Mating structure and inbreeding and outbreeding depression in the rare plant Gentianella germanica (Gentianaceae)

1997 ◽  
Vol 84 (12) ◽  
pp. 1685-1692 ◽  
Author(s):  
Markus Fischer ◽  
Diethart Matthies
Keyword(s):  
Outbreeding Depression ◽  
Rare Plant ◽  
Mating Structure ◽  
Gentianella Germanica

The authorship of Plantae rariores agro Dunelmensi indigenae

1981 ◽  
Vol 10 (2) ◽  
pp. 335-340 ◽  
Author(s):  
P. S. DAVIS ◽  
G. G. GRAHAM
Keyword(s):  
Rare Plant ◽  
Short List ◽  
Critical List ◽  
Local Plants

Stephen Robson (1741–1779) and his nephew Edward Robson (1763–1813) were both Quaker botanists who lived in Darlington, County Durham. Stephen is best known for his British Flora published in 1777, and Edward had a considerable reputation as a particularly competent botanist. Some confusion seems to exist regarding the authorship of a rare plant list for Durham, Plantae rariores agro Dunelmensi indigenae, attributed to Stephen Robson in most recent bibliographical literature. This paper re-examines the evidence for the authorship of this list and suggests that although Stephen Robson produced a short list of local plants the longer and more critical list, Plantae rariores … was compiled by his more knowledgeable nephew Edward.

Using Long-Term Population Monitoring Data to Prioritize Conservation Action among Rare Plant Species

2019 ◽  
Vol 39 (2) ◽  
pp. 169 ◽  
Author(s):  
Holly L. Bernardo ◽  
Pati Vitt ◽  
Rachel Goad ◽  
Susanne Masi ◽  
Tiffany M. Knight
Keyword(s):  
Plant Species ◽  
Population Monitoring ◽  
Monitoring Data ◽  
Rare Plant ◽  
Conservation Action ◽  
Rare Plant Species

Silene lulakabadensis (Caryophyllaceae), a New Species from Iran

2020 ◽  
Vol 28 (1) ◽  
pp. 24-28
Author(s):  
Mahnaz Heidari Rikan ◽  
Farrokh Ghahremaninejad ◽  
Mostafa Assadi
Keyword(s):  
New Species ◽  
Conservation Status ◽  
Green Plant ◽  
Critically Endangered ◽  
Rare Plant ◽  
Soil Slopes ◽  
Dark Green ◽  
A New Species

Silene lulakabadensis Heidari, F. Ghahrem. & Assadi is described as a new species from Zanjan Province, Iran. The new species is a dark green plant, perennial and woody at the base, that was collected on marl soil slopes at 2100 m. It is believed to be closely related to S. eriocalycina Boiss. from section Auriculatae (Boiss.) Schischk. but is a smaller plant, with much shorter internodes, and pinkish-white retuse to emarginate petals with very small or no scales. It is a very rare plant and its conservation status is assessed as Critically Endangered.

Modified rescue and risk expectations for species with diverse mating systems and modes of inheritance

2017 ◽  
Author(s):  
Richard Frankham ◽  
Jonathan D. Ballou ◽  
Katherine Ralls ◽  
Mark D. B. Eldridge ◽  
Michele R. Dudash ◽  
...  
Keyword(s):  
Mating Systems ◽  
Outbreeding Depression ◽  
Mixed Mating ◽  
Genetic Rescue ◽  
Mode Of Inheritance

The risks of inbreeding and outbreeding depression, and the prospects for genetic rescue are often different in species with alternative mating systems and mode of inheritance (compared to outbreeding diploids), such as self-incompatible, self-fertilizing, mixed mating, non-diploid (haploid, haplodiploid and polyploid) and asexual.

Outbreeding depression is uncommon and predictable

2017 ◽  
Author(s):  
Richard Frankham ◽  
Jonathan D. Ballou ◽  
Katherine Ralls ◽  
Mark D. B. Eldridge ◽  
Michele R. Dudash ◽  
...  
Keyword(s):  
Natural Selection ◽  
Genetic Differences ◽  
Outbreeding Depression ◽  
Isolated Populations ◽  
Large Populations

Crosses between populations within species sometimes result in reduced fitness, especially in F2 and later generations (outbreeding depression). The primary mechanisms causing outbreeding depression in crosses between populations are fixed chromosomal differences and adaptive genetic differences, especially for long-isolated populations. Outbreeding depression is usually observed after crossing populations with ploidy differences or fixed differences for translocations, inversions or centric fusions: the magnitudes are usually ploidy > translocations and monobrachial centric fusions > inversions and simple centric fusions. Populations adapted to different environments (but with the same karyotype) often exhibit outbreeding depression when crossed, especially in the F2 and later generations. Even if outbreeding depression occurs, it is often only temporary, as natural selection acts to remove it, especially in large populations.

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