Genomics, Transcriptomics, And Beyond: The Fifteen Years Of Cacao’s Witches’ Broom Disease Genome Project

Cacao production in Brazil was severely affected by the outbreak of witches’ broom disease (WBD) in the late 1980s. WBD is caused by the basidiomycete fungus Moniliophthora perniciosa, a hemibiotrophic pathogen that displays an uncommonly long-lasting biotrophic stage during which the host cacao suffers intense morphologic alterations in the infected shoots, giving rise to “green brooms.” Two months after infection, the fungus becomes necrotrophic resulting in the necrosis and destruction of the infected tissues that turn into a “dry broom.” During the last 15 years, the knowledge of this devastating and intriguing disease has been growing due to initiatives such as the WBD genome project. By using genomics and transcriptomics as tools to obtain insights about this disease, the WBD project has been elucidating the biochemistry and physiology of both plant host and pathogen, paving the way for practical applications to combat the fungus. In this chapter we present an overview of progress in the understanding of M. perniciosa genetics and the molecular mechanisms governing WBD, provide a model for the M. perniciosa–cacao interaction, and point to new directions to fight this disease. © Springer International Publishing Switzerland 2016.17921

High-resolution Transcript Profiling Of The Atypical Biotrophic Interaction Between Theobroma Cacao And The Fungal Pathogen Moniliophthora Perniciosa

Witches’ broom disease (WBD), caused by the hemibiotrophic fungus Moniliophthora perniciosa, is one of the most devastating diseases of Theobroma cacao, the chocolate tree. In contrast to other hemibiotrophic interactions, the WBD biotrophic stage lasts for months and is responsible for the most distinctive symptoms of the disease, which comprise drastic morphological changes in the infected shoots. Here, we used the dual RNA-seq approach to simultaneously assess the transcriptomes of cacao and M. perniciosa during their peculiar biotrophic interaction. Infection with M. perniciosa triggers massive metabolic reprogramming in the diseased tissues. Although apparently vigorous, the infected shoots are energetically expensive structures characterized by the induction of ineffective defense responses and by a clear carbon deprivation signature. Remarkably, the infection culminates in the establishment of a senescence process in the host, which signals the end of the WBD biotrophic stage. 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