@ARTICLE{TreeBASE2Ref20685, author = {Anna Karoline Silva Fausto and Maite Freitas Silva Vaslin}, title = {New Report of Cotton Blue Disease Resistance-Breaking in Cotton Crops in Brazil.}, year = {2012}, keywords = {Cotton blue disease, CBD, CLRDV, cotton, Gossypium hirsutum, resistance-breaking}, doi = {}, url = {http://}, pmid = {}, journal = {European Journal of Plant Pathology}, volume = {}, number = {}, pages = {}, abstract = {Cotton blue disease (CBD) is an important biotic pathology that affects cotton crops in Asia, South America and Africa. In Brazil it is present in almost all the producer cotton crop areas, leading to important losses in the productivity by up to 80%, mainly in crops planted with susceptible varieties.. The disease is caused by a member of the family Luteoviridae, genus Polerovirus, named Cotton leafroll dwarf virus (CLRDV). Since 2006 some resistant cotton cultivars plants begins to show CBD-like symptoms and during 2007/08 harvest cotton producer observed this phenomenon in the cultivar FMT701, a resistant cv. that represented about 70% of cotton crops this season. In this work, CLRDV molecular diagnosis was assayed in twenty-one FMT701 plants collected in Rondonopólis and Primavera do Leste, in the state of Mato Grosso during 2008 harvest. Positive diagnostic for CLRDV virus in eighteen symptomatic and asymptomatic plants were obtained. Sequencing of the polymerase and intergenic region amplification products confirmed the presence of CLRDV, and reveal that these new CLRDV isolates have an aa substitution in MP protein found already in CLRDV breaking-resistance isolates described earlier. These results show the occurrence of CBD resistance-breaking event by pathogen alteration in one of the most important cotton varieties for Brazilian cotton crop. As the CBD resistance genetic background of cv. FMT701 is the same of others important cotton cultivars planted in others parts of the word, this pathogen ability to overcome host resistance may have important damage consequences for cotton crops over the world. Ours results highlight the need of new breeding programs aiming to supplant these events and monitoring programs to limit it occurrence.} }

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