Journal ArticleDOI
Differential Effects of Indole and Aliphatic Glucosinolates on Lepidopteran Herbivores
René Müller,Martin De Vos,Joel Y. Sun,Ida E. Sønderby,Barbara Ann Halkier,Ute Wittstock,Georg Jander +6 more
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TLDR
Choice tests show that aliphatic and indole glucosinolates act in an additive manner to promote larval feeding of both species and P. rapae oviposition, and support the hypothesis that a diversity of glucos inolates is required to limit the growth of multiple insect herbivores.Abstract:
Glucosinolates are a diverse group of defensive secondary metabolites that is characteristic of the Brassicales. Arabidopsis thaliana (L.) Heynh. (Brassicaceae) lines with mutations that greatly reduce abundance of indole glucosinolates (cyp79B2 cyp79B3), aliphatic glucosinolates (myb28 myb29), or both (cyp79B2 cyp79B3 myb28 myb29) make it possible to test the in vivo defensive function of these two major glucosinolate classes. In experiments with Lepidoptera that are not crucifer-feeding specialists, aliphatic and indole glucosinolates had an additive effect on Spodoptera exigua (Hubner) (Lepidoptera: Noctuidae) larval growth, whereas Trichoplusia ni (Hubner) (Lepidoptera: Noctuidae) and Manduca sexta (L.) (Lepidoptera: Sphingidae) were affected only by the absence of aliphatic glucosinolates. In the case of two crucifer-feeding specialists, Pieris rapae (L.) (Lepidoptera: Pieridae) and Plutella xylostella (L.) (Lepidoptera: Plutellidae), there were no major changes in larval performance due to decreased aliphatic and/or indole glucosinolate content. Nevertheless, choice tests show that aliphatic and indole glucosinolates act in an additive manner to promote larval feeding of both species and P. rapae oviposition. Together, these results support the hypothesis that a diversity of glucosinolates is required to limit the growth of multiple insect herbivores.read more
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Diamondback Moth Ecology and Management: Problems, Progress, and Prospects
TL;DR: Improved ecological understanding and the availability of a series of highly effective selective insecticides throughout the 1990s provided the basis for sustainable and economically viable integrated pest management (IPM) approaches, however, repeated reversion to scheduled insecticide applications has resulted in resistance to these and more recently introduced compounds and the breakdown of IPM programs.
Journal ArticleDOI
Arabidopsis basic helix-loop-helix transcription factors MYC2, MYC3, and MYC4 regulate glucosinolate biosynthesis, insect performance, and feeding behavior.
Fabian Schweizer,Patricia Fernández-Calvo,Mark Zander,Monica Diez-Diaz,Sandra Fonseca,Gaétan Glauser,Mathew G. Lewsey,Joseph R. Ecker,Roberto Solano,Philippe Reymond +9 more
TL;DR: A triple mutant of MYC2, MYC3, and MYC4 transcription factors is devoid of glucosinolates and more sensitive to attack by a generalist insect, underlines the importance of GS in shaping plant interactions with adapted and nonadapted herbivores.
Journal ArticleDOI
Herbivory in the Previous Generation Primes Plants for Enhanced Insect Resistance
Sergio Rasmann,Martin De Vos,Clare L. Casteel,Donglan Tian,Rayko Halitschke,Joel Y. Sun,Anurag Agrawal,Gary W. Felton,Georg Jander +8 more
TL;DR: Epigenetic resistance to herbivory thus represents a phenotypically plastic mechanism for enhanced defense across generations and is suggested to be more widely distributed in plants.
Journal ArticleDOI
MYB34, MYB51, and MYB122 Distinctly Regulate Indolic Glucosinolate Biosynthesis in Arabidopsis thaliana
TL;DR: Analysis of glucosinolate levels in seedlings of myb34, myB51, myb122,Myb34 myb51 double, and myb32 myb52 triple knockout mutants grown in the presence of abscisic acid, salicylic acid, jasmonate, or ethylene revealed that these three MYB factors are indispensable for IG production under standard growth conditions.
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Insect herbivore counteradaptations to the plant glucosinolate–myrosinase system
Inis B. Winde,Ute Wittstock +1 more
TL;DR: One of these counteradaptations, the nitrile-specifier protein identified in Pierid species, has been used to demonstrate mechanisms of coevