Abstract
Embryogenic cell suspensions of triploid East African Highland bananas (Musa AAA-EA) were initiated and generated using cooking cultivar ‘Nakyetengu’ belonging to the Nakabululu clone set. Immature male flowers produced embryogenic calli consisting of embryos and friable tissue after 4 mo culture on a modified MA1 callus induction medium. Friable calli were initiated and maintained in liquid MA2 medium. A cell growth rate of 1.5–2.0 sedimented cell volume (SCV) per month was observed. Embryo development was observed at 2.18 × 103 embryos per mL SCV. Germination of these embryos was observed at 2.8% and 6.2% for two cell suspension lines. Plant regeneration efficiency was 60–100%, all producing normal plants with a shoot and roots at weaning. In the field, somatic cell-derived plants were all normal morphology and comparable to control plants during vegetative and reproductive stages. This study is a breakthrough for recalcitrant East African Highland banana and offers a system that can provide essential raw materials for associated germplasm improvement through genetic engineering approaches.
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We acknowledge the Rockefeller Foundation for funding this work through the National Banana Research Program of National Agricultural Research Organization, Uganda.
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Namanya, P., Mutumba, G., Magambo, S.M. et al. Developing a cell suspension system for Musa-AAA-EA cv. ‘Nakyetengu’: a critical step for genetic improvement of Matooke East African Highland bananas. In Vitro Cell.Dev.Biol.-Plant 50, 442–450 (2014). https://doi.org/10.1007/s11627-014-9598-0
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DOI: https://doi.org/10.1007/s11627-014-9598-0