Induction and recovery of copy number variation in banana through gamma irradiation and low-coverage whole-genome sequencing.

Abstract:

:Traditional breeding methods are hindered in bananas due to the fact that major cultivars are sterile, parthenocarpic, triploid and thus clonally propagated. This has resulted in a narrow genetic base and limited resilience to biotic and abiotic stresses. Mutagenesis of in vitro propagated bananas is one method to introduce novel alleles and broaden genetic diversity. We previously established a method for the induction and recovery of single nucleotide mutations generated with the chemical mutagen EMS. However, officially released mutant banana varieties have been created using gamma rays, a mutagen that can produce large genomic insertions and deletions (indels). Such dosage mutations may be important for generating observable phenotypes in polyploids. In this study, we establish a low-coverage whole-genome sequencing approach in triploid bananas to recover large genomic indels caused by treatment with gamma irradiation. We first evaluated the commercially released mutant cultivar 'Novaria' and found that it harbours multiple predicted deletions, ranging from 0.3 to 3.8 million base pairs (Mbp). In total, predicted deletions span 189 coding regions. To evaluate the feasibility of generating and maintaining new mutations, we developed a pipeline for mutagenesis and screening for copy number variation in Cavendish bananas using the cultivar 'Williams'. Putative mutations were recovered in 70% of lines treated with 20 Gy and 60% of the lines treated with 40 Gy. While deletion events predominate, insertions were identified in 20 Gy-treated material. Based on these results, we believe this approach can be scaled up to support large breeding projects.

journal_name

Plant Biotechnol J

authors

Datta S,Jankowicz-Cieslak J,Nielen S,Ingelbrecht I,Till BJ

doi

10.1111/pbi.12901

subject

Has Abstract

pub_date

2018-02-24 00:00:00

eissn

1467-7644

issn

1467-7652

pub_type

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