[ADLER, P. R., S. J. DEL GROSSO and W. J. PARTON (2007): Life-cycle assessment of net greenhouse-gas flux for bioenergy cropping systems. Ecol Applic 17: 675-691.10.1890/05-201817494388]Search in Google Scholar
[BAUMEISTER, G. (1980): Beispiele der Polyploidie-Züchtung. AFZ 26: 340-343.]Search in Google Scholar
[BRADSHAW, H. D. and R. F. STETTLER (1993): Molecular genetics of growth and development in Populus. I. Triploidy in hybrid poplars. Theor Appl Genet 86: 301-307.10.1007/BF0022209224193473]Search in Google Scholar
[BRETAGNOLLE, F. and J. D. THOMPSON (1995): Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autoploid plants. New Phytol 129: 1-22.10.1111/j.1469-8137.1995.tb03005.x33874422]Search in Google Scholar
[CAI, X. and X.Y. KANG (2011): In vitro tetraploid induction from leaf explants of Populus pseudo-simonii Kitag. Plant Cell Rep 30: 1771-1778.10.1007/s00299-011-1085-z21750904]Search in Google Scholar
[DE LA TORRE UGARTE, D. G., M. E. WALSH, H. SHAPOURI and S. P. SLINSKY (2003): The economic impacts of bioenergy crop production on U.S. agriculture. U.S.D.A. Office of Chief Economist, Office of Energy Policy and New Uses. Rpt. No. 816, 41p.]Search in Google Scholar
[DE STORME, N. and D. GEELEN (2011): The Arabidopsis mutant Jason produces unreduced First Division Restitution male gametes through a parallel/fused spindle mechanism in Meiosis II. Plant Physiol 155: 1403-1415.10.1104/pp.110.170415304659421257792]Search in Google Scholar
[DEWITTE, A., K. VAN LAERE and J. VAN HUYLENBROECK (2012): Use of 2n Gametes in Plant Breeding. pp. 59-86. In: Plant Breeding, edited by I.Y. ABDURAKHMONOV, www.intechopen.com.10.5772/29827]Search in Google Scholar
[ECKENWALDER, J. E. (1996): Systematics and evolution of Populus. pp. 7-32. In: Biology of Populus and its implications for management and conservation, edited by R. F. STETTLER, H. D. BRADSHAW JR., P. E. HEILMANN and T. M. HINCKLEY, NRC Research Press, National Research Council of Canada, Ottawa.]Search in Google Scholar
[EINSPAHR, D.W., J. P. VAN BUIJTENEN and J. R. PECKHAM (1963): Natural variation and heritability in triploid aspen. Silvae Genet. 12: 51-58.]Search in Google Scholar
[EINSPAHR, D.W. and L. L. WINTON (1976): Genetics of quaking aspen. Aspen Bibliography, Paper 5026. http://digitalcommons.Usu.edu/aspen_bib/5026.]Search in Google Scholar
[EINSPAHR, D.W. (1984): Production and utilisation of triploid hybrid aspen. Iowa State J. Res. 58: 401-409.]Search in Google Scholar
[EVERY, D. A. and D. WIENS (1971): Triploidy in Utah aspen. Madrono: 138-47.]Search in Google Scholar
[EWALD, D., K. ULRICH, G. NAUJOKS and M. B. SCHRÖDER (2009): Induction of tetraploid poplar and black locust plants using colchicine: chloroplast number as an early marker for selecting polyploids in vitro. Plant Cell Tiss Organ Cult 99: 353-357.10.1007/s11240-009-9601-3]Search in Google Scholar
[EWALD, D. and K. ULRICH (2012): In vitro pollination in poplar of section Populus. Plant Cell Tiss Organ Cult 111: 255-258.10.1007/s11240-012-0189-7]Search in Google Scholar
[HARLAN, J. R. and J. M. J. DE WET (1975): On Ö. Winge and a prayer: The origins of polyploidy. Bot Rev 41: 361-390.10.1007/BF02860830]Search in Google Scholar
[HARTMANN, H. T., D. E. KESTER, F. T. DAVIES JR. and R. L. GENEVE (2002): Hartmann and Kester’s plant propagation: principles and practices. 7th ed. Pearson education, New Jersey. ISBN 0-13-679235-9.]Search in Google Scholar
