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9,10-KODA,an α-ketol produced by the tonoplastlocalized 9-lipoxygenase ZmLOX5,plays a signaling role in maize defense against insect herbivory

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Molecular Plant 2023年第8期16卷 1283-1303页

作者： Peiguo Yuan Eli Borrego Yong-Soon Park zachary gorman Pei-Cheng Huang Jordan Tolley Shawn A.Christensen Jantana Blanford Aruna Kilaru Robert Meeley Hisashi Koiwa Stefan Vidal Alisa Huffaker Eric Schmelz Michael V.Kolomiets Department of Plant Pathology and Microbiology Texas A&M UniversityCollege StationTX 77840-2132USA Currently at Thomas H.Gosnell School of Life Sciences Rochester Institute of TechnologyRochesterNY 14623USA Department of Horticultural Sciences Texas A&M UniversityCollege StationTX 77843USA College of Life Sciences Brigham Young UniversityProvoUT 84602USA Biology Department Brookhaven National LaboratoryUptonNY 11973USA Department of Biological Sciences East Tennessee State UniversityJohnson CityTN 37659USA Formerly at Corteva Agriscience JohnstonIA 50131USA Department of Crop Sciences Agricultural EntomologyGeorg-August-Universit€at37077 G€ottingenGermany Section of Cell and Developmental Biology University of California at San DiegoLa JollaCA 92037USA Department of Plant Resources Agriculture and Fisheries Life Science Research InstituteKongju National UniversityYesanChungnam 32439South Korea

13-Lipoxygenases(LOXs)initiate the synthesis of jasmonic acid(JA),the best-understood oxylipin hormone in herbivory ***,the roles of 9-LOX-derived oxylipins in insect resistance remain ***,we report a novel anti-herbivory mechanism mediated by a tonoplast-localized 9-LOX,ZmLOX5,and its linolenic acid-derived product,9-hydroxy-10-oxo-12(Z),15(Z)-octadecadienoic acid(9,10-KODA).Transposon-insertional disruption of ZmLOX5 resulted in the loss of resistance to insect ***5 knockout mutants displayed greatly reduced wound-induced accumulation of multiple oxylipins and defense metabolites,including benzoxazinoids,abscisic acid(ABA),and JA-isoleucine(JA-Ile).However,exogenous JA-Ile failed to rescue insect defense in lox5 mutants,while applications of 1 mM 9,10-KODA or the JA precursor,12-oxo-phytodienoic acid(12-OPDA),restored wild-type resistance *** profiling revealed that exogenous 9,10-KODA primed the plants for increased production of ABA and 12-OPDA,but not *** none of the 9-oxylipins were able to rescue JA-Ile induction,the lox5 mutant accumulated lower wound-induced levels of Ca^(2+),suggesting this as a potential explanation for lower wound-induced *** pretreated with 9,10-KODA exhibited rapid or more robust woundinduced defense gene *** addition,an artificial diet supplemented with 9,10-KODA arrested fall armyworm larvae ***,analysis of single and double lox5 and lox10 mutants showed that ZmLOX5 also contributed to insect defense by modulating ZmLOX10-mediated green leaf volatile ***,our study uncovered a previously unknown anti-herbivore defense and hormonelike signaling activity for a major 9-oxylipin α-ketol.

关键词： abscisic acid benzoxazinoids defense priming fall armyworm Spodoptera 12-oxo-phytodienoic

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