Dr. Ahmad AlSayed Mohamad Omar
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Dr. Ahmad AlSayed Mohamad Omar

Research Assistant Scientist / Professor
University of Florida, USA/Zagazig University, Egypt

Highest Degree
PostDoc. in Plant Biotechnology from University of Florida, USA

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Biography

Dr. Ahmad AlSayed Mohamad Omar is currently working as Associate Professor at Plant Genetics Improvement, Department of Horticulture Sciences, University of Florida, Citrus research and Education Center, Lake Alfred, Florida, USA. He has completed his PhD in Horticulture, and Post-Doctoral Research Associate from same University. Previously he was appointed as Chemist and Researcher, and Assistant Professor at Plant Biochemistry and Molecular Biology, Biochemistry Department, College of Agriculture, Zagazig University, Zagazig, Egypt. He is professional member of The Society for In Vitro Biology, American Society of Horticultural Science, International Society of Citroculture, and International Society for Horticultural Science, Florida State Horticultural Society, American Society of Plant Biologist, and The Egyptian Society of Agriculture Biochemistry. Dr. Ahmad received honors includes Recipient of the Distinguished Scholar Award of the Arab Fund Fellowship Program, The SIVB Student Award for the best student paper presented at the In Vitro Biology Meeting, Ministry of Higher Education, Egypt, Ph.D. Scholarship, and Zagazig University Highest Distinction Awards for achieving the highest standing in the undergraduate program in the College of Agriculture. He is also serving as member of editorial board and reviewer for journals such as American Journal of Plant Physiology, Biotechnology, Asian Journal of Plant Sciences, Asian Journal of Biochemistry, American Journal of Biochemistry and Molecular Biology, Biotechnology Progress, International journal of Agricultural and Food Research, International Journal of Molecular Sciences, Molecular Biology Reports, Plant Cell, Tissue and Organ Culture and HortScience. He has 22 publications in journals as author/co-author.

Area of Interest:

