Dr. Ahmad Omar

Dr. Ahmad Omar

   Research Assistant Scientist
   Horticulture Science/Plant Biotechnology 
   Phone: 863.956.8678
   Fax: 863.956.4631
   Email: omar71@ufl.edu



Peer-reviewed Research

Murata, M.M., Omar, A.A., Mou, Z., Chase, C.D., Grosser, J.W., Graham, J.H., 2018. Novel plastid-nuclear genome combinations enhance resistance to citrus canker in cybrid grapefruit. Frontiers in Plant Science, 9:1858. https://dx.doi.org/10.3389%2Ffpls.2018.01858

Omar, A.A., Mohamed, A.H., Nasr, M.I., El-Halafawy, K.A., Alabsawy, E.A., Hamdi, A.I., Zayed, E.M., 2018. Molecular characterization of Soybean (Glycine max L. Merr) genotypes tolerant and susceptible to cotton leaf worm (Spodoptera littoralis). American Journal of Biochemistry and Molecular Biology 8, 34-47. https://doi.org/10.3923/ajbmb.2018.34.47

Omar, A.A., Murata, M.M., El-Shamy, H.A., Graham, J.H., and Grosser, J.W. 2018. Enhanced resistance to citrus canker in transgenic mandarin expressing Xa21 from rice. Transgenic Research. 27:179-191. http://dx.doi.org/10.3923/ajbmb.2018.34.47

Killiny, N., M.F. Valim, S.E. Jones, A.A. Omar, F. Hijaz, F.G. Gmitter Jr, and J.W. Grosser. 2017. Metabolically speaking: Possible reasons behind the tolerance of ‘Sugar Belle’ mandarin hybrid to huanglongbing. Plant Physiol. Biochem. 116:36-47. https://doi.org/10.1016/j.plaphy.2017.05.001

Omar, A.A., M.M. Murata, Q. Yu, F.G. Gmitter, Jr., C.D. Chase, J.H. Graham, and J.W. Grosser. 2017. Production of three new grapefruit cybrids with potential for improved citrus canker resistance. In Vitro Cell. Dev. Biol. Plant. 53:256-269. https://doi.org/10.1007/s11627-017-9816-7

Khalifa, S.A., A.A. Omar, and A.H. Mohamed. 2017. The effect of substituting milk fat by peanut oil on the quality of white soft cheese. International Journal of Dairy Science. 12:28-40. http://doi.org/10.3923/ijds.2017.28.40

ElSayed, A.I., M. Boulila, D.C. Odero, A.A. Omar, A.M. Gomaa, and R. Viswanathan. 2017. Characterization of ORF0 and ORF1 and their Roles in Recombination and Replication of Sugarcane yellow leaf virus. American Journal of Biochemistry and Molecular Biology. 7:41-52. http://dx.doi.org/10.3923/ajbmb.2017.41.52

Ibrahim, M.M., A.O. Mohamed, A.H. Mohamed, and A.A. Omar. 2016. Effect of some girdling treatments on fruiting behavior and physio-chemical properties of Washington navel orange trees. Journal of Agriculture and Veterinary Science. 9:58-65.  https://doi.org/10.9790/2380-0906015865

Zayed, E., M. Sayed, and A.A. Omar. 2015. Genetic variations between two ecotypes of Egyptian clover by inter-simple sequence repeat (ISSR) techniques. African Journal of Biotechnology. 14:1947-1953.  https://doi.org/10.5897/AJB2015.14609

Grosser, J.W., A.A. Omar, J.A. Gmitter, and J.P. Syvertsen. 2012. Salinity Tolerance of ‘Valencia’ Orange Trees on Allotetraploid Rootstocks. Proc. Fla. State Hort. Soc. 125:50-55.

Grosser, J.W., M. Dutt, A.A. Omar, V. Orbovic, and G. Barthe. 2011. Progress towards the development of transgenic disease resistance in citrus. Acta Hort. (ISHS). 892:101-107. https://doi.org/10.17660/ActaHortic.2011.892.12

Dutt, M., A.A. Omar, V. Orbovic, G. Barthe, and J.W. Grosser. 2010. Progress towards incorporation of antimicrobial peptides for disease resistance in citrus. ICC:258-264.

Omar, A.A., A.H. Mohamed, and J.W. Grosser. 2009. Study of transgene expression by phloem-specific promoter in transgenic citrus plant. Journal of Biological Chemistry and Environmental Sciences. 4: 647-661.

