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Partial Activation of SA- and JA-Defensive Pathways in Strawberry upon Colletotrichum acutatum Interaction

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Author
Amil-Ruiz, Francisco
Garrido-Gala, José
Gadea, José
Blanco Portales, Rosario
Muñoz-Mérida, Antonio
Trelles, Oswaldo
Santos, Berta de los
Arroyo, Francisco T.
Aguado-Puig, Ana
Romero, Fernando
Mercado, José-Ángel
Pliego-Alfaro, Fernando
Muñoz-Blanco, Juan
Caballero Repullo, José Luis
Publisher
Frontiers in
Date
2016
Subject
Colletotrichum acutatum
Fragaria × ananassa
Quantification of gene expression
Salicylic and jasmonic acid
Strawberry defense response
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Abstract
Understanding the nature of pathogen host interaction may help improve strawberry (Fragaria × ananassa) cultivars. Plant resistance to pathogenic agents usually operates through a complex network of defense mechanisms mediated by a diverse array of signaling molecules. In strawberry, resistance to a variety of pathogens has been reported to be mostly polygenic and quantitatively inherited, making it difficult to associate molecular markers with disease resistance genes. Colletotrichum acutatum spp. is a major strawberry pathogen, and completely resistant cultivars have not been reported. Moreover, strawberry defense network components and mechanisms remain largely unknown and poorly understood. Assessment of the strawberry response to C. acutatum included a global transcript analysis, and acidic hormones SA and JA measurements were analyzed after challenge with the pathogen. Induction of transcripts corresponding to the SA and JA signaling pathways and key genes controlling major steps within these defense pathways was detected. Accordingly, SA and JA accumulated in strawberry after infection. Contrastingly, induction of several important SA, JA, and oxidative stress-responsive defense genes, including FaPR1-1, FaLOX2, FaJAR1, FaPDF1, and FaGST1, was not detected, which suggests that specific branches in these defense pathways (those leading to FaPR1-2, FaPR2-1, FaPR2-2, FaAOS, FaPR5, and FaPR10) were activated. Our results reveal that specific aspects in SA and JA dependent signaling pathways are activated in strawberry upon interaction with C. acutatum. Certain described defense-associated transcripts related to these two known signaling pathways do not increase in abundance following infection. This finding suggests new insight into a specific putative molecular strategy for defense against this pathogen.
URI
http://hdl.handle.net/10396/15753
Fuente
Frontiers in Plant Science, 7: 1036 (2016)
Versión del Editor
https://dx.doi.org/10.3389/fpls.2016.01036
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