Table 1.
Elite aspen and hybrid clones and their characteristics.
| Original genotype | Putative species/hybrid identity | Origin | Description | Clones and clonal lineages obtained based on original genotypes |
|---|---|---|---|---|
| PtV22 | Putatively Populus tremula | Minsk Oblast, Belarus, breeding form obtained in Institute of Forest, National Academy of Belarus, Gomel, Belarus, provided by V. E. Padutov | Diploid green-bark aspen form. Characterized by fast growth and resistance to heart rot caused by pathogen fungus Phellinus tremula | Ptv22-1, Ptv22-2, Ptv22-3, 21mut, 2mut, 14mut, 4mut, 12mut |
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| Pt | P. tremula | Leningrad Oblast, Russia, breeding form obtained in St. Petersburg Research Institute for Forestry, provided by D. A. Shabunin | Diploid giant aspen form. Characterized by fast growth and resistance to heart rot caused by pathogen fungus Phellinus tremula | Pt2, Pt3 |
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| F2 | P. tremula | Kostroma Oblast, Russia, breeding form obtained by S. N. Bagayev, provided by D. A. Shabunin | Diploid female clone. Highly productive (plus 51% by sum of stem cross section squares and plus 43% by growing stock). Increased wood density of 475 kg/m3[11] | F2-1, F2-2, F2-3 |
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| 47 | P. tremula | Latvian State Forest Research Institute “Silava,” Latvia, provided by Dr. Arnis Gailis | Diploid aspen form. Productivity of 180–200 m3/haat age 12 under density of 1100 stems/ha. Characterized by resistance to heart rot caused by pathogen fungus Phellinus tremula [12] | 47-1, 47-1-1-31, 47-1-1-22, 47-1-2-27, 47-1-1-19, 47-1-2-53 |
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| С-control | P. tremuloides × P. tremula | -“- | Diploid hybrid form. Productivity of 180–200 m3/ha at age 12 under density of 1100 stems/ha [12] | С-1, С-2, С-3 |
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| 23 | P. tremuloides × P. tremula | -“- | Diploid hybrid form. Maximal productivity of 200–250 m3/ha demonstrated at age 12 under density of 1100 stems/ha [12]. High wood density | L23-1, L23-2, L23-3 |
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| 4 | P. tremuloides × P. tremula | -“- | Maximal productivity of 250–300 m3/ha demonstrated at age 12 under density of 2500 stems/ha [12] | L4-1, L4-2, L4-3 |
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| No. 3-understory | P. tremula | Republic of Tatarstan, breeding form by A. H. Gaziulllin, provided by N. R. Garipov | Triploid aspen form. Characterized by fast growth and resistance to heart rot caused by pathogen fungus Phellinus tremula | No. 3-understory-1 |