caa a22 4500 475794400 CHVBK 20180406123719.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/s001220051525 doi (NATIONALLICENCE)springer-10.1007/s001220051525 Quantitative genetics of bud phenology, frost damage, and winter survival in an F2 family of hybrid poplars [Elektronische Daten] [G. T. Howe, P. Saruul, J. Davis, T. H. H. Chen] Abstract : We studied the quantitative genetics of bud phenology, fall frost damage, and winter survival in an F2 family (no. 822) of Populus hybrids derived from a cross between two full-sub F1 hybrids (P. trichocarpa (Torr. & Gray×P. deltoides Bartr.). Field traits studied included the timing of bud set (BSF) in Minnesota and Oregon, the timing of bud flush (BFF) in Oregon, as well as fall frost damage (FDF) and winter survival (WSF) in Minnesota. We conclude that Family 822 has substantial genetic variability for all field traits, BSF and BFF are under moderate to strong genetic control (H 2 i =0.48-0.80), FDF and WSF are under low to moderate genetic control (H 2 i =0.27-0.40), and late bud set is associated with increased frost damage and decreased winter survival. In a warm greenhouse, we measured the timing of bud set and the number of new leaves on trees growing under either an 8-h photoperiod (BSSD and NLSD) or a natural photoperiod (NP) from August to December (BSNP and NLNP). We found that BSSD, NLSD, and NLNP are under moderate genetic control (H 2 i =0.53-0.70), but the heritability of BSNP could not be determined because few trees set bud in the warm greenhouse under the NP. By comparing results from the greenhouse experiments with results from the field, we conclude that the genetic correlation between BSSD and BSF (0.53-0.60) is relatively modest and that NPs in the fall are relatively ineffective at promoting bud set under warm greenhouse temperatures, although bud set readily occurred in the field. Although, low levels of light pollution in the greenhouse might have affected BSNP, results from both greenhouse and field experiments suggest that genetic differences in photoperiodic responses play a modest role in explaining genetic differences in the timing of bud set under natural field conditions. Therefore, genetic differences in responses to other environmental factors, such as temperature, deserve greater attention. Springer-Verlag Berlin Heidelberg, 2000 Key words Bud flush nationallicence Bud set nationallicence Frost hardiness nationallicence Photoperiod nationallicence Short day nationallicence Howe G. T. School of Natural Resources, The Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OH, 44691, USA e-mail: howe.62@osu.edu Fax: +1-330-263-3658, US aut Saruul P. Department of Plant Pathology, University of Minnesota, St. Paul, MN, 55108, USA, US aut Davis J. Department of Horticulture, Oregon State University, Corvallis, OR, 97331, USA, US aut Chen T. H. H. Department of Horticulture, Oregon State University, Corvallis, OR, 97331, USA, US aut https://doi.org/10.1007/s001220051525 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s001220051525 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Howe G. T. School of Natural Resources, The Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OH, 44691, USA e-mail: howe.62@osu.edu Fax: +1-330-263-3658, US aut NATIONALLICENCE 700 1- Saruul P. Department of Plant Pathology, University of Minnesota, St. Paul, MN, 55108, USA, US aut NATIONALLICENCE 700 1- Davis J. Department of Horticulture, Oregon State University, Corvallis, OR, 97331, USA, US aut NATIONALLICENCE 700 1- Chen T. H. H. Department of Horticulture, Oregon State University, Corvallis, OR, 97331, USA, US aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer