World first: Bacteria isolated that could halt crop diseases

In a world-first breakthrough, scientists have identified a soil bacterium that can break down fusaric acid, a potent toxin produced by Fusarium fungi that causes significant crop losses worldwide. This discovery holds immense promise for developing eco-friendly and effective methods to protect agriculture.

Fusarium fungi, particularly Fusarium oxysporum, inflict millions of dollars in damage annually by infecting various plant species. Their destructive power is largely attributed to the production of fusaric acid. Existing control methods, such as fungicides, are often inefficient and carry a heavy environmental burden. Alternative strategies, like developing resistant crops, can be costly and lose effectiveness over time.

Researchers from Fauba and Conicet have isolated a bacterium from the Burkholderia genus that actively degrades fusaric acid. This remarkable strain utilizes the mycotoxin as its exclusive source of carbon, nitrogen, and energy for growth. The team has already identified key genes and enzymes involved in this degradation process.

Experiments demonstrated the bacterium's effectiveness: when applied to barley seeds treated with fusaric acid, the seedlings developed normally. The toxin typically inhibits root and leaf development, but the bacterial treatment completely reversed these negative effects. This finding opens doors for innovative biological control applications with minimal ecological consequences.