Biochemistry and Molecular Biology
100%

Research Publications in Numbers

Books
0
Chapters
6
Articles
60
Abstracts
17

Selected Publications

  1. Soriano, L., A.A. Omar and A.P. Martinelli, 2022. Citrus Protoplast Isolation and Plant Regeneration Through Somatic Embryogenesis. In: Somatic Embryogenesis, Ramírez-Mosqueda, M.A., Humana, New York, United States, ISBN: 978-1-0716-2485-2, pp: 111-126.
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  2. Satti, S.H., N.I. Raja, M. Ikram, H.F. Oraby and Z.U.R. Mashwani et al., 2022. Plant-based titanium dioxide nanoparticles trigger biochemical and proteome modifications in Triticum aestivum L. under biotic stress of Puccinia striiformis. Molecules, Vol. 27. 10.3390/molecules27134274.
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  3. Omar, A.A., A.I. ElSayed and A.H. Mohamed, 2022. Tangerine (Citrus reticulata L.) Wastes: Chemistry, Properties and Applications. In: Mediterranean Fruits Bio-wastes, Ramadan, M.F. and M.A. Farag (Eds.), Springer, Cham, Switzerland, ISBN: 978-3-030-84436-3, pp: 287-302.
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  4. Khan, M., Z.U.R. Mashwani, M. Ikram, N.I. Raja, A.H. Mohamed, G. Ren and A.A. Omar, 2022. Efficacy of green cerium oxide nanoparticles for potential therapeutic applications: Circumstantial insight on mechanistic aspects. Nanomaterials, Vol. 12. 10.3390/nano12122117.
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  5. Ikram, M., N.I. Raja, Z.U.R. Mashwani, A.A. Omar, A.H. Mohamed, S.H. Satti and E. Zohra, 2022. Phytogenic selenium nanoparticles elicited the physiological, biochemical, and antioxidant defense system amelioration of huanglongbing-infected ‘kinnow’ mandarin plants. Nanomaterials, Vol. 12. 10.3390/nano12030356.
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  6. Gaikwad, P.N., V. Sharma, J. Singh, G.S. Sidhu, H. Singh and A.A. Omar, 2022. Biotechnological advancements in Phytophthora disease diagnosis, interaction and management in citrus. Sci. Hortic., 10.1016/j.scienta.2022.111739.
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  7. Fikry, A.M., K.S. Radhi, M.A.S. Abourehab, T.A.M. Abou Sayed-Ahmed and M.M. Ibrahim et al., 2022. Effect of inorganic and organic nitrogen sources and biofertilizer on murcott mandarin fruit quality. Life, Vol. 12. 10.3390/life12122120.
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  8. ElSayed, A.I., A.H. Mohamed, M.S. Rafudeen, A.A. Omar, M.F. Awad and E. Mansour, 2022. Polyamines mitigate the destructive impacts of salinity stress by enhancing photosynthetic capacity, antioxidant defense system and upregulation of calvin cycle-related genes in rapeseed (Brassica napus L.). Saudi J. Biol. Sci., 29: 3675-3686.
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  9. Awad-Allah, M.M.A., K.A. Attia, A.A. Omar, E.S. Dessoky and F.M. Alzuaibr et al., 2022. Development of new iso-cytoplasmic rice-restorer lines and new rice hybrids with superior grain yield and grain quality characteristics by utilizing restorers' fertility genes. Genes, Vol. 13. 10.3390/genes13050808.
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  10. Awad-Allah, M.M.A., K.A. Attia, A.A. Omar, A.H. Mohamed and R.M. Habiba et al., 2022. Combining ability and gene action controlling agronomic traits for cytoplasmic male sterile line, restorer lines, and new hybrids for developing of new drought-tolerant rice hybrids. Genes, Vol. 13. 10.3390/genes13050906.
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  11. Zohra, E., M. Ikram, A.A. Omar, M. Hussain and S.H. Satti et al., 2021. Potential applications of biogenic selenium nanoparticles in alleviating biotic and abiotic stresses in plants: A comprehensive insight on the mechanistic approach and future perspectives. Green Process. Synth., 10: 456-475.
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  12. Radwan, M.E.H., H.S. Taha, A.I. ElSayed and A.A. Omar, 2021. Evaluation of VDR gene FokI polymorphism and serum vitamin D level in gestational diabetes mellitus (Egyptian case-control study). Meta Gene, Vol. 29. 10.1016/j.mgene.2021.100908.
