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Title

Deciphering the hormonal signaling network behind the systemic resistance induced by Trichoderma harzianum in tomato

AuthorsMartínez Medina, Ainhoa; Fernández, Iván; Sánchez-Guzmán, María J.; Jung, Sabine C.; Pascual, Jose A.; Pozo, María J.
KeywordsBotrytis sp.
Induced systemic resistance
Jasmonic acid
Phytohormone
Priming
Signaling
Signaling
Tomato
Trichoderma sp.
Issue Date2013
PublisherFrontiers Media
CitationFrontiers in Plant Science
AbstractRoot colonization by selected Trichoderma isolates can activate in the plant a systemic defense response that is effective against a broad-spectrum of plant pathogens. Diverse plant hormones play pivotal roles in the regulation of the defense signaling network that leads to the induction of systemic resistance triggered by beneficial organisms [induced systemic resistance (ISR)]. Among them, jasmonic acid (JA) and ethylene (ET) signaling pathways are generally essential for ISR. However, Trichoderma ISR (TISR) is believed to involve a wider variety of signaling routes, interconnected in a complex network of cross-communicating hormone pathways. Using tomato as a model, an integrative analysis of the main mechanisms involved in the systemic resistance induced by Trichoderma harzianum against the necrotrophic leaf pathogen Botrytis cinerea was performed. Root colonization by T. harzianum rendered the leaves more resistant to B. cinerea independently of major effects on plant nutrition. The analysis of disease development in shoots of tomato mutant lines impaired in the synthesis of the key defense-related hormones JA, ET, salicylic acid (SA), and abscisic acid (ABA), and the peptide prosystemin (PS) evidenced the requirement of intact JA, SA, and ABA signaling pathways for a functional TISR. Expression analysis of several hormone-related marker genes point to the role of priming for enhanced JA-dependent defense responses upon pathogen infection. Together, our results indicate that although TISR induced in tomato against necrotrophs is mainly based on boosted JA-dependent responses, the pathways regulated by the plant hormones SA- and ABA are also required for successful TISR development.
Description12 p., 2 figuras
Publisher version (URL)https://doi.org/10.3389/fpls.2013.00206
URIhttp://hdl.handle.net/10261/180219
DOI10.3389/fpls.2013.00206
E-ISSN1664-462X
Appears in Collections:(IRNASA) Artículos
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