Production of friable embryogenic callus and regeneration of Ugandan farmer-preferred cassava genotypes

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dc.contributor.authorApio, Hellen B.
dc.contributor.authorAlicai, Titus
dc.contributor.authorBaguma, Yona
dc.contributor.authorMukasa, Settumba B.
dc.contributor.authorBua, Anton
dc.contributor.authorTaylor, Nigel
dc.date.accessioned2022-02-15T21:16:19Z
dc.date.available2022-02-15T21:16:19Z
dc.date.issued2015
dc.description.abstractGeneration of embryogenic callus is a key step in genetic engineering of many crop species, including cassava. Protocols for generation of friable embryogenic callus (FEC) have been lacking for Ugandan cassava genotypes, thereby delaying their genetic engineering for agronomic and other desirable traits. The objective of this study was to determine conditions suitable for production and regeneration of FEC in the Ugandan cassava genotypes; Aladu, Bukalasa and Ebwanateraka, and control cultivar 60444. Immature leaf lobe explants were established on Murashige and Skoog (MS) based media for initiation of organized embryogenic callus (OES). To produce FEC, resulting OES were established on Gresshoff and Doy based callus induction media with varying levels of sucrose, maltose, tyrosine, tryptophan, naphthalene acetic acid (NAA) under light and dark conditions. Subsequently, FEC was subcultured to MS-based embryo maturation and embryo regeneration media. All genotypes produced OES. All genotypes produced FEC except Bukalasa. The amino acid tyrosine favoured production of FEC in Aladu and Ebwanatereka, but not in 60444, while 20 g/L of sucrose trigged production of FEC in Aladu and 60444, but 40 g/L of sucrose was superior for Ebwanatereka. Media supplemented with 1 ml/L naphthalene acetic acid NAA facilitated embryo regeneration in Ebwanatereka and 60444, while Aladu responded better to 5 ml/L NAA. Light, tyrosine and sucrose were essential for FEC production in Uganda cultivars while NAA was required for regeneration of somatic embryos. Ability to produce FEC in these genotypes lays a foundation for their improvement through genetic transformation for the desired and agronomic traits.en_US
dc.identifier.citationApio, H. B., Alicai, T., Baguma, Y., Mukasa, S. B., Bua, A., & Taylor, N. (2015). Production of friable embryogenic callus and regeneration of Ugandan farmer-preferred cassava genotypes. African Journal of Biotechnology, 14(22), 1854-1864. DOI: 10.5897/AJB2014.14364en_US
dc.identifier.issn1684-5315
dc.identifier.other10.5897/AJB2014.14364
dc.identifier.urihttps://nru.uncst.go.ug/xmlui/handle/123456789/2165
dc.language.isoenen_US
dc.publisherAfrican Journal of Biotechnologyen_US
dc.subjectCassava (Manihot esculenta Crantz)en_US
dc.subjectSomatic embryogenesisen_US
dc.subjectAmino acidsen_US
dc.subjectCarbon sourcesen_US
dc.titleProduction of friable embryogenic callus and regeneration of Ugandan farmer-preferred cassava genotypesen_US
dc.typeArticleen_US
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