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T etranychus urticae ‐triggered responses promote genotype‐dependent conspecific repellence or attractiveness in citrus
Author(s) -
Agut Blas,
Gamir Jordi,
Jaques Josep A.,
Flors Victor
Publication year - 2015
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.13357
Subject(s) - tetranychus urticae , biology , botany , jasmonic acid , orange (colour) , cleopatra , horticulture , mite , salicylic acid , biochemistry
Summary The citrus rootstocks sour orange and Cleopatra mandarin display differential resistance against Tetranychus urticae . Sour orange plants support reduced oviposition, growth rates and damage compared with Cleopatra mandarin plants. Jasmonic acid signalling and flavonoid accumulation have been revealed as key mechanisms for the enhanced resistance of sour orange plants. In this study, we observed that the release of T. urticae herbivore‐induced plant volatiles ( HIPV s) from sour orange plants has a marked repellent effect on conspecific mites associated with the production of the terpenes α‐ocimene, α‐farnesene, pinene and d ‐limonene, and the green leaf volatile 4‐hydroxy‐4‐methyl‐2‐pentanone. By contrast, T. urticae HIPV s from Cleopatra mandarin plants promote conspecific mite attraction associated with an increase in (2 ‐ butoxyethoxy) ethanol , benzaldehyde and methyl salicylate levels. HIPV s released from sour orange plants following T. urticae infestation induce resistance in Cleopatra mandarin plants, thereby reducing oviposition rates and stimulating the oxylipin biosynthetic gene lipoxygenase2 ( LOX 2). Cleopatra HIPV s do not affect the response to T. urticae of these rootstocks. We conclude that sour orange plants promote herbivore‐induced resistance in Cleopatra mandarin plants and, despite the weak basal resistance of these rootstocks, herbivore resistance can be induced through the combination of HIPV s, such as α‐ocimene and d ‐limonene.