[HEILBORN, O. (1934): On the origins and preservation of polyploidy. Hereditas 19: 233-242.10.1111/j.1601-5223.1934.tb02624.x]Search in Google Scholar
[HERRMANN, S. (1976): Verfahren zur Konservierung und Erhaltung der Befruchtungsfähigkeit von Waldbaumpollen über mehrere Jahre. Silvae Genet 25: 223-229.]Search in Google Scholar
[JANSSEN, A., S. FEHRENZ, C. FEY-WAGNER and W. HÜLLER (2012): Züchtung von Schwarz- und Balsampappeln für en Kurzumtrieb, pp. 33-54. In: Züchtung und Ertragsleistung schnell wachsender Baumarten im Kurzumtrieb. Beiträge aus der Nordwestdeutschen Forstlichen Versuchsanstalt, Universitätsverlag Göttingen.]Search in Google Scholar
[JOHNSSON, H. and C. EKLUNDH (1940): Colchicine treatment as a method in breeding hardwood species. Svensk Papp Tidn 43: 373-377.]Search in Google Scholar
[KANG, X.Y. and Z. T. ZHU (1997): A study on the 2n pollen vitality and germinant characteristics of white populus. Acta Bot Yunnanica 19: 402-406.]Search in Google Scholar
[KANG, X.Y., Z. T. ZHU and H. B. LIN (1999): Study on the effective treating period for pollen chromosome doubling of P. tomentosa x P. bolleana. Sci Silvae Sin 35: 21-24.]Search in Google Scholar
[KANG, X.Y., Z. T. ZHU and H. B. LIN (2000): Radiosensitivity of different ploidy pollen in poplar and its application. Acta Genet Sinica 27: 78-82.]Search in Google Scholar
[KANG, X.Y., Z. T. ZHU and Z.Y. ZHANG (2000a): Suitable period of high temperature treatment for 2n pollen of Populus tomentosa x P. bolleana. J Beijing For Univ 22: 1-4.]Search in Google Scholar
[KANG, X.Y. (2002): Mechanism of 2n pollen occurring in Chinese white poplar. J Beijing For Univ 24: 67-70.]Search in Google Scholar
[KANG, X.Y., J. ZHANG, P. D. ZHANG and Y. H. LI (2006): Induction of triploids in white poplar, pp. 71. In: International Poplar Symposium IV, Nanjing.]Search in Google Scholar
[KUNAKH, V. A., V. I. ADONIN, S. P. OZHEREDOV and Y. B. BLYUM (2008): Mixoploidy in wild and cultivated species of Cruciferae capable of hybridizing with rapeseed Brassica napus. Cytol Genet 42: 204-209.10.3103/S0095452708030079]Search in Google Scholar
[LI, Y. H., X.Y. KANG, S. D. WANG, Z. H. ZHANG and H.W. CHEN (2008): Triploid induction in Populus alba x P. glandulosa by chromosome doubling of female gametes. Silvae Genet 57: 37-40.10.1515/sg-2008-0006]Search in Google Scholar
[LIESEBACH, H., G. NAUJOKS and D. EWALD (2011): Successful hybridisation of hybrid aspen (Populus tremula x P. tremuloides) and eastern cottonwood (P. deltoides). Sex Plant Reprod 24: 189-198.10.1007/s00497-010-0156-621107610]Search in Google Scholar
[LINSMAIER, E. M. and F. SKOOG (1965) Organic growth factor requirements of tobacco tissue culture. Plant Physiol 21: 487-492.10.1111/j.1399-3054.1965.tb06874.x]Search in Google Scholar
[LIU, G., Z. LI and M. BAO (2007): Colchicine-induced chromosome doubling in Platanus acerifolia and its effect on plant morphology. Euphytica 157: 145-154.10.1007/s10681-007-9406-6]Search in Google Scholar
[MASHKINA, O. S., I. M. BURDAEVA, M. M. BELOZEROVA and L. N. V’YUNOVA (1989) A method of inducing diploid pollen in woody species. Lesovedenie 1: 19-25.]Search in Google Scholar
