Wound-induced RNaseLE expression is jasmonate and systemin independent and occurs only locally in tomato (Lycopersicon esculentum cv. Lukullus)

Phytochemistry
Nadine GrossMargret Köck

Abstract

Tomato RNaseLE is induced by phosphate deficiency and wounding and may play a role in macromolecular recycling as well as wound healing. Here, we analyzed the role of jasmonate and systemin in the wound-induced RNaseLE activation. The rapid expression of RNaseLE upon wounding of leaves leading to maximal RNase activity within 10 h, appeared only locally. Jasmonic acid (JA) or its molecular mimic ethyl indanoyl isoleucine conjugate did not induce RNaseLE expression. Correspondingly, RNaseLE was expressed upon wounding of 35S::allene oxide cyclase antisense plants known to be JA deficient. RNaseLE was not expressed upon systemin treatment, but was locally expressed in the spr1 mutant which is affected in systemin perception. In tomato plants carrying a PromLE::uidA construct, GUS activity could be detected upon wounding, but not following treatment with JA or systemin. The data indicate a locally acting wound-inducible systemin- and JA-independent signaling pathway for RNaseLE expression.

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Citations

Jul 9, 2008·Molecular Genetics and Genomics : MGG·Melissa S HillwigGustavo C Macintosh
Feb 26, 2010·Molecular Genetics and Genomics : MGG·Gustavo C MacIntoshLex Flagel
Mar 5, 2008·Plant Physiology·Jens Schwachtje, Ian T Baldwin
Dec 22, 2005·Journal of Plant Physiology·Claus WasternackOtto Miersch
Sep 20, 2017·PeerJ·Karolis Ramanauskas, Boris Igić
May 1, 2020·Molecular Plant Pathology·Naveen Kumar SinghAmnon Lers

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