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  13. Omar, A.A., A.I. ElSayed and A.H. Mohamed, 2021. Genetic Diversity and Ecotypes of Opuntia spp. In: Opuntia spp.: Chemistry, Bioactivity and Industrial Applications, Ramadan, M.F., T.E.M. Ayoub and S. Rohn (Eds.), Springer, Cham, Switzerland, ISBN: 978-3-030-78444-7, pp: 181-199.
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  14. Mohamed, A.H., A.A. Omar, A.M. Attya, M.M.A. Elashtokhy, E.M. Zayed and R.M. Rizk, 2021. Morphological and molecular characterization of some Egyptian six-rowed barley (Hordeum vulgare L.) Plants, Vol. 10. 10.3390/plants10112527.
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  15. Jia, H., A.A. Omar, V. Orbović and N. Wang, 2021. Biallelic editing of the LOB1 promoter via CRISPR/Cas9 creates canker-resistant ‘duncan’ grapefruit. Phytopathology®, 112: 308-314.
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  16. El-Husseny, M., A.I. ElS, S.M. Eldeeb, H.S. Taha and A.A. Omar, 2021. Impact of maternal vitamin D receptor (VDR) gene polymorphisms on spontaneous preterm birth (Egyptian case-control study). J. Med. Sci., 21: 9-16.
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  17. Alam-Eldein, S.M., H.A. Ennab, A.E.D.K. Omar and A.A. Omar, 2021. Harvest and Postharvest Technology of Opuntia spp. In: Opuntia spp.: Chemistry, Bioactivity and Industrial Applications, Ramadan, M.F., T.E.M. Ayoub and S. Rohn (Eds.), Springer, Cham, Switzerland, ISBN: 978-3-030-78444-7, pp: 219-255,.
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  18. Alam-Eldein, S.M., A.E.K. Omar, H.A. Ennab and A.A. Omar, 2021. Cultivation and Cultural Practices of Opuntia spp. In: Opuntia spp.: Chemistry, Bioactivity and Industrial Applications, Ramadan, M.F., T.E.M. Ayoub and S. Rohn (Eds.), Springer, Cham, Switzerland, ISBN: 978-3-030-78443-0, pp: 121-158.
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  19. Omar, A.A., S. Mahgoub, A. Salama, E. Likotrafiti, J. Rhoades, C. Christakis and P. Samaras, 2020. Evaluation of Lactobacillus kefiri and manganese peroxidase‐producing bacteria for decolorization of melanoidins and reduction of chemical oxygen demand. Water Environ. J. 35: 704-714.
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  20. Omar, A.A., E.M. Zayed, M.F. El-Enany and G.A.A. El-Daem, 2020. Impact of dodder (Cuscuta spp.) infestation and gamma radiation on fahl ecotype of the Egyptian clover. J. Applied Sci., 20: 14-25.
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  21. Killiny, N., S.E. Jones, F. Hijaz, A. Kishk and Y. Santos-Ortega et al., 2020. Metabolic profiling of hybrids generated from pummelo and citrus latipes in relation to their attraction to diaphorina citri, the vector of huanglongbing. Metabolites, 10.3390/metabo10120477.
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  22. ElSayed, A.I., M. Boulila, M.S. Rafudeen, A.H. Mohamed, S. Sengupta, M. Rady and A.A. Omar, 2020. Melatonin regulatory mechanisms and phylogenetic analyses of melatonin biosynthesis related genes extracted from peanut under salinity stress. Plants, 10.3390/plants9070854.
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  23. Boulila, M., A.I.ElSayed, M.S. Rafudeen and A.A. Omar, 2020. Investigating molecular evolutionary forces and phylogenetic relationships among melatonin precursor-encoding genes of different plant species. Mol. Biol. Rep., 47: 1625-1636.
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  24. Ali, B.S.M., A.I. ElSayed, M.A. Doheem, A.M.A. Eita and A.A. Omar, 2020. Effect of milk thistle (Silybum marianum (L.) Gaertn) seed extract on bacterial Activities and growth of human liver cancer cells. J. Biotechnol. Res., 6: 27-33.
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  25. Murata, M.M., A.A. Omar, Z. Mou, C.D. Chase, J.W. Grosser and J.H. Graham, 2019. Novel plastid-nuclear genome combinations enhance resistance to citrus canker in cybrid grapefruit. Plant Biotechnol. J., Vol. 9. 10.3389/fpls.2018.01858.
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  26. Omar, A.A., M.M. Murata, H.A. El-Shamy, J.H. Graham and J.W. Grosser, 2018. Enhanced resistance to citrus canker in transgenic mandarin expressing Xa21 from rice. Transgenic Res., 27: 179-191.