[MOCK, K. E., C. M. CALLAHAN, M. N. ISLAM-FARIDI, J. D. SHAW, H. S. RAI and S. C. SANDERSON et al. (2012): Widespread Triploidy in Western American Aspen (P. tremuloides). PLoS ONE 7 (10): e48406.]Search in Google Scholar
[MÜNTZING, A. (1936): The chromosomes of a giant Populus tremula. Hereditas 21: 383-393.10.1111/j.1601-5223.1936.tb03206.x]Search in Google Scholar
[NILSSON-EHLE, H. (1936): Note regarding the gigas form of Populus tremula found in nature. Hereditas 21: 372-82.]Search in Google Scholar
[ORJEDA, G., R. FREYRE and M. IWANAGA (1990): Production of 2n pollen in diploid Ipomoea trifida, a putative wild ancestor of sweet potato. J Hered 81: 462-467.10.1093/oxfordjournals.jhered.a111026]Search in Google Scholar
[OKORO, O. O. and GRACE, J. (1976): The physiology of rooting Populus cuttings. I. Carbohydrates and Photosynthesis. Physiol Plant 36: 133-138.10.1111/j.1399-3054.1976.tb03923.x]Search in Google Scholar
[ORTIZ, R. (1997): Occurrence and inheritance of 2n pollen in Musa. Ann Bot 79: 449-453.10.1006/anbo.1996.0367]Search in Google Scholar
[PAGLIARINI, M. S. (2000): Meiotic behaviour of economically important plant species: the relationship between fertility and male sterility. Genet Mol Biol 23: 997-1002.10.1590/S1415-47572000000400045]Search in Google Scholar
[PERLACK, R. D., L. L. WRIGHT, A. F. TURHOLLOW, R. L. GRAHAM, B. J. STOKES and D. C. ERBACH (2005): Biomass and feedstockfor a bioenergy and Bioproducts industry: The technical feasibility of a billion-ton annual supply. Oak Ridge National Laboratory, Oak Ridge, TN.10.2172/1216415]Search in Google Scholar
[RANJBAR, M., R. KARAMIAN and S. NOURI (2011): Diploidtetraploid mixoploidy in a new species of Astragalus (Fabaceae) from Iran. Ann Bot Fennici 48: 343-351.10.5735/085.048.0406]Search in Google Scholar
[R CORE TEAM (2013): R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0, Available at: http://www.R-project.org/.]Search in Google Scholar
[RIEMENSCHNEIDER, D. E., W. E. BERGUSON, D. I. DICKMANN, R. B. HALL, J. G. ISEBRANDS, C. A. MOHN, G. R. STANOSZ and G. A. TUSKAN (2001): Poplar breeding and testing strategies in the north-central ANDS.: Demonstration of potential yield and consideration of future research needs. The Forestry Chronicle 77: 245-253.10.5558/tfc77245-2]Search in Google Scholar
[RONALD, W. G. (1982): Intersectional hybridization of Populus sections, Leuce-Aigeiros and Leuce-Tacamahaca. Silvae Genet 31: 94-99.]Search in Google Scholar
[SAX, K. (1936): The experimental production of polyploidy. J Arnold Arbor 17: 153-59.10.5962/p.185351]Search in Google Scholar
[SCHENK, R. U. and A. C. HILDEBRANDT (1972): Medium and techniques for induction and growth of monocolyledonous and dicotyledonous plant cell cultures. Can J Bot 50: 199-204.10.1139/b72-026]Search in Google Scholar
[SCHLARBAUM, S. E. (1991): Cytogenetics of forest treespecies, pp. 593-618. In: Chromosome engineering in plant genetics and breeding, edited by T. TSUCHIYA and P. K. GUPTA, Elsevier Publ., Netherlands.10.1016/B978-0-444-88260-8.50037-9]Search in Google Scholar
[SIVOLAPOV, A. and T. A. BLAGODAROVA (1994): Different levels of mixoploidy in hybrid poplars, pp. 311-316. In: Cytogenetic studies of forest trees and shrub species, edited by Z. BORZAN and S. E. SCHLARBAUM, Proceedings of the first IUFRO Cytogenetics Working Party, September 8-11, 1993 Brijuni National Park Croatia.]Search in Google Scholar
