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A Comparison of the Effects of FATTY ACID DESATURASE 7 and HYDROPEROXIDE LYASE on Plant–Aphid Interactions

1
Department of Entomology, University of Arkansas, Fayetteville, AR 72701, USA
2
Department of Horticultural Sciences, Texas A&M AgriLife Research, Weslaco, TX 78596, USA
3
Horticultural Sciences Department, University of Florida, Gainesville, FL 32611, USA
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2018, 19(4), 1077; https://doi.org/10.3390/ijms19041077
Received: 18 February 2018 / Revised: 31 March 2018 / Accepted: 1 April 2018 / Published: 4 April 2018
(This article belongs to the Special Issue Plant Innate Immunity 2.0)
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Abstract

The spr2 mutation in tomato (Solanum lycopersicum), which disrupts function of FATTY ACID DESATURASE 7 (FAD7), confers resistance to the potato aphid (Macrosiphum euphorbiae) and modifies the plant’s C6 volatile profiles. To investigate whether C6 volatiles play a role in resistance, HYDROPEROXIDE LYASE (HPL), which encodes a critical enzyme in C6 volatile synthesis, was silenced in wild-type tomato plants and spr2 mutants. Silencing HPL in wild-type tomato increased potato aphid host preference and reproduction on 5-week old plants but had no influence on 3-week old plants. The spr2 mutation, in contrast, conferred strong aphid resistance at both 3 and 5 weeks, and silencing HPL in spr2 did not compromise this aphid resistance. Moreover, a mutation in the FAD7 gene in Arabidopsis thaliana also conferred resistance to the green peach aphid (Myzus persicae) in a genetic background that carries a null mutation in HPL. These results indicate that HPL contributes to certain forms of aphid resistance in tomato, but that the effects of FAD7 on aphids in tomato and Arabidopsis are distinct from and independent of HPL. View Full-Text
Keywords: aphid resistance; Arabidopsis thaliana; hydroperoxide lyase; Macrosiphum euphorbiae; Myzus persicae; Solanum lycopersicum; ω-3 fatty acid desaturase aphid resistance; Arabidopsis thaliana; hydroperoxide lyase; Macrosiphum euphorbiae; Myzus persicae; Solanum lycopersicum; ω-3 fatty acid desaturase
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Li, J.; Avila, C.A.; Tieman, D.M.; Klee, H.J.; Goggin, F.L. A Comparison of the Effects of FATTY ACID DESATURASE 7 and HYDROPEROXIDE LYASE on Plant–Aphid Interactions. Int. J. Mol. Sci. 2018, 19, 1077.

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