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  27. Omar, A.A., A.H. Mohamed, M.I. Nasr, K.A.H. El-Halafawy, E.A.K. Alabsawy, A.I. Hamdi and E.M. Zayed, 2018. Molecular characterization of soybean (Glycine max L. Merr) genotypes tolerant and/or susceptible to cotton leaf worm (Spodoptera littoralis). Am. J. Biochem. Mol. Biol., 8: 34-47.
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  28. 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.
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  29. Omar, A.A., M. Murata, Q. Yu, F.G. Gmitter and C.D. Chase et al., 2017. Production of three new grapefruit cybrids with potential for improved citrus canker resistance. In Vitro Cell. Dev. Biol. Plant, 10.1007/s11627-017-9816-7.
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  30. Omar, A.A., A.M. Shohael and J.W. Grosser, 2017. Genetic transformation approaches to improve citrus greening tolerant/resistance in citrus trees. In Vitro Cell. Dev. Biol.-Plant, (In Press). .
  31. Killiny, N., M.F. Valim, S.E. Jones, A.A. Omar, F. Hijaz, F.G. Gmitter 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.
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  32. 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. Int. J. Dairy Sci., 12: 28-40.
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  33. 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. Am. J. Biochem. Mol. Biol., 7: 41-52.
  34. Omar, A.A., M.M. Mayara, Q. Yu, F.G. Gmitter, C.D. Chase, J.H. Graham and J.W. Grosser, 2016. Production of three new grapefruit like cybrids confirmed by plant mitochondrial intron, chloroplast and nuclear dna markers to improve citrus canker resistance. In Vitro Cell. Dev. Biol. Anim., 52: 32-41.
  35. Omar, A.A., M. Dutt, F.G. Gmitter and J.W. Grosser, 2016. Somatic Embryogenesis: Still a Relevant Technique in Citrus Improvement. In: In vitro Embryogenesis in Higher Plants, Germana, M.A. and M. Lambardi (Eds.). Chapter 13, Springer, New York, USA., ISBN: 978-1-4939-3060-9, pp: 289-327.
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  36. Murata, M.M., C.D. Chase, A.A. Omar, J.W. Grosser and J.H. Graham, 2016. Cybridization: A promising plant resistance for citrus canker control. Am. Phytopathologoical Soc., .
  37. 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. J. Agric. Vet. Sci., 9: 58-65.
  38. Zayed, E., M. Sayed and A. Omar, 2015. Genetic variations between two ecotypes of Egyptian clover by Inter-Simple Sequence Repeat (ISSR) techniques. Afr. J. Biotechnol., 14: 1947-1953.
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  39. Omar, A.A., S. Altaf, I.A. Khan and J.W. Grosser, 2015. Production of mandarin + Citrus latipes somatic hybrid citrus rootstocks with potential for improved tolerance/resistance to citrus greening. J. Citrus Pathol., 2: 33-39.
  40. Omar, A.A., M. Murata, S. Altaf, C.D. Chase, J.H. Graham and J.W. Grosser, 2015. Somatic hybridization and cybridization via protoplast fusion technology for citrus improvement. In Vitro Cell. Dev. Biol. Plant, 2015: 494-494.
  41. Soriano, L., M. Dutt, B. Madalena, J. Mendes, A.A. Omar and J.W. Grosser, 2014. Developmental regulation of the VvmybA1 transcriptional factor gene of grapevine (Vitisvinifera L.) to produce reporter gene expression free transgenic citrus. In Vitro Cell. Dev. Bio. Anim., 2014: 50-50.
  42. Omar, A.A., A. Satpute, M. Murata, C.D. Chase and J.W. Grosser, 2014. Production of three new grapefruit cybrids to improve citrus canker resistance. Hortic. Sci., 49: 234-234.
  43. Omar, A.A. and J.W. Grosser, 2014. Molecular characterization of transgenic W. Murcott (Nadorcott) mandarin produced using a protoplast-GFP transformation system. In Vitro Cell. Dev. Biol. Anim., 50: 51-51.
  44. Murata, M., C.D. Chase, A.A. Omar, J.W. Grosser and J.H. Graham, 2014. Plant mitochondira intron and chloroplast DNA markers confirm new grapfruitcybrids. Florida Genet., .
  45. Omar, A.A., A.M. Shohael and J.W. Grosser, 2012. Over expression of a β-1,3-glucanase gene in transgenic citrus in efforts to inhibit phloem plugging caused by citrus greening disease (Huanglongbing). Am. Soc. Hortic. Sci., .
  46. Grosser, J.W., A.A. Omar, J.A. Gmitter and J.P. Syvertsen, 2012. Salinity tolerance of Valencia orange trees on allotetraploid rootstocks. Proc. Florida State Hortic. Soc., 125: 50-55.
