Terpene Down-Regulation Triggers Defense Responses in Transgenic Orange Leading to Resistance against Fungal Pathogens
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Other documents of the author: Rodríguez, Ana; Shimada, Takehiko; Alquézar, Berta; Gadea, José; Gomez-Cadenas, Aurelio; de Ollas, Carlos; Rodrigo, María Jesús; Zacarías, Lorenzo; Peña, Leandro; Cervera, Magdalena
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http://dx.doi.org/10.1104/pp.113.224279 |
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Title
Terpene Down-Regulation Triggers Defense Responses in Transgenic Orange Leading to Resistance against Fungal PathogensAuthor (s)
Date
2014Publisher
American Society of Plant BiologistsISSN
0032-0889; 1532-2548Type
info:eu-repo/semantics/articlePublisher version
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3875811/pdf/321.pdfAbstract
Terpenoid volatiles are isoprene compounds that are emitted by plants to communicate with the environment. In addition to
their function in repelling herbivores and attracting carnivorous predators in green tissues, ... [+]
Terpenoid volatiles are isoprene compounds that are emitted by plants to communicate with the environment. In addition to
their function in repelling herbivores and attracting carnivorous predators in green tissues, the presumed primary function of
terpenoid volatiles released from mature fruits is the attraction of seed-dispersing animals. Mature oranges (Citrus sinensis)
primarily accumulate terpenes in peel oil glands, with D-limonene accounting for approximately 97% of the total volatile
terpenes. In a previous report, we showed that down-regulation of a D-limonene synthase gene alters monoterpene levels in
orange antisense (AS) fruits, leading to resistance against Penicillium digitatum infection. A global gene expression analysis of AS
versus empty vector (EV) transgenic fruits revealed that the down-regulation of D-limonene up-regulated genes involved in the
innate immune response. Basal levels of jasmonic acid were substantially higher in the EV compared with AS oranges. Upon
fungal challenge, salicylic acid levels were triggered in EV samples, while jasmonic acid metabolism and signaling were
drastically increased in AS orange peels. In nature, D-limonene levels increase in orange fruit once the seeds are fully viable.
The inverse correlation between the increase in D-limonene content and the decrease in the defense response suggests that
D-limonene promotes infection by microorganisms that are likely involved in facilitating access to the pulp for seed-dispersing
frugivores. [-]
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Plant Physiology , January 2014, Vol. 164, pp. 321–339Rights
© 2013 American Society of Plant Biologists. All Rights Reserved.
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