 15–45° with aspects from north to west. The estimated number of ramets per population varied from c. 2,000 to c. 2,000,000, with a mean density of 8.29 ± SD 14.3 to 10.33 ± SD 10.05 ramets m-2. Our findings confirmed the Critically Endangered status of this species, although with different criteria. This study is an example of an integrated approach for the conservation of an extremely narrow endemic plant species and may be useful for other little-known threatened species for which urgent conservation measures are needed.

scholarly journals Conservation status of the narrow endemic gypsophile Ononis tridentata subsp. crassifolia in southern Spain: effects of habitat disturbance

Oryx ◽  
2013 ◽  
Vol 47 (2) ◽  
pp. 199-202 ◽  
Author(s):  
Miguel Ballesteros ◽  
Ana Foronda ◽  
Eva María Cañadas ◽  
Julio Peñas ◽  
Juan Lorite
Keyword(s):  
Population Size ◽  
Seedling Recruitment ◽  
Conservation Status ◽  
Iucn Red List ◽  
Endemic Plant ◽  
Negative Effects ◽  
Field Surveys ◽  
Narrow Endemic ◽  
Area Of Occupancy ◽  
Species Area

AbstractOnonis tridentata L. subsp. crassifolia (Leguminosae) is a narrow endemic plant restricted to gypsum outcrops in south-east Spain. Its habitat and populations are currently threatened by anthropogenic disturbance. Because of the paucity of information concerning its distribution, abundance and response to disturbance, we assessed its status and evaluated the impacts of quarrying, ploughing, grazing and afforestation. Distribution and population size were estimated by field surveys, censuses and mapping. We measured cover, plant volume, fruit and seed production, seed predation and seedling recruitment to asses any effects of disturbance. The species’ area of occupancy is 1.6 km2 and its extent of occurrence 337 km2, in 29 habitat patches and 16 populations between 705 and 1,125 m altitude, and its population size was estimated to be 531,605. Quarrying, ploughing, overgrazing and afforestation negatively affected the species, in this order. We recommend this subspecies be categorized as Vulnerable on the IUCN Red List. A species recovery plan is required, and the ecological restoration of altered areas would mitigate negative effects on the species and improve the overall conservation of gypsum habitats.

scholarly journals Marker-Assisted Breeding as Next-Generation Strategy for Genetic Improvement of Productivity and Quality: Can It Be Realized in Cotton?

2011 ◽  
Vol 2011 ◽  
pp. 1-16 ◽  
Author(s):  
N. Manikanda Boopathi ◽  
K. Thiyagu ◽  
B. Urbi ◽  
M. Santhoshkumar ◽  
A. Gopikrishnan ◽  
...  
Keyword(s):  
Genetic Engineering ◽  
Quantitative Genetics ◽  
Genetic Improvement ◽  
Natural Variation ◽  
Breeding Program ◽  
Marker Assisted Breeding ◽  
Conventional Breeding ◽  
Complete Knowledge

The dawdling development in genetic improvement of cotton with conventional breeding program is chiefly due to lack of complete knowledge on and precise manipulation of fiber productivity and quality. Naturally available cotton continues to be a resource for the upcoming breeding program, and contemporary technologies to exploit the available natural variation are outlined in this paper for further improvement of fiber. Particularly emphasis is given to application, obstacles, and perspectives of marker-assisted breeding since it appears to be more promising in manipulating novel genes that are available in the cotton germplasm. Deployment of system quantitative genetics in marker-assisted breeding program would be essential to realize its role in cotton. At the same time, role of genetic engineering and in vitro mutagenesis cannot be ruled out in genetic improvement of cotton.

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