[ABDELGADIR, H. A., S. D. JOHNSON and J. VAN STADEN (2012): Pollen viability, pollen germination and pollen tube growth in the biofuel seed crop Jatropha curcas (Euphorbiaceae). S Afr J Bot 79: 132-139.10.1016/j.sajb.2011.10.005]Search in Google Scholar
[ALEZA, P., J. JUAREZ, J. CUENCA, P. OLLITRAULT and L. NAVARRO (2012): Extensive citrus triploid hybrid production by 2x × 4x sexual hybridizations and parent-effect on the length of the juvenile phase. Plant Cell Rep 31(9): 1723-1735.10.1007/s00299-012-1286-022614256]Search in Google Scholar
[BASTIAANSSEN, H. J. M., P. M. M. M. VAN DEN BERG, P. LINDHOUT, E. JACOBSEN and M. S. RAMANNA (1998): Postmeiotic restitution in 2n-egg formation of diploid potato. Heredity 81: 20-27.10.1046/j.1365-2540.1998.00370.x]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 autopolyploid plants. New Phytol 129: 1-22.10.1111/j.1469-8137.1995.tb03005.x33874422]Search in Google Scholar
[CRAMER, C. S. (1999): Laboratory techniques for determining ploidy in plants. HortTechnology 9(4): 594-596.10.21273/HORTTECH.9.4.594]Search in Google Scholar
[DAI, X., Q. HUANG, B. ZHOU, Z. GONG, Z. LIU and S. SHI (2013): Preparative isolation and purification of seven main antioxidants from Eucommia ulmoides Oliv. (Du-zhong) leaves using HSCCC guided by DPPH-HPLC experiment. Food Chem 139(1): 563-570.]Search in Google Scholar
[DHAWAN, O. P. and U. C. LAVANIA (1996): Enhancing the productivity of secondary metabolites via induced polyploidy: a review. Euphytica 87(2): 81-89.10.1007/BF00021879]Search in Google Scholar
[DU, H. Y., L. Y. DU, Y. T. N. WU and F. H. LI (2013): An elite variety for medicinal use: Eucommia ulmoides ‘Huazhong 1’. Sci Silvae Sin 49(11): 195.]Search in Google Scholar
[DU, H. Y., L. Y. DU, Y. T. N. WU and P. F. LIU (2014): An improved variety for samara and medicinal use: Eucommia ulmoides ‘Huazhong 3’. Sci Silvae Sin 50(1): 164.]Search in Google Scholar
[EIJLANDER, R. (1988): Manipulation of the 2ngametes frequencies in Solanum pollen. Euphytica 39(3): 45-50.10.1007/BF00043366]Search in Google Scholar
[EWALD, D. and K. ULRICH (2012): In vitro pollination in poplar of section Populus. Plant Cell Tiss Org 111(2): 255-258.10.1007/s11240-012-0189-7]Search in Google Scholar
[FALISTOCCO, E., N. TOSTI and M. FALCINELLI (1995): Cytomixis in pollen mother cells of diploid Dactylis, one of the origins of 2n gametes. J Hered86(6): 448-453.10.1093/oxfordjournals.jhered.a111619]Search in Google Scholar
[GAO, P. (2006): Gamete and zygote chromosome doubling of Eucommia ulmoides Oliver. Dissertation, Beijing Forestry University.]Search in Google Scholar
[GAO, P., W. LIN and X. Y. KANG (2004): Pollen chromosome doubling of Eucommia ulmoides induced by colchicine. J Beijing For Univ 26(4): 39-42.]Search in Google Scholar
[GAO, P., X. Y. KANG, H. G. YIN and S. D. WANG (2009): Induction of 2n pollen with high temperature in Eucommia ulmoides. Conference Proceeding of Forest Tree Genetics and Improvement at Era of Functional genomics. The Second Forestry Science Conference of China, Nanning, pp 599-604.]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
