Abstract
Self and cross families from three populations (A, low-density, ecologically marginal site for lodgepole pine, and B + C, normal sites) were cultured in a common outdoor nursery for 2 yrs. Previous results had shown higher natural selfing rates and lower inbreeding depression in embryo survival in A than in B + C. In the nursery test, selfing decreased means of size traits, retarded phenological development, increased variance among families within populations, increased the coefficient of within-family variance, and increased within-family skewness. The selfing depression of mean values was moderately less and the selfing inflation of within-plot variation was much less in A than in B + C. Results were compatible with the idea that the higher selfing rate in A had purged both severely deleterious alleles affecting embryo survival and severely deleterious alleles affecting later life-cycle traits related to plant size. Purging partially mitigated the genetic consequences associated with increased inbreeding in small populations, but even with purging, population A retained a large inbreeding depression in both embryonic and seedling traits.
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Claims 7
Claim · model-written summary
In the nursery test, selfing decreased the means of size traits in lodgepole pine seedlings relative to cross families.
- Taxon
- lodgepole pine
Pinus contortae0 - Treatment
- selfinge1
- Outcome
- means of size traitse1
- Direction
- decreasede1
- Comparator
- cross familiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Self and cross families from three populations (A, low-density, ecologically marginal site for lodgepole pine”
e1“selfing decreased means of size traits”
Claim · model-written summary
Selfing retarded phenological development in lodgepole pine seedlings relative to cross families.
- Taxon
- lodgepole pinePinus contortae0
- Treatment
- Selfe0
- Outcome
- phenological developmente1
- Direction
- retardede1
- Comparator
- cross familiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Self and cross families from three populations (A, low-density, ecologically marginal site for lodgepole pine”
e1“retarded phenological development”
Claim · model-written summary
Selfing increased variance among families within populations, the coefficient of within-family variance and within-family skewness in lodgepole pine.
- Taxon
- lodgepole pinePinus contortae0
- Treatment
- Selfe0
- Outcome
- variance among families within populations, increased the coefficient of within-family variance, and increased within-family skewnesse1
- Direction
- increasede1
- Comparator
- cross familiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Self and cross families from three populations (A, low-density, ecologically marginal site for lodgepole pine”
e1“increased variance among families within populations, increased the coefficient of within-family variance, and increased within-family skewness”
Claim · model-written summary
The selfing depression of mean values was moderately less in population A than in populations B + C.
- Taxon
- lodgepole pinePinus contortae0
- Treatment
- selfinge1
- Outcome
- selfing depression of mean valuese1
- Direction
- moderately lesse1
- Comparator
- B + Ce1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Self and cross families from three populations (A, low-density, ecologically marginal site for lodgepole pine”
e1“The selfing depression of mean values was moderately less and the selfing inflation of within-plot variation was much less in A than in B + C”
Claim · model-written summary
The selfing inflation of within-plot variation was much less in population A than in populations B + C.
- Taxon
- lodgepole pinePinus contortae0
- Treatment
- selfinge1
- Outcome
- selfing inflation of within-plot variatione1
- Direction
- much lesse1
- Comparator
- B + Ce1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Self and cross families from three populations (A, low-density, ecologically marginal site for lodgepole pine”
e1“The selfing depression of mean values was moderately less and the selfing inflation of within-plot variation was much less in A than in B + C”
Claim · model-written summary
The results were compatible with the idea that the higher selfing rate in population A had purged severely deleterious alleles affecting embryo survival and later life-cycle size traits.
- Taxon
- lodgepole pinePinus contortae0
- Treatment
- higher selfing rate in Ae1
- Outcome
- purged both severely deleterious alleles affecting embryo survivale1
- Qualifier
- Results were compatible with the ideae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Self and cross families from three populations (A, low-density, ecologically marginal site for lodgepole pine”
e1“Results were compatible with the idea that the higher selfing rate in A had purged both severely deleterious alleles affecting embryo survival and severely deleterious alleles affecting later life-cycle traits related to plant size”
Claim · model-written summary
Even with purging, population A retained a large inbreeding depression in both embryonic and seedling traits.
- Taxon
- lodgepole pinePinus contortae0
- Material
- population Ae1
- Outcome
- large inbreeding depression in both embryonic and seedling traitse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Self and cross families from three populations (A, low-density, ecologically marginal site for lodgepole pine”
e1“population A retained a large inbreeding depression in both embryonic and seedling traits”