Table 1 Summary table with population size and coancestry parameters across groups (founders, seed orchard seedlots by year of collection and progeny trial trees) in the G1 white spruce orchard, using tree genomic profiles with a set of 2000 SNPs.

From: SNP-based analysis reveals unexpected features of genetic diversity, parental contributions and pollen contamination in a white spruce breeding program

 

Groups

Founders

2003 seedlot

2005 seedlot

2007 seedlot

2009 seedlot

2018 seedlot

Progeny trials**

Parameter

N (number of genotypes)

151

151

151

151

151

53

151

Ne (using number of cones*)

n/a

48.6

35.3

51.4

46

18

n/a

Ne (using genomic profiles)

500

166

59

158

96

12

31

Nratio

3.3

1.1

0.4

1.0

0.6

0.2

0.2

Ɵ

0.001

0.003

0.008

0.003

0.005

0.040

0.016

Relatedness level

Unrelated (%)

67.2

74.4

73.8

74.8

74.2

52.4

76.5

2nd cousins (%)

31.5

18.8

13.3

17.0

16.4

8.7

11.7

1st cousins (%)

1.3

0.6

1.1

0.8

0.8

4.0

1.0

Half-sibs (%)

0.0

5.9

10.9

7.2

8.0

32.4

10.2

Full-sibs (%)

0.0

0.3

1.0

0.3

0.5

2.5

0.6

  1. N is the number of genotypes present in the clonal seed orchard (actual population size). Effective population size (Ne) was calculated by two methods: using numbers of cones per genotype and SNP profiling (see Methods). Nratio is Ne(genomic profiles)/N. Coancestry coefficient (Ɵ) was disaggregated to calculate relatedness levels (%) for each group.
  2. *These values were calculated following FGRMS (2016).
  3. **Relatedness levels for progeny trials were calculated among families.
Back to article page