12-Oxo-Phytodienoic Acid Acts As a Regulator of Maize Defense Against Corn Leaf Aphid

Overview

Journal Plant Physiol

Specialty Physiology

Date 2019 Jan 16

PMID 30643012

Citations 27

Authors

Suresh Varsani

Sajjan Grover

Shaoqun Zhou

Kyle G Koch

Pei-Cheng Huang

Michael V Kolomiets

W Paul Williams

Tiffany Heng-Moss

Gautam Sarath

Dawn S Luthe

Georg Jander

Joe Louis

Affiliations

Soon will be listed here.

Abstract

The corn leaf aphid (CLA; ) is a phloem sap-sucking insect that attacks many cereal crops, including maize (). We previously showed that the maize inbred line Mp708, which was developed by classical plant breeding, provides enhanced resistance to CLA. Here, using electrophysiological monitoring of aphid feeding behavior, we demonstrate that Mp708 provides phloem-mediated resistance to CLA. Furthermore, feeding by CLA on Mp708 plants enhanced callose deposition, a potential defense mechanism utilized by plants to limit aphid feeding and subsequent colonization. In maize, benzoxazinoids (BX) or BX-derived metabolites contribute to enhanced callose deposition by providing heightened resistance to CLA. However, BX and BX-derived metabolites were not significantly altered in CLA-infested Mp708 plants, indicating BX-independent defense against CLA. Evidence presented here suggests that the constitutively higher levels of 12-oxo-phytodienoic acid (OPDA) in Mp708 plants contributed to enhanced callose accumulation and heightened CLA resistance. OPDA enhanced the expression of ethylene biosynthesis and receptor genes, and the synergistic interactions of OPDA and CLA feeding significantly induced the expression of the transcripts encoding Maize insect resistance1-Cysteine Protease, a key defensive protein against insect pests, in Mp708 plants. Furthermore, exogenous application of OPDA on maize jasmonic acid-deficient plants caused enhanced callose accumulation and heightened resistance to CLA, suggesting that the OPDA-mediated resistance to CLA is independent of the jasmonic acid pathway. We further demonstrate that the signaling function of OPDA, rather than a direct toxic effect, contributes to enhanced CLA resistance in Mp708.

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