Although significant progress has been made on Agrobacterium -mediated wheat transformation, the current methodologies use immature embryos as recipient tissues, a process which is labor intensive, time consuming and expensive. In this study, we have managed to develop an Agrobacterium -based transformation scheme using explants derived from mature embryos. Based on transient expression of β -glucuronidase (GUS) marker, mature embryo halves prepared from freshly imbibed seeds were generally most susceptible to Agrobacterium -mediated T-DNA transfer. According to the results of callus induction and shoot production, Yumai 66 and Lunxuan 208 showed higher selection and regeneration efficiency than Bobwhite. In line with this finding, fertile T 0 transgenic plants were most readily obtained for both spring and winter wheat when mature embryo halves were used for co-inoculation by Agrobacterium cells. The presence of the antibiotic selection marker ( nptII , encoding neomycin phosphotransferase II) in the T 0 plants was revealed by both genomic PCR amplification and the enzyme-linked immunosorbent assay (ELISA). Additional analysis showed that the transgene was stably inherited from the two different generations and segregated normally among the T 1 progenies. Further development along this line will raise the efficiency of wheat transformation and increase the use of this approach in the molecular breeding of wheat crop.
Cheng, M., Fry, J.E., Pang, S., Zhou, H., Hironaka, C.M., Duncan, D.R., Conner, T.W., Wan, Y. 1997. Genetic transformation of wheat mediated by Agrobacterium tumefaciens . Plant Physiol. 115 :971–980.
Wan Y. , 'Genetic transformation of wheat mediated by Agrobacterium tumefaciens ' (1997 ) 115 Plant Physiol. : 971 -980 .
Cheng, M., Hu, T., Layton, J., Liu, C.N., Fry, J.E. 2003. Desiccation of plant tissues post- Agrobacterium infection enhances T-DNA delivery and increases stable transformation efficiency in wheat. In Vitro Cell. Dev. Biol. Plant 39 :595–604.
Fry J.E. , 'Desiccation of plant tissues post-Agrobacterium infection enhances T-DNA delivery and increases stable transformation efficiency in wheat ' (2003 ) 39 Vitro Cell. Dev. Biol. Plant : 595 -604 .
Cheng, M., Lowe, B.A., Spencer, T.M., Ye, X., Armstrong, C.L. 2004. Factors influencing Agrobacterium -mediated transformation of monocotyledonous species. In Vitro Cell. Dev. Biol. Plant 40 :31–45.
Armstrong C.L. , 'Factors influencing Agrobacterium-mediated transformation of monocotyledonous species ' (2004 ) 40 Vitro Cell. Dev. Biol. Plant : 31 -45 .
Deblaere, R., Bytebier, B., de Greve, H., Deboeck, F., Schell, J., van Montagu, M., Leemans, J. 1985. Efficient octopine Ti plasmid derived vectors for Agrobacterium -mediated gene transfer to plants. Nucl. Acids Res. 13 :4777–4788.
Leemans J. , 'Efficient octopine Ti plasmid derived vectors for Agrobacterium-mediated gene transfer to plants ' (1985 ) 13 Nucl. Acids Res. : 4777 -4788 .
Dellaporta, S.L., Wood, J., Hicks, J.B. 1983. A plant DNA mini-preparation: Version II. Plant Mol. Biol. Rep. 1 :19–21.
Hicks J.B. , 'A plant DNA mini-preparation: Version II ' (1983 ) 1 Plant Mol. Biol. Rep. : 19 -21 .
Ditta, G., Stanfield, S., Corbin, D., Helinsnki, D.R. 1980. Broad host range cloning system for gram negative bacteria: Construction of gene bank of Rhizobium meliloti . Proc. Natl. Acad. Sci. USA 77 :7374–7351.
Helinsnki D.R. , 'Broad host range cloning system for gram negative bacteria: Construction of gene bank of Rhizobium meliloti ' (1980 ) 77 Proc. Natl. Acad. Sci. USA : 7374 -7351 .
Hu, T., Metz, S., Chay, C., Zhou, H.P., Biest, N., Chen, G., Cheng, M., Feng, X., Radionenko, M., Lu, F., Fry, J.E. 2003. Agrobacterium -mediated large-scale transformation of wheat ( Triticum aestivum L.) using glyphosate selection. Plant Cell Rep. 21 :1010–1019.
