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Cryptic Seed Orchard Dysfunctions

Cryptic Seed Orchard Dysfunctions. The case of Larix decidua x L. kaempferi. Results from Denmark. Danish Seed orchards in production (1947->). Hybrid superiority 25 years from planting, average of 2 sites. Design. Design. 2-5 clones L. decidua. 1 clone L. kaempferi. Design.

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Cryptic Seed Orchard Dysfunctions

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  1. Cryptic Seed Orchard Dysfunctions The case of Larix decidua x L. kaempferi Results from Denmark

  2. Danish Seed orchards in production (1947->)

  3. Hybrid superiority25 years from planting, average of 2 sites

  4. Design

  5. Design 2-5 clones L. decidua 1 clone L. kaempferi

  6. Design 2-15 clones or Full sib family or Selfed family L. Kaempferi 1 clone L. decidua

  7. Design Hybrids 2-15 clones or Full sib family or Selfed family L. Kaempferi Seed crop Selfed 1 clone L. decidua

  8. Test for hybrids • Allozymes • SSR markers • cpDNA ; mtDNA (Acheré et al. 2004)

  9. Test for hybrids • Allozymes • SSR markers • cpDNA ; mtDNA (Acheré et al. 2004) 601 481

  10. Hybrid larch ?

  11. Hybrids? FP 244

  12. Hybrids? FP 205 FP 244

  13. Hybrid superiority25 years from planting, average of 2 sites

  14. Hybrids? FP 205 FP 244

  15. Hybrids? + FP 618 FP 205 FP 244

  16. Hybrids? + FP 618 FP 205 FP 244

  17. Hybrids? + FP 618 FP 203 FP 205 FP 244

  18. Hybrids? + FP 618 FP 203 FP 205 FP 244

  19. Hybrids? + FP 618 FP 203 FP 205 FP 244

  20. Hybrids? + FP 618 FP 203 FP 205 FP 244

  21. Hybrids? + FP 618 FP 211 FP 237 FP 203 FP 201 FP 205 FP 244

  22. Hybrids? Hybrid % in a given Seed Orchards may vary substantially from year to year + FP 203 FP 244 FP 205

  23. Zygotic selectionWhats happends after sowing? • During germination • Growth in the nursery • Culling in the nursery before selling • Growth in the Forests after planting

  24. Zygotic selection - germination time Hybrid fraction according to germination interval FP205 (2004): Hybrid= 63%

  25. Hybrid percent Depends on the sampled germination window … - What is a suitable time window?

  26. Zygotic selection –In the Nursery upto Seedlings Plug+1 Bare roots 11% -> 11% 11% -> 11%

  27. Zygotic selection –In the Nursery upto Seedlings Bare roots 32% -> 45%

  28. Hybrid percent Depends on the applied nursery grading E.g. from 70% – 11% • What is a suitable culling regime? • Should all nurseries test before selling?

  29. Zygotic selection –In the Forest after 18 years

  30. Conclusion? • Important to know what’s going on in the CSOs • Test every seedlot • Need for minimum acceptable Hybrid% ? • Need for minimum acceptable culling? • Production technique?

  31. Involved staff Lars Nørgaard Hansen, UoC Erik Dahl Kjær, UoC Viggo Jensen, UoC Lotte Hougs, The Danish Plant Directorate Henrik Gade Knudsen, Thanks to The Danish Forest and Nature Agency for financial support

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