[KANG, X. Y. and Z. T. ZHU (1997): A study on the 2n pollen vitality and germinant characteristics of white poplars. Acta Bot Yun 19(4): 402-406.]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 Sin 27(1): 78-82.]Search in Google Scholar
[KANG, X. Y., C. SA, W. W. ZHANG, P. GAO, P. D. ZHANG and S. D. WANG (2007): A device for in vivo chromosome doubling with high temperature for trees. Chinese Patent, ZL200510011598.5.]Search in Google Scholar
[KATSIOTIS, A. and R. A. FORSBERG (1995): Pollen grain size in four ploidy levels of genus Avena. Euphytica 83(2): 103-108.10.1007/BF01678036]Search in Google Scholar
[LAI, H. G., X. CHEN, Z. CHEN, J. Q. YE, K. M. LI and J. P. LIU (2015): Induction of female 2n gametes and creation of tetraploids through sexual hybridization in cassava (Manihot esculenta). Euphytica 201(2): 265-273.10.1007/s10681-014-1207-0]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 × P. glandulosa by chromosome doubling of female gametes. Silvae Genet 57: 37-40.10.1515/sg-2008-0006]Search in Google Scholar
[MASHKINA, O. S., L. M. BURDAEVA, M. M. BELOZEROVA and L. N. VYUNOVA (1989): Method of obtaining diploid pollen of woody species. Lesovedenie 1: 19-25.]Search in Google Scholar
[MENDIBURU, A. O. and S. J. PELOQUIN (1977): The significance of 2n gametes in potato breeding. Theor Appl Genet 49: 53-61.10.1007/BF0027516424408580]Search in Google Scholar
[NAJČEVSKA, C. M. and G. J. SPECKMANN (1968): Numbers of chloroplasts and pollen grain pores in diploid and tetraploid varieties of some Trifolium species. Euphytica 17(3): 357-362.10.1007/BF00056236]Search in Google Scholar
[NAKADOZONO, Y., T. BAMBA, R. CHEN, S. NAMIMATSU, Y. NAKAZAWA and K. GYOKUSEN (2007): Induction and analysis of polyploid in Eucommia ulmoides Oliver. In International Symposium on Eucommia ulmoides 1: 112-115.10.3387/iseu.1.112]Search in Google Scholar
[NAKAZAWA, Y., T. TAKEDA, N. SUZUKI, T. HAYASHI, Y. HARADA, T. BAMBA and A. KOBAYASHI (2013): Histochemical study of trans-polyisoprene accumulation by spectral confocal laser scanning microscopy and a specific dye showing fluorescence solvatochromism in the rubber-producing plant, Eucommia ulmoides Oliver. Planta 238(3): 549-560.10.1007/s00425-013-1912-223775438]Search in Google Scholar
[OKAZAKI, K., K. KURIMOTO, I. MIYAJIMA, A. ENAMI, H. MIZUOCHI, Y. MATSUMOTO and H. OHYA (2005): Induction of 2n pollen in tulips by arresting the meiotic process with nitrous oxide gas. Euphytica 143(1-2): 101-114.10.1007/s10681-005-2910-7]Search in Google Scholar
[ORTIZ, R. (1997): Occurrence and inheritance of 2n pollen in Musa. Ann Bot-London 79(4): 449-453.10.1006/anbo.1996.0367]Search in Google Scholar
[PÉCRIX, Y., G. RALLO, H. FOLZER, M. CIGNA, S. GUDIN and M. LE BRIS (2011): Polyploidization mechanisms: temperature environment can induce diploid gamete formation in Rosa sp. J Exp Bot 62(10): 3587-3597.10.1093/jxb/err05221398431]Search in Google Scholar
[RIM, Y. W. and P. R. BEUSELINCK (1996): Cytology of 2n pollen formation and pollen morphology in diploid Lotus tenuis (Fabaceae). Amer J Bot 83(8): 1057-1062.10.1002/j.1537-2197.1996.tb12803.x]Search in Google Scholar
[SIMON, C. J. and J. C. SANFORD (1990): Separation of 2n potato pollen from a heterogeneous pollen mixture by velocity sedimentation. Hortscience 25(3): 342-344.10.21273/HORTSCI.25.3.342]Search in Google Scholar
