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Photo: https://gd.eppo.int/ Verticillium wilt in cotton
An international research team has identified a genomic region in the pathogenic fungus Verticillium dahliae responsible for producing a specific protein that the pathogen releases during the infection process, reports AgroPages.
This protein causes leaf drop in host plants and determines the pathogen’s virulence.
It is noted that the most virulent strains of Verticillium dahliae, the pathogenic fungus that causes Verticillium wilt, lead to complete leaf loss (defoliation). This results in the death of affected plants and, consequently, significant crop losses. (In Ukraine, this disease primarily affects sunflowers, while scientists studied pathogens most common in olives and cotton — ed.).
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Until now, the genetic mechanisms by which Verticillium dahliae causes this leaf drop were unknown.
“The gene for the leaf-drop-inducing protein was found on a so-called ‘Starship’. These are huge mobile genetic elements that can be transferred between different fungal species and carry genes, including the gene responsible for leaf drop. Genetic analyses revealed remnants of a putative ‘Starship’ carrying the leaf-drop gene in several other wilt-inducing fungi,” explains Professor Bart Thomma.
Understanding the genetic mechanisms by which Verticillium dahliae causes such an aggressive disease could facilitate the development of new methods for plant disease control — through improved, specific detection of the most aggressive isolated strains, as well as through breeding or genetic modification of resistant plants.
Alla Husarova, SuperAgronom.com
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