Genetically Modified Bananas Show Resistance to Fungal Threats

Overview of Banana Cultivation Challenges

Recent field trials have demonstrated that new genetically modified bananas possess the ability to withstand a destructive fungus that has impacted banana crops globally. The Cavendish variety, which accounts for over 40% of the world’s banana production, was extensively cultivated beginning in the 1950s due to the severe damage caused by Fusarium oxysporum f. sp. cubense (Foc race 1), leading to widespread Fusarium wilt in banana plantations throughout Latin America.

The Emergence of Tropical Race 4

In the 1990s, a new strain of the fungus, known as tropical race 4 (TR4), emerged, posing a significant threat to the Cavendish banana, the most widely consumed banana variety worldwide.

Research Developments at Queensland University of Technology

Researchers from the Queensland University of Technology in Brisbane, Australia, have made significant strides in developing multiple lines of genetically modified bananas that can resist TR4 infection. Their findings were published in the journal Nature Communications.

Methodology and Findings

The research team created one set of disease-resistant banana lines by integrating the Ced9 anti-apoptosis gene from the worm Caenorhabditis elegans into the Cavendish variety. They developed another set by inserting the RGA2 resistance gene from a different banana variety. Field trials conducted over three years in a region southeast of Darwin, Australia, where TR4 is prevalent, revealed that 67% of the control plants succumbed to the disease, while approximately 80% of the transgenic plants exhibited no symptoms. Notably, two lines, one with the RGA2 gene and the other with the Ced9 gene, demonstrated complete resistance to the fungus.

Implications for Cavendish Banana Cultivation

These results mark a crucial advancement in safeguarding the future of Cavendish banana cultivation. The researchers aim to conduct further extensive trials to identify lines that could be viable for commercial farming.

Challenges Ahead for Genetic Modification Acceptance

Despite these promising developments, the widespread acceptance and adoption of genetically modified bananas remain uncertain due to general reservations surrounding genetically modified crops. Nevertheless, plant breeders may embrace insights from this research to develop new fungus-resistant varieties of Cavendish bananas.

References

1) Dale J, James A, Paul JY, Khanna H, Smith M, Peraza-Echeverria S, Garcia-Bastidas F, Kema G, Waterhouse P, Mengersen K, Harding R. Transgenic Cavendish bananas with resistance to Fusarium wilt tropical race 4. Nat Commun. 2017 Nov 14;8(1):1496. doi: 10.1038/s41467-017-01670-6. PubMed PMID: 29133817; PubMed Central PMCID: PMC5684404.
2) Stokstad E. GM banana shows promise against deadly fungus strain. http://www.sciencemag.org/news/2017/11/gm-banana-shows-promise-against-deadly-fungus-strain. Published November 17, 2017. Accessed December 04, 2017.

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