  47. Grosser, J.W., M. Dutt, A. Omar, V. Orbovic and G. Barthe, 2011. Progress Towards the Development of Transgenic Disease Resistance in Citrus. ISHS Acta Hortic., 892: 101-107.
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  48. Grosser, J.W. and A.A. Omar, 2011. Protoplasts-an Increasingly Valuable Tool in Plant Research. In: Plant Cell Culture, Development and Biotechnology, Trigiano, R.N. and D.J. Gray (Eds.). Taylor and Francis (CRC Press, LLC), Boca Raton, Florida, ISBN-13: 9781420083262,.
  49. Dutt, M., A. Omar, V. Orbovic, G. Barthe and J.W. Grosser, 2010. Progress towards incorporation of antimicrobial peptides for disease resistance in citrus. Biotechnol. Genomics, .
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  50. Omar, A.A., A.H. Mohamed and J.W. Grosser, 2009. Study of transgene expression by phloem specific promoter in transgenic citrus plant. J. Biol. Chem. Environ. Sci., 4: 647-661.
  51. Dutt, M., J.W. Grosser, A.A. Omar and G.A. Barthe, 2009. Multiple approaches for genetic engineering of citrus for disease and pest resistance. Hortscience, 44: 1008-1008.
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  52. 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.
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  53. 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.
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  54. 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. Progress, 24: 1241-1248.
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  55. Omar, A.A., M. Dutt, G. Barthe, V. Orbovic and J.W. Grosser, 2008. Phloem specific transgene expression driven by AtSUC2 gene promoter in transgenic citrus plants to develop citrus greening resistance. In vitro Cell. Dev. Biol., 44: S54-S54.
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  56. Omar, A.A., M. Calovic, H.A. El-Shamy, H.J. An and J.W. Grosser, 2008. Transformation and regeneration of transgenic `W. Murcott` (Nadorcott) mandarin using a protoplast-GFP transformation system. Hortscience, 43: 1155-1155.
  57. 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.
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  58. Dutt, M., A.A. Omar, V. Orbovic, G. Barthe and J. Gmitter et al., 2008. Combating huanglongbing and canker via genetic engineering of citrus. Proc. Fla. State Hort. Soc., 121: 124-129.
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  59. Omar, A.A., W.Y. Song and J.W. Grosser, 2007. Introduction of Xα21, a Xanthomonas-resistance gene from rice, into 'Hamlin' sweet orange [Citrus sinensis (L.) Osbeck] using protoplast- GFP co-transformation or single plasmid transformation. J. Hortic. Sci. Biotechnol., 82: 914-923.
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  60. Omar, A.A. and J.W. Grosser, 2007. Protoplast/GFP transformation system: Comparison between endoplasmic reticulum targeting and non-targeting GFP in transgenic citrus. In Vitro Cell. Dev. Biol-Anim., 43: S25-S25.
  61. 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.
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  62. 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. Egypt. J. Agron., 29: 85-100.
  63. Omar, A.A.S.M., 2006. Biotechnology and its uses in improvement of canker resistance in citrus trees. Hortic. Sci., .
  64. Omar, A.A., W.Y. Song, J.H. Graham and J.W. Grosser, 2006. Comparison between protoplast transformation and co-transformation in Hamlin sweet orange [Citrus sinensis (L.) osbeck]. Hortscience, 41: 972-973.
  65. Omar, A.A., M.G.H. Dekkers, J.H. Graham and J.W. Grosser, 2006. Quantitative multiplex real-time PCR as a screening tool for estimating transgene copy number in transgenic citrus. In vitro Cell. Dev. Biol. Anim., 42: 22-22.
  66. Omar, A.A. and J.W. Grosser, 2005. Transgenic Hamlin sweet orange plants containing a rice Xa21 cDNA gene obtained by protoplast/GFP transformation. In Vitro Cell. Dev. Biol-Anim., 41: 44-44.
  67. Omar, A.A. and J.W. Grosser, 2004. Transfer of cDNA of the Xa21 Xanthomonas resistance gene from rice into Hamlin sweet orange (Citrus sinensis L. Osbeck) using a protoplast/GFP transformation system. In vitro Cell. Dev. Biol. Anim., 40: 65-65.