2Schweitzer J A, Martinsen G D, Whitman T G. Cottonwood hybrids gain fitness traits of both parents: a mechanism for their long-term persistence? [J]. American Journal of Botany, 2002, 89(6) : 981 - 990.
3Zalesny R S, Riemenschneider D E, Hall R B. Early rooting of dor- mancy hardwood cuttings of Populus : analysis of quantitative genetics and genotype × environment interactions[ J ]. Can J For Res, 2005, 35 : 918 - 929.
4Arora R, Rowland L J, Tanino K. Induction and release of bud dor- mancy in wood perennials : a science comes of age[ J]. HortScience, 2003. 38(5) : 911 -921.
5Kalcsits L, Kendall E, Silim S,et al. Magnetic resonance microim- aging indicates water diffusion correlates with dormancy induction in cultured hybrid poplar (Populus spp. ) buds [ J ]. Tree Physiology, 2009, 29 : 1269 - 1277.
6Ibanez C, Kozarewa I, Johansson M,et al. Circadian clock compo- nents regulate entry and affect exit of seasonal dormancy as well as winter hardiness in Populus trees [ J ]. Plant Physiology August, 2010, 153:1823-1833.
7Luo M, Dennis E S, Berger F, et al. Miniseed3 ( mini3 ), a WRKY family gene, and HAIKU2 ( IKU2 ), a leucine-rich repeat (LRR) kinase gene, are regulators of seed size in Arabidopsis[ J]. PNAS, 2005, 102(48): 17531-17536.