Predicted gains from Sitka spruce parents of families (family mixtures)

Parents of families

These are special seed lots (or in some cases plants) which have been supplied to the GB Forestry Commission (FC) and private nurseries since 1981. They have been used for commercial vegetative propagation and also for purely research applications.

They are either half-sibling (polycross) or full-sibling (specific cross) mixtures of seed from parents of proven superiority over direct import Queen Charlotte Islands, British Columbia, Canada (QCI) material for growth and quality traits. The seed has been produced using controlled pollination techniques between parents selected by the former Genetics Branch (now part of Centre for Forest Resources and Management) of Forest Research.

See 50 years of Tree Breeding.

Identity numbers

Until recently the identity numbers of seed lots looked like this e.g. SS82(M0012). They now look like this e.g. psi04(PF86TE), due to changes brought in under the Forest Reproductive Material Regulations (2002) (FRM), which came into force in Britain in January 2003:

Commercial family mixtures from 1990 - 2011

The table below shows the identity numbers of the commercial parents of families seed sold by Forest Research between 1990 and 2011, along with details of their predicted improvements in performance over direct import QCI material. Where both families of a full-sib cross are of QCI origin this is stated. All half-sib material is of mixed or unknown origin and is listed as M/U.

Sitka spruce commercial family mixtures from 1990 - 2011
FRM Identity Number Predicted percentage gain over QCI H or F sib Origin
Diameter Density Straightness Branching
psiPF25TE 19 - 5 - H M/U
psiPF30TE 20 - 6 - H M/U
psiPF34TE 20 - 11 - H M/U
psiPF37TE 21 - 11 - H M/U
psiPF38TE 20 - 10 - H M/U
psiPF43TE 22 - 10 - H M/U
psiPF44TE 20 - 10 - H M/U
psiPF46TE 22 - 9 - H M/U
psiPF47TE 20 - 10 - H M/U
psiPF49TE 16 - 15 - H M/U
psiPF51TE 22 - 15 - H M/U
psiPF52TE 22 -3 17 - H M/U
psiPF53TE 22 -3 17 - H M/U
psiPF54TE 18 -2 20 - H M/U
psiPF55TE 22 -2 18 - H M/U
psiPF56TE 22 -2 18 - H M/U
psiPF57TE 18 -1 20 - H M/U
psiPF58TE 22 0 18 - H M/U
psiPF59TE 22 0 17 - H M/U
psiPF60TE 19 4 12 - H M/U
psiPF61TE 16 5 17 - H M/U
psiPF62TE 19 5 12 - H M/U
psiPF63TE 22 0 18 - H M/U
psiPF64TE 16 5 17 - H M/U
psiPF65TE 14 2 29 - F M/U
psiPF66TE 17 -1 11 - F M/U
psiPF67TE 5 9 15 - F Q.C.I.
psiPF68TE 22 -1 18 - H M/U
psiPF69TE 24 -12 25 15 F M/U
psiPF70TE 10 10 15 - H M/U
psiPF71TE 10 10 15 - H M/U
psiPF72TE 17 3 20 - H M/U
psiPF73TE 17 3 20 - H M/U
psiPF74TE 21 0 20 - H M/U
psiPF75TE 24 -12 25 15 F M/U
psiPF76TE 19 5 14 - H M/U
psiPF77TE 21 0 20 - H M/U
psiPF78TE 21 0 19 - H M/U
psiPF79TE 4 12 15 6 F M/U
psiPF80TE 18 0 31 14 F M/U
psiPF81TE 14 4 20 10 F Q.C.I.
psiPF82TE 19 2 12 9 F M/U
psiPF83TE 11 8 17 12 F Q.C.I.
psiPF84TE 7 8 12 18 F Q.C.I.
psiPF85TE 20 1 19 - H M/U
psiPF86TE 24 -12 25 15 F M/U
psiPF87TE 23 -6 16 16 F M/U
psiPF88TE 11 8 17 12 F Q.C.I.
psiPF89TE 16 -2 11 - F M/U
psiPF90TE 13 3 4 - F M/U
psiPF91TE 25 -14 10 - F M/U
psiPF92TE 14 4 20 10 F Q.C.I.
psiPF93TE 19 2 12 9 F M/U
psiPF94TE 23 -6 16 16 F M/U
psiPF95TE 18 -10 21 14 F M/U
psiPF96TE 31 -19 21 5 F M/U
psiPF97TE 33 -15 15 8 F M/U
psiPF98TE 24 4 12 6 F Q.C.I.
psiPF99TE 13 2 13 17 F Q.C.I.
psiPF100TE 16 -2 16 18 F Q.C.I.
psiPF103TE 21 -8 30 16 F M/U
psiPF105TE 20 -8 35 18 F M/U
psiPF106TE 17 1 24 2 F M/U

'-' indicates not available at time of issue.

Notes:

  • Family mixtures identified as ‘H’ (half-sib) were not assessed for branching quality as a separate characteristic, but branching quality was included as part of the straightness assessment, often referred to as ‘Stem Form’.
  • Most full-sib families (F) are assessed for straightness and branching as separate characteristics.

Further information

See also Predicted gains from Sitka spruce seed orchards.

For general information on family mixtures please contact Steve Lee.
Email: steve.lee@forestry.gsi.gov.uk