Fry J.E. , 'Agrobacterium-mediated large-scale transformation of wheat (Triticum aestivum L.) using glyphosate selection ' (2003 ) 21 Plant Cell Rep. : 1010 -1019 .
Ignacimuthu, S., Arockiasamy, S., Terada, R. 2000. Genetic transformation of rice: current status and future prospects. Curr. Sci. 79 :186–195.
Terada R. , 'Genetic transformation of rice: current status and future prospects ' (2000 ) 79 Curr. Sci. : 186 -195 .
Jefferson, R.A., Kavanagh, T.A., Bevan, M.V. 1987. GUS fusions: β-glucuronidase as a sensitive and versatile gene fusion marker in higher plants. EMBO J. 6 :3901–3907.
Bevan M.V. , 'GUS fusions: β-glucuronidase as a sensitive and versatile gene fusion marker in higher plants ' (1987 ) 6 EMBO J. : 3901 -3907 .
Jiang, J.D., Linscombe, S.D., Wang, J.L., Oard, J.H. 2000. High efficiency transformation of US rice lines from mature seed-derived calli and segregation of glufosinate resistance under field conditions. Crop Sci. 40 :1729–1741.
Oard J.H. , 'High efficiency transformation of US rice lines from mature seed-derived calli and segregation of glufosinate resistance under field conditions ' (2000 ) 40 Crop Sci. : 1729 -1741 .
Jones, H.D., Angela, D., Wu, H.X. 2005. Review of methodologies and a protocol for the Agrobacterium -mediated transformation of wheat. Plant Methods 1 :5.
Wu H.X. , 'Review of methodologies and a protocol for the Agrobacterium-mediated transformation of wheat ' (2005 ) 1 Plant Methods : 5 -.
Liang, H., Zhu, Y.F., Zhu, Z., Sun, D.F., Jia, X. 2004. Obtainment of transgenic wheat with insecticidal lectin from snowdrop (Galanthus nivalis agglutinin, GNA) gene and analysis of resistance to aphids. Acta Genet. Sinica 31 :189–194.
Jia X. , 'Obtainment of transgenic wheat with insecticidal lectin from snowdrop (Galanthus nivalis agglutinin, GNA) gene and analysis of resistance to aphids ' (2004 ) 31 Acta Genet. Sinica : 189 -194 .
Khanna, H.K., Daggard, G.E. 2003. Agrobacterium tumefaciens-mediated transformation of wheat using a superbinary vector and a polyamine-supplemented regeneration medium. Plant Cell Rep. 21 :429–436.
Daggard G.E. , 'Agrobacterium tumefaciens-mediated transformation of wheat using a superbinary vector and a polyamine-supplemented regeneration medium ' (2003 ) 21 Plant Cell Rep. : 429 -436 .
Patnaik, D., Khurana, P. 2003. Genetic transformation of Indian bread (T. aestivum) and pasta (T. durum) wheat by particle bombardment of mature embryo-derived calli. BMC Plant Biology 3 :5–16.
Khurana P. , 'Genetic transformation of Indian bread (T. aestivum) and pasta (T. durum) wheat by particle bombardment of mature embryo-derived calli ' (2003 ) 3 BMC Plant Biology : 5 -16 .
Sambrook, J., Fritsch, E.F., Maniatis, T. 1989. Molecular Cloning: A Laboratory Manual, 2nd ed., New York: Cold Spring Harbor Laboratory Press.
Maniatis T. , '', in Molecular Cloning: A Laboratory Manual , (1989 ) -.
Shrawat, A.K, Lorz, H. 2006. Agrobacterium -mediated transformation of cereals: a promising approach crossing barriers. Plant Biotech. J. 4 :575–603.
Lorz H. , 'Agrobacterium-mediated transformation of cereals: a promising approach crossing barriers ' (2006 ) 4 Plant Biotech. J. : 575 -603 .
Sivamani, E., Shen, P., Opalka, N., Beachy, R.N., Fauquet, C.M. 1996. Selection of large quantities of embryogenic calli form indica rice seeds for production of fertile transgenic plants using the biolistic method. Plant Cell Rep. 15 :322–327.
