Pre-selection of banana somaclones resistant to Fusarium oxysporum f. sp. cubense, subtropical race 4. (September 2021)

• Record Type: Journal Article
• Authors: Rebouças, Tamyres Amorim; de Jesus Rocha, Anelita; Cerqueira, Tamires Sousa; Adorno, Poliana Ramalho; Barreto, Rafael Queiroz; Ferreira, Mileide dos Santos; Morais Lino, Lucymeire Souza; Batista de Oliveira Amorim, Vanusia; Almeida dos Santos-Serejo, Janay; Haddad, Fernando; Ferreira, Claudia Fortes; Amorim, Edson Perito
• Is Part Of: Crop protection. Volume 147(2021)
• Publication Date: 2021-09
• Subjects: Musa species -- Genetic improvement -- Somaclonal variation -- Plant health; Plants, Protection of -- Periodicals; 632.05
• DOI: 10.1016/j.cropro.2021.105692
• Languages: English
• ISSNs: 0261-2194

Abstract

Abstract: – Fusarium wilt, caused by Fusarium oxysporum f. sp. cubense (Foc), is one of the most destructive diseases affecting banana crops worldwide. Therefore, the development of resistant cultivars is a promising alternative to mitigate the effects of the disease on banana plantations. The objectives of this study were to induce somaclonal variation in banana cultivars of the Silk and Cavendish types and to select somaclones resistant to subtropical race 4, thereby enabling the production of fruit in areas where this race is present. Shoot clump apexes of the Grand Naine and Maçã (Silk) cultivars were grown in MS medium. The cultures were subcultured four times. They were then challenged with fusaric acid (FA) in an experiment consisting of four treatments with different concentrations (0.1, 0.2, 0.3, and 0.4 mM) and five repetitions, each consisting of a Petri dish containing seven multiple shoot clumps in MS culture medium supplemented with 2.5 mg/L benzylamine purine. Multiple shoot clumps without the addition of FA were also used in the experiment, and were subcultured three times and maintained in a dark room. The multiple shoot clumps that survived the treatment with FA were transferred to MS medium and maintained in the growth chamber in the presence of light. The regenerated plants were later planted in tanks containing soil infested with an isolate classified as Foc subtropical race 4 (Foc STR4), and were evaluated for resistance to the pathogen at 90 days after inoculation (d.a.i.). Pathogen structures were confirmed by root clarification and root staining technique. All somaclones of the Maçã (Silk) cultivar were susceptible to Fusarium wilt and two somaclones of the Grand Naine cultivar were selected as resistant. The addition of FA as a selective agent was effective in the selection of somaclones among plants of the Grand Naine cultivar, as shown by the selection of two somaclones resistant to Foc STR4. The next step will consist of the agronomic and market potential validation of the selected somaclones, aiming to confirm their potential use by producers. Highlights: Fusarium wilt most destructive disease affecting banana worldwide. Resistant cultivars is a promising alternative. Somaclonal variation is an interesting tool for breeding. Two somaclones of the Grand Naine were selected as resistant. Next step will consist of the agronomic and market potential validation of the selected somaclones.