[SKIEBE, K. (1965): Die Entstehung von polyploiden Populationen in der Evolution. Deutsch Landw (Berlin) 16: 340-343]Search in Google Scholar
[STANTON, B., J. EATON, J. JOHNSON, D. RICE, B. SCHUETTE and B. MOSER (2002): Hybrid poplar in the Pacific Northwest: The effects of market-driven management. J For 100: 28-33.]Search in Google Scholar
[STANTON, B. J., D. B. NEALE and S. LI (2010): Populus Breeding: From the classical to the genetic approach, pp. 309-312. In: Genetics and Genomics of Populus, Plant Genetics and Genomics: Crops and Models 8, edited by S. JANSSON et al. Springer Science+Business Media, DOI 10.1007/978-1-4419-1541-2_14.]Search in Google Scholar
[TANG, Z. Q., D. L. CHEN, Z. J. SONG, Y. C. HE and D. T. CAI (2010): In vitro induction and identification of tetraploid plants of Paulownia tomentosa. Plant Cell Tiss Organ Cult 102: 213-20.10.1007/s11240-010-9724-6]Search in Google Scholar
[VÄINÖLÄ, A. (2000): Polyploidization and early screening of Rhododendron hybrids. Euphytica 112: 239-44.10.1023/A:1003994800440]Search in Google Scholar
[VAN BUIJTENEN, J. P., P. N. JORANSON and D.W. EINSPAHR (1957): Naturally occurring triploid quaking aspen in the United States. Proc Soc Am Foresters: 62-64.]Search in Google Scholar
[VAN BUIJTENEN, J. P., P. N. JORANSON and D.W. EINSPAHR (1958): Diploid versus triploid aspen as pulpwood sources with reference to growth, chemical, physical, and pulping differences. TAPPI J 41: 170-175.]Search in Google Scholar
[VEILLEUX, R., N. A. MCHALE and F. I. LAUER (1982): 2n gametes in diploid Solanum: frequency and type of spindle abnormalities. Can J Genet Cytol 24: 301-314.10.1139/g82-032]Search in Google Scholar
[WANG, J., X. KANG, D. Li, H. CHEN and P. ZHANG (2010): Induction of diploid eggs with colchicine during embryo sac development in Populus. Silvae Genet 59: 40-48.10.1515/sg-2010-0005]Search in Google Scholar
[WANG, J., D. L. LI and X.Y. KANG (2012): Induction of unreduced megaspores with high temperature during megasporogenesis in Populus. Ann For Sci 69: 59-67.10.1007/s13595-011-0152-5]Search in Google Scholar
[WRIGHT L. L. (1994): Production technology status of woody and herbaceous crops. Biomass and Bioenergy 6: 191-20910.1016/0961-9534(94)90075-2]Search in Google Scholar
[XI, X. J., X. B. JIANG, D. LI, L. Q. GUO, J. F. ZHANG, Z. Z. WEI and B.L. LI (2011): Induction of 2n pollen by colchicine in Populus x popularis and its triploids breeding. Silvae Genet 60: 155-60.10.1515/sg-2011-0021]Search in Google Scholar
[YAO, C. L. and J.W. PU (1998): Timber characteristics and pulp properties of the triploid of Populus tomentosa. J Beijing For Univ 20: 18-21.]Search in Google Scholar
[ZHANG, Z.Y. and F. L. LI (1992): The techniques of pollen chromosome doubling of Populus tomentosa. J Beijing For Univ 14: 52-58.]Search in Google Scholar
[ZHANG, Z. and X. KANG (2010): Cytological characteristics of numerically unreduced pollen production in Populus tomentosa-Carr. Euphytica 173: 151-59.10.1007/s10681-009-0051-0]Search in Google Scholar
[ZHU, Z., X. KANG and Z. ZHANG (1997): Advances in the triploid breeding program of Populus tomentosa in China. J Beijing For Univ 6: 1-8.]Search in Google Scholar
[ZHU, Z., X.Y. KANG and Z. ZHANG (1998): Studies on selection of natural triploids of Populus tomentosa. Sci Silvae Sin 34: 22-31.]Search in Google Scholar