An herbivore elicitor activates the gene for indole emission in maize

被引:218
作者
Frey, M
Stettner, C
Paré, PW
Schmelz, EA
Tumlinson, JH
Gierl, A
机构
[1] Tech Univ Munich, Lehrstuhl Genet, D-85747 Garching, Germany
[2] Texas Tech Univ, Dept Chem & Biochem, Lubbock, TX 79409 USA
[3] ARS, Ctr Med Agr & Vet Entomol, USDA, Gainesville, FL 32608 USA
关键词
D O I
10.1073/pnas.260499897
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Maize and a variety of other plant species release volatile compounds in response to herbivore attack that serve as chemical cues to signal natural enemies of the feeding herbivore. N-(17-hydroxy-linolenoyl)-L-glutamine is an elicitor component that has been isolated and chemically characterized from the regurgitant of the herbivore-pest beet armyworm. This fatty acid derivative, referred to as volicitin, triggers the synthesis and release of Volatile components, including terpenoids and indole in maize. Here we report on a previously unidentified enzyme, indole-3-glycerol phosphate lyase (IGL), that catalyzes the formation of free indole and is selectively activated by volicitin. IGL's enzymatic properties are similar to BX1, a maize enzyme that serves as the entry point to the secondary defense metabolites DIBOA and DIMBOA. Gene-sequence analysis indicates that Igl and Bx1 are evolutionarily related to the tryptophan synthase alpha subunit.
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页码:14801 / 14806
页数:6
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