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2016 ; 5
(1
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Defense Priming and Jasmonates: A Role for Free Fatty Acids in Insect
Elicitor-Induced Long Distance Signaling
#MMPMID27135225
Li T
; Cofer T
; Engelberth M
; Engelberth J
Plants (Basel)
2016[Jan]; 5
(1
): ä PMID27135225
show ga
Green leaf volatiles (GLV) prime plants against insect herbivore attack resulting
in stronger and faster signaling by jasmonic acid (JA). In maize this response is
specifically linked to insect elicitor (IE)-induced signaling processes, which
cause JA accumulation not only around the damage site, but also in distant
tissues, presumably through the activation of electrical signals. Here, we
present additional data further characterizing these distal signaling events in
maize. Also, we describe how exposure to GLV increases free fatty acid (fFA)
levels in maize seedlings, but also in other plants, and how increased fFA levels
affect IE-induced JA accumulation. Increased fFA, in particular ?-linolenic acid
(LnA), caused a significant increase in JA accumulation after IE treatment, while
JA induced by mechanical wounding (MW) alone was not affected. We also identified
treatments that significantly decreased certain fFA level including simulated
wind and rain. In such treated plants, IE-induced JA accumulation was
significantly reduced when compared to un-moved control plants, while MW-induced
JA accumulation was not significantly affected. Since only IE-induced JA
accumulation was altered by changes in the fFA composition, we conclude that
changing levels of fFA affect primarily IE-induced signaling processes rather
than serving as a substrate for JA.