Abouziena, H.F., A.A. Omar, S.D. Sharma, and M. Singh. 2009. Efficacy comparison of some new natural product herbicides for weed control at two growth stages. Weed Technol. 23:431-437. https://doi.org/10.1614/WT-08-185.1

Abouziena, H.F., R.A. Elmergawi, S. Sharma, A.A. Omar, and M. Singh. 2009. Zinc antagonizes glyphosate efficacy on yellow nutsedge (Cyperus esculentus). Weed Sci. 57:16-20. https://doi.org/10.1614/WS-08-084.1

Omar, A.A., and J.W. Grosser. 2008. Comparison of endoplasmic reticulum targeted and non-targeted cytoplasmic GFP as a selectable marker in citrus protoplast transformation. Plant Sci. 174:131-139. https://doi.org/10.1016/j.plantsci.2007.10.003

Omar, A.A., M.G.H. Dekkers, J.H. Graham, and J.W. Grosser. 2008. Estimation of Transgene Copy Number in Transformed Citrus Plants by Quantitative Multiplex Real-Time PCR. Biotechnol. Prog. 24:1241-1248. https://doi.org/10.1002/btpr.62

Omar, A.A., W.Y. Song, and J.W. Grosser. 2007. Introduction of Xa21, a Xanthomonas-resistance gene from rice, into 'Hamlin' sweet orange [Citrus sinensis (L.) Osbeck] using protoplast-GFP co-transformation or single plasmid transformation. J. Horticult. Sci. Biotechnol. 82:914-923. https://doi.org/10.1080/14620316.2007.11512326

Omar, A.A., and J.W. Grosser. 2007. Protoplast co-transformation and regeneration of transgenic `Hamlin` sweet orange plants containing a cDNA Xa21 Xanthomonas resistance gene and GFP. Acta Horticulture. 738:235-244. https://doi.org/10.17660/ActaHortic.2007.738.23

Abouziena, H.F., E.R. El-Desoki, S. Sharma, A.A. Omar, and M. Singh. 2007. Evaluation of sowing in hills on ridges as a new technique for enhancement of Wheat (Triticum aestivum, L) Productivity. Egyptian Journal of Agronomy. 29:85-100.

Past Positions

  • Associate Professor (Sabbatical), 2016 – Present, Biochemistry Department, College of Agriculture, Zagazig University, Egypt
  • Postdoctoral Associate, 2011 – 2018, CREC, University of Florida, Lake Alfred FL
  • Assistant Professor, 2009 – 2016, Biochemistry Department, College of Agriculture, Zagazig University, Egypt
  • Postdoctoral Associate, 2006 – 2009, CREC, University of Florida, Lake Alfred FL
  • Research Assistant, 2000 – 2006, CREC, University of Florida, Lake Alfred FL
  • Research Assistant, 1994 – 1999, Biochemistry Department, College of Agriculture, Zagazig University, Egypt
  • Chemist and Researcher, 1993 – 1994, Micro-Analysis Unit, Center Lab, College of Agriculture, Zagazig University, Egypt

Book Chapters

Omar, A.A., M. Dutt, F.G. Gmitter, Jr., and J.W. Grosser. 2016. Somatic Embryogenesis: Still a Relevant Technique in Citrus Improvement. In In Vitro Embryogenesis in Higher Plants. Vol. 1359. M.A. Germanà and M. Lambardi, editors. Springer, New York. 289-327.

Grosser, J.W., and A.A. Omar. 2011. Protoplasts – an increasingly valuable tool in plant research. In Plant Cell Culture, Development and Biotechnology. R.N. Trigiano and D.J. Gray, editors. Taylor and Francis (CRC Press, LLC), Boca Raton, Florida.

Professional Membership

  • The Society for In vitro Biology (SIVB)
  • American Society of Horticultural Science (ASHS)
  • International Society of Citriculture (ISC)
  • The Egyptian Society of Agriculture Biochemistry (ESAB)


2006 Ph.D. University of Florida, Gainesville, FL, Horticultural Sciences/Plant Biotechnology

1997 M.Sc. Zagazig University, Zagazig, Egypt, Biochemistry

1993 B.Sc. Zagazig University, Zagazig, Egypt, Agriculture Biochemistry