Relationship between inbreeding depression and inbreeding coefficient in maritime pine (Pinus pinaster)

The relationship between inbreeding depression and inbreeding coefficient (F) for several important traits was investigated in an 11-year trial of maritime pine (Pinus pinaster). Five levels of inbreeding (F=0; 0.125; 0.25; 0.5; 0.75) were obtained in a mating design involving ten plus-trees, or the...

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Bibliographic Details
Published in:Theoretical and applied genetics 1996-03, Vol.92 (3-4), p.347-356
Main Authors: Durel, C.E, Bertin, P, Kremer, A. (Institut National de Recherches Agronomiques, Recherches Forestieres de Bordeaux, Pierroton (France). Lab. de Genetique et Amelioration des Arbres Forestiers)
Format: Article
Language:English
Subjects:
Biological and medical sciences
Classical genetics, quantitative genetics, hybrids
CRECIMIENTO
CROISSANCE
ENDOGAMIA
Fundamental and applied biological sciences. Psychology
Genetics
Genetics of eukaryotes. Biological and molecular evolution
GROWTH
HINCHAMIENTO DE LA SEMILLA
INBREEDING
Life Sciences
PINUS PINASTER
Pteridophyta, spermatophyta
REMPLISSAGE DU GRAIN
SEED FILLING
Vegetals
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Summary:The relationship between inbreeding depression and inbreeding coefficient (F) for several important traits was investigated in an 11-year trial of maritime pine (Pinus pinaster). Five levels of inbreeding (F=0; 0.125; 0.25; 0.5; 0.75) were obtained in a mating design involving ten plus-trees, or their progenies, as parents (total of 51 families). For F=0.75, the mean inbreeding depressions were 27% for height, 37% for circumference at breast height (63% for bole volume), 23% for basal straightness (better straightness of the inbred trees), and 89% for female fertility (number of cones). Large differences were observed among inbred families for the same level of inbreeding. The evolution of depression with F was more or less linear, depending on the traits. Significant differences among F-levels appeared very early for height (from 5-years of age). Inbreeding depression was much more expressed during unfavorable years than during favorable years for yearly height growth. When compared with other Pinus species, maritime pine appears to be less affected by inbreeding, especially for the percentage of filled seeds and general vigor. A reduced genetic load in maritime pine may result from the evolutionary history of the species and its scattered distribution.
ISSN:0040-5752
1432-2242
DOI:10.1007/bf00223678