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Seed set for Scots pine clones is difficult to predict

Seed set for Scots pine clones is difficult to predict. Dag Lindgren 1 Yordan Tellalov 2 and Finnvid Prescher 3 1Department of Forest Genetics and Plant Physiology Swedish University of Agricultural Sciences

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Seed set for Scots pine clones is difficult to predict

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  1. Seed set for Scots pine clones is difficult to predict Dag Lindgren1 Yordan Tellalov2 and Finnvid Prescher31Department of Forest Genetics and Plant Physiology Swedish University of Agricultural Sciences SE-901 83,Umeå, SwedenEmail: Dag.Lindgren@genfys.slu.se2 Department of Dendrology and Forest Tree BreedingThe Czech University of Agricultural Sciences165 21 Prague, Czechia3 Svenska Skogsplantor AB, Seed production, SE-340 14 Lagan, Sweden Main problem: Can clones be selected based on predictions of seed set ability? Reply: No Predictions based on observations in a clone bank and plus trees in forest was compared with performance in seed orchards.

  2. Umeå Plus trees The study concerns plus trees from the four northernmost counties (BD, AC, Z and Y). The first batch of plus trees were selected in natural mature forests 1950-1969 and grafted at Umeå (Sävar). Cone set of the plus trees was usually commented. Figure based on SkogForsk photo Figure based on a SkogForsk figure The plus tree W 4009 is the reproductively most successful tree in Sweden and perhaps Europe. It has currently about 70 million offspring in Swedish forests Sweden with current pine seed orchard zones color-coded .

  3. Clone bank (clone archive) Sävar (close to Umeå). Established 1969-1970 748 clones. 4 grafts per clone in rows. 555 grafts/ha Cone-set on each ramet was registered 1984. A purpose was to avoid bad cone-producers for seed orchards Photo: Yordan Tellalov Photo: Yordan Tellalov The clone bank 2006 How it may have looked 1984

  4. Seed set by clone of northern plus trees was estimated on mature grafts in 7 objects 4 seed orchards – Skaholma, Robertsfors, Klocke and Sävar SO A clone experiment on three localities – Röskär, Degeberga and Sävar The seed orchard Skaholma, one of the objects where the seed set per clone was estimated. Photo Dag Lindgren

  5. Objects where estimates of the same clones exist

  6. Correlation = 0,216 Slope = 0,428 Correlation = 0,059 Slope = 1,649 Correlation = 0,213 Slope = -0,454 Correlation = 0,344 Slope = 7,168 Clone bank vs seed orchards.

  7. Correlation = 0,437 Slope = -0,056 Correlation = 0,047 Slope = -0,012 Correlation = 0,287 Slope = 0,053 Correlation = 0,004 Slope = -0,001 Correlation = 0,097 Slope = 0,009 Clone bank - clone trial.

  8. Correlation = 0,129 Slope = -15,635 Correlation = 0,011 Slope = -9,036 Correlation = 0,104 Slope = -43,146 Correlation = 0,135 Slope = -11,068 Plus-trees - seed orchards.

  9. Correlation = 0,376 Slope = 7,738 Correlation = 0,101 Slope = -1,265 Correlation = 0,578 Slope = 7,172 Correlation = 0,476 Slope = 3,082 Correlation = 0,454 Slope = -3,918 Plus trees - clone trial.

  10. Average correlations was close to zero. Genetic gain in seed set was predicted by raising cone-set one standard deviation in clone bank or among plus trees. The gain was negative, or at least not large. The main results are based on observations in Scots pine in northern Sweden a single year in a young clone bank. More data would be desirable for generalization.

  11. Suggested Main Results • No single significant relationship. The correlations seem low. • The gain in seed production if clones are selected for cone-set is uncertain and seems quite low. • This study does not support to make efforts to predict seed-set before placing clones in seed orchards.

  12. This study is based on an undergraduate diploma work: Tellalov, Yordan (2006) Relative female reproductive output of grafted Scots pine (Pinus sylvestris) clones planted on different places. http://ex-epsilon.slu.se/archive/00001031/ More extensive acknowledgements are found there. Dag Lindgren was supervisor. Much of the data were collected and compiled for the planned PhD thesis of Finnvid Prescher.

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