Fauquet C.M. , 'Selection of large quantities of embryogenic calli form indica rice seeds for production of fertile transgenic plants using the biolistic method ' (1996 ) 15 Plant Cell Rep. : 322 -327 .
Southern, E.M. 1975. Detection of specific sequences among DNA fragments separated by gel electrophoresis. J. Mol. Biol. 98 :503–517.
Southern E.M. , 'Detection of specific sequences among DNA fragments separated by gel electrophoresis ' (1975 ) 98 J. Mol. Biol. : 503 -517 .
Terada, R., Asao, H., Lida, S. 2004. A large-scale Agrobacterium -mediated transformation procedure with a strong positive-negative selection for gene targeting in rice ( Oryza sativa L.). Plant Cell Rep. 22 :653–659.
Lida S. , 'A large-scale Agrobacterium-mediated transformation procedure with a strong positive-negative selection for gene targeting in rice (Oryza sativa L.) ' (2004 ) 22 Plant Cell Rep. : 653 -659 .
Vasil, I.K., Vasil, V. 2006. Transformation of wheat via particle bombardment. Methods Mol. Biol. 318 : 273–283.
Vasil V. , 'Transformation of wheat via particle bombardment ' (2006 ) 318 Methods Mol. Biol. : 273 -283 .
Vasil, V., Castillo, A.M., Fromm, M.E., Vasil, I.K. 1992. Herbicide resistant fertile transgenic wheat plants obtained by microprojectile bombardment of regenerable embryogenic callus. Bio/Technology 10 :667–674.
Vasil I.K. , 'Herbicide resistant fertile transgenic wheat plants obtained by microprojectile bombardment of regenerable embryogenic callus ' (1992 ) 10 Bio/Technology : 667 -674 .
Vasil, V., Srivastava, V., Castillo, A.M. 1993. Rapid production of transgenic wheat plants by direct bombardment of cultured immature embryos. Bio/Technology 11 :1153–1158.
Castillo A.M. , 'Rapid production of transgenic wheat plants by direct bombardment of cultured immature embryos ' (1993 ) 11 Bio/Technology : 1153 -1158 .
Wu, H., Sparks, C., Amoah, B., Jones, H.D. 2003. Factors influencing successful Agrobacterium -mediated genetic transformation of wheat. Plant Cell Rep. 21 :659–668.
Jones H.D. , 'Factors influencing successful Agrobacterium-mediated genetic transformation of wheat ' (2003 ) 21 Plant Cell Rep. : 659 -668 .
Xu, Q.F., Li, L.C., Chen, X., Ma, Y.Z., Ye, X.G., Zhang, Z.Y., Xu, H.J., Xin, Z.Y. 2001. Study on the obtaining of transgenic wheat with GNA alien gene by biolistic particle. Sci. Agricult. Sinica 34 :5–8.
Xin Z.Y. , 'Study on the obtaining of transgenic wheat with GNA alien gene by biolistic particle ' (2001 ) 34 Sci. Agricult. Sinica : 5 -8 .
Ye, X.G., Chen, H.M., Xu, H.J., Du, L.P., Lu, W.Z., Huang, Y.H. 2005. Development of transgenic wheat plants with chitinase and β -1,3-glucanase genes and their resistance to Fusarium head blight. Acta Agron. Sinica 31 :583–586.
Huang Y.H. , 'Development of transgenic wheat plants with chitinase and β-1,3-glucanase genes and their resistance to Fusarium head blight ' (2005 ) 31 Acta Agron. Sinica : 583 -586 .
Zhang, Z., Xing, A., Staswick, P., Clemente, T. 1999. The use of glufosinate as a selective agent in Agrobacterium -mediated transformation of soybean. Plant Cell Tiss. Org. Cult. 56 :37–46.
Clemente T. , 'The use of glufosinate as a selective agent in Agrobacterium-mediated transformation of soybean ' (1999 ) 56 Plant Cell Tiss. Org. Cult. : 37 -46 .
Zhou, H., Berg, J.D., Blank, S.E., Chay, C.A., Chen, G., Eskelsen, S.R. 2003. Field efficacy assessment of transgenic roundup ready wheat. Crop Sci. 43 :1072–1075.
Eskelsen S.R. , 'Field efficacy assessment of transgenic roundup ready wheat ' (2003 ) 43 Crop Sci. : 1072 -1075 .