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An efficient Agrobacterium tumefaciens-mediated genetic transformation of “Egusi” melon (Colocynthis citrullus L.)

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Abstract

Cotyledonary explants of two “Egusi” genotypes, ‘Ejagham’ and NHC1-130, were co-cultivated with Agrobacterium tumefaciens strain EHA101 carrying either plasmid pIG121-Hm harbouring genes coding for beta-glucuronidase (gus), hygromycin phosphotransferase (hpt) and neomycin phosphotransferase II (nptII) or plasmid pBBRacdS harbouring these same genes along with a gene coding for 1-aminocyclopropane-1-carboxylate (ACC) deaminase. Six weeks after co-cultivation, more than 35% of explants produced shoots in both cultivars. A DNA fragment corresponding to the gus gene or the selection marker nptII was amplified from genomic DNA extracted from leaves of regenerated plant clones rooted on hormone-free MS medium containing 100 mg/l kanamycin, suggesting their transgenic nature. Southern blot analysis confirmed successful integration of one to three copies of the gus gene. Transformation efficiencies of cultivar NHC1-130 with EHA101(pIG121-Hm) and EHA101(pIG121-Hm, pBBRacdS) were 3.8% and 10%, respectively, which were higher than those obtained for cultivar ‘Ejagham’ of 2.4% and 5.7%, respectively. Co-cultivation medium containing 5 mg/l BA was effective for obtaining high transformation efficiency for both cultivars as compared with that without it.

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Abbreviations

BA:

Benzylaminopurine

GUS:

β-Glucuronidase

MS:

Murashige and Skoog

NPTII:

Neomycin phosphotransferase

PCR:

Polymerase chain reaction

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Correspondence to Masahiro Mii.

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Ntui, V.O., khan, R.S., Chin, D.P. et al. An efficient Agrobacterium tumefaciens-mediated genetic transformation of “Egusi” melon (Colocynthis citrullus L.). Plant Cell Tiss Organ Cult 103, 15–22 (2010). https://doi.org/10.1007/s11240-010-9748-y

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