The Taiwan Banana Genome Studies Reveal Breeding Solutions to Combat Fusarium Wilt

Fusarium wilt has long threatened the global banana industry. Because most edible banana cultivars are sterile triploids, conventional breeding is difficult and often fails to deliver new cultivars acceptable to farmers and consumers. Through mutation induction via tissue culture combined with field selection, the Taiwan Banana Research Institute (TBRI) has successfully developed several commercial cultivars with resistance to Fusarium wilt, including ‘Tai-Chiao No. 5’, ‘Tai-Chiao No. 7’, and ‘Formosana’. These resistant cultivars have become critical resources for disease management in Taiwan and other banana-producing countries，but the genetic basis of their resistance has remained unclear. We employed genomic, transcriptomic, and functional analyses to comprehensively dissect the key differences between resistant lines and their susceptible progenitor, ‘Pei-Chiao’. The study found that resistant lines harbor large deletions on chromosome 4 or chromosome 5, resulting in reduced copy numbers of two autoinhibited Ca2+ ATPase genes. These calcium pumps function as negative regulators in salicylic acid–mediated immune responses. Using a virus-induced gene silencing system developed by Dr. Yeh’s team, suppression of these genes in the susceptible line enhanced salicylic acid–mediated immunity and significantly mitigated disease symptoms, confirming that the two genes act as critical susceptibility genes in banana. This work highlights the important role of chromosomal structural variation in banana mutation breeding and provides actionable genomic targets for precision breeding of disease-resistant cultivars.

Co-researchers:Puyam Tondonba Singh, Bo-Han Hou, Yi-Heng Tsai, Yuh Tzean, Chih-Ping Chao, Po-Xing Zheng, Yao-Cheng Lin, Wei-Chiang Shen, Hsin-Hung Yeh