[SUGIURA, A., T. OHKUMA, Y. A. CHOI, R. TAO and M. TAMURA (2000): Production of nonaploid (2n=9x) Japanese persimmons (Diospyros kaki) by pollination with unreduced (2n=6x) pollen and embryo rescue culture. J Am Soc Hortic Sci 125(5): 609-614.10.21273/JASHS.125.5.609]Search in Google Scholar
[TAKAMURA, T. and I. MIYAJIMA (2002): Origin of tetraploid progenies in 4x × 2x crosses of Cyclamen (Cyclamen persicum Mill.). J Jap Soc Hortic Sci 71(5): 632-637.10.2503/jjshs.71.632]Search in Google Scholar
[TONDINI, F., S. TAWOLETTI, A. MARIANI and F. VERONESI (1993): A statistical approach to estimate the frequency of n, 2n and 4n pollen grains in diploid alfalfa. Euphytica 69: 109-114.10.1007/BF00021733]Search in Google Scholar
[VAN BREUKELEN, E. W. M. (1982): Competition between 2x and x pollen in styles of Solanum tuberosum determined by a quick in vivo method. Euphytica 31(3): 585-590.10.1007/BF00039196]Search in Google Scholar
[VORSA, N. and R. ORTIZ (1992): Cytology of 2n pollen formation in a blueberry aneuploid (2n=4x+9=57). J Hered 83(5): 346-349.10.1093/oxfordjournals.jhered.a111229]Search in Google Scholar
[WANG, J., X. KANG and Q. ZHU (2010a): Variation in pollen formation and its cytological mechanism in an allotriploid white poplar. Tree Genet Genom 6(2): 281-290.10.1007/s11295-009-0248-3]Search in Google Scholar
[WANG, J., X. KANG, D. LI, H. CHEN and P. ZHANG (2010b): 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., X. Y. KANG and D. L. LI (2012a): High temperature- induced triploid production during embryo sac development in Populus. Silvae Genet 61: 85-93.10.1515/sg-2012-0011]Search in Google Scholar
[WANG, J., D. LI and X. KANG (2012b): Induction of unreduced megaspores with high temperature during megasporogenesis in Populus. Ann Forest Sci 69: 59-67.10.1007/s13595-011-0152-5]Search in Google Scholar
[WU, H., S. ZHENG, Y. HE, G. YAN, Y. BI and Y. ZHU (2007): Diploid female gametes induced by colchicine in Oriental lilies. Sci Hortic 114(1): 50-53.10.1016/j.scienta.2007.04.004]Search in Google Scholar
[XI, X., L. GUO, W. XU, J. ZHANG and B. LI (2014): Megasporogenesis, megagametogenesis, and induction of 2n eggs with colchicine in poplar section Aigeiros. Scand J Forest Res 29(6): 527-536.10.1080/02827581.2014.935472]Search in Google Scholar
[YAO, X., J. DENG and H. HUANG (2012): Genetic diversity in Eucommia ulmoides (Eucommiaceae), an endangered traditional Chinese medicinal plant. Conserv Genet 13(6): 1499-1507.10.1007/s10592-012-0393-3]Search in Google Scholar
[YOU, H., T. JIA, J. TIAN, J. WANG and X. KANG (2014): Characteristics of in vitro pollen germination and microfilament distribution of pollen tubes of Eucommia ulmoides Oliv. Acta Bot Boreal-Occident Sin 34(3): 495-501.]Search in Google Scholar
[ZHANG, Z. Y., F. L. LI, Z. T. ZHU and X. Y. KANG (1997): Doubling technology of pollen chromosome of Populus tomentosa and its hybrid. J Beijing For Univ (English Ed.) 6(2): 9-20.]Search in Google Scholar
[ZHOU, Z. X. (1993): Eucommia ulmoides of China. Guizhou Science and Technology Press, Guiyang.]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 (English Ed.) 6(2): 1-8.]Search in Google Scholar