Scientists from Texas A&M AgriLife Research have developed a groundbreaking method to combat citrus greening and potato zebra chip diseases, two major threats to U.S. agriculture. Their approach harnesses spinach-derived antimicrobial peptides, known as defensins, which naturally protect plants from pathogens. Published in the Plant Biotechnology Journal, the study shows promising results in improving crop yields and quality.
The research, led by Dr. Kranthi Mandadi, utilized spinach defensins to target the bacteria responsible for citrus greening and zebra chip disease. These peptides, already deemed safe for human consumption by the U.S. Environmental Protection Agency (EPA), were delivered to citrus trees using a benign virus developed by collaborators at the University of Florida. A simple grafting procedure allowed the virus to introduce the defensins directly to the infected areas.
In citrus trees affected by Candidatus Liberibacter asiaticus, the treatment led to a 50% increase in fruit yield after just one application. Similarly, potatoes treated with the peptides showed fewer disease symptoms, reduced bacterial presence, and higher tuber numbers compared to untreated plants.
Dr. Mandadi emphasized the potential of this innovation: “This is just the beginning. These peptides could become a broad-spectrum treatment for various crop diseases, complementing traditional agricultural practices.”
Dr. Amir Ibrahim, AgriLife Research’s chief scientific officer, praised the work: “Dr. Mandadi’s pioneering research exemplifies our commitment to scientific solutions that enhance agricultural resilience and food security.”
The study highlights the significant potential of spinach defensins as a sustainable and safe solution for combating hard-to-treat plant diseases. Future research will explore combining multiple peptides and integrating them with other management strategies to further protect crops. This advancement could mark a turning point in global agricultural disease control.
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