TITLE

Additive and non-additive genetic architecture of two different-sized populations of Scabiosa canescens

AUTHOR(S)

Waldmann, Patrik

PUB. DATE

June 2001

SOURCE

Heredity;Jun2001, Vol. 86 Issue 6, p648

SOURCE TYPE

Academic Journal

DOC. TYPE

Article

ABSTRACT

Future adaptation to changes in the environment depends on the existence of additive genetic variances within populations. Recently, considerable attention has also been given to the non-additive component, which plays an important role in inbreeding depression and bottleneck situations. In this study, I used data from a North Carolina II crossing experiment, analysed with restricted maximum-likelihood methods, to estimate the additive and dominance genetic (co)variances for eight quantitative characters in two different-sized populations of Scabiosa canescens, a rare and threatened plant in Sweden. There was no evidence for genetic erosion in the small H�llestad population (�25 individuals) relative to the large �hus population (�5000 individuals). In fact, slightly higher heritabilities were found in the H�llestad population. The additive genetic variance was statistically significant for all traits in both populations, but only a few additive covariances reached significance. The H�llestad population also had higher mean levels and more traits with significant dominance variance than the �hus population. The variance attributable to maternal effects was too low to be considered significant. There was only a weak correspondence between heritabilities for each trait in the present study and previous estimates based on open-pollinated families of the same populations, but the mean heritability (over characters) was consistent between the studies.

ACCESSION #

5532544

Tags: RARE plants;  PLANT populations;  GENETICS

 

Related Articles

• Using phylogenetic, genetic and demographic evidence for setting conservation priorities for Mexican rare pines. Delgado, Patricia; Eguiarte, Lu�s Enrique; Molina-Freaner, Francisco; Alvarez-Buylla, Elena R.; Pi�ero, Daniel // Biodiversity & Conservation;Jan2008, Vol. 17 Issue 1, p121 

  Phylogenetic, genetic and demographic information are key issues for establishing priorities for conservation. In this study we explored the Vane-Wrigth measure of phylogenetic diversity for establishing criteria for conservation, when intra as well as interpopulation level demographic...

• Genetic differentiation in an artificial population of the threatened plant Lupinus oreganus (Fabaceae)1. Severns, Paul M. // Botany;May2013, Vol. 91 Issue 5, p319 

  Reintroduction, supplemental planting for genetic rescue, and the creation of artificial seed production populations are common methods to conserve rare plant species, but empirical studies assessing the effects of artificial selection on genetic diversity are rare. I conducted a retrospective...

• Genetic structure and systematic relationships within the Ophrys fuciflora aggregate (Orchidaceae: Orchidinae): high diversity in Kent and a wind-induced discontinuity bisecting the Adriatic. Devey, Dion S.; Bateman, Richard M.; Fay, Michael F.; Hawkins, Julie A. // Annals of Botany;Aug2009, Vol. 104 Issue 3, p483 

  Background and Aims: A recent phylogenetic study based on multiple datasets is used as the framework for a more detailed examination of one of the ten molecularly circumscribed groups identified, the Ophrys fuciflora aggregate. The group is highly morphologically variable, prone to phenotypic...

• Defining plant functional groups to guide rare plant management. Franks, Andrew J.; Yates, Colin J.; Hobbs, Richard J. // Plant Ecology;Oct2009, Vol. 204 Issue 2, p207 

  To effectively manage plant populations for conservation, there is a need to provide reliable information on the conditions required for maintaining viable populations. This is particularly true for the management of populations of rare plant taxa. Western Australia contains over 45% of...

• First, Acquire Knowledge. Pollack, Cathy // Endangered Species Update;Apr-Jun2006, Vol. 23 Issue 2, p28 

  The article focuses on the threatened species of the eastern prairie fringed orchid due to habitat loss as listed by the U.S. Fish and Wildlife Service in 1989. In 1999, a recovery plan was initiated which includes site protection, habitat management, seed introduction and augmentation, and...

• Population dynamics of the symbiotic mushroom Hebeloma cylindrosporum: mycelial persistence and inbreeding. Gryta, Herve; Debaud, Jean-Claude; Marmeisse, Roland // Heredity;Mar2000, Vol. 84 Issue 3, p294 

  The pattern of colonization of a forest site by the ectomycorrhizal basidiomycete fungus Hebeloma cylindrosporum Romagnesi was followed from 1993 until 1997. Fruit-bodies of this tetrapolar heterothallic species were mapped, collected and propagated as pure mycelial cultures. Isolates were...

• Size-class differences in genetic structure and individual distribution of Camellia japonica L. in a Japanese old grown evergreen forest. Ueno, S.; Tomaro, N.; Yoshimaru, H.; Manabe, T.; Yamamoto, S. // Heredity;Aug2002, Vol. 89 Issue 2, p120 

  Studies size-class differences in genetic structure and individual distribution of Camellia japonica in an old-growth evergreen forest in Japan. Dispersion patterns; Allele frequencies among size-classes; Spatial genetic structure resulting from limited seed dispersal.

• Cypripediurn cakeolus -- reasons for rarity, and reintroduction.  // Orchid Review;Sep2012, Vol. 120 Issue 1299, p135 

  The article focuses on the results of recent DNA studies conducted by a team of geneticists at the Royal Botanic Gardens in Kew, England and from the University of Copenhagen in Denmark which unveiled the low genetic variation in isolated populations of Cypripedium calceolus.

• Genealogical structure among alleles regulating self-incompatibility in natural... Uyenoyama, Marcy K.; Clark, A.G. // Genetics;Nov97, Vol. 147 Issue 3, p1389 

  Opinion. Discusse the genealogical structure among alleles in natural populations of flowering plants. Proposal of method; How were expected distributions of ratios generated; Appearance of distributions; Indication of compared observed indices to expected distributions generated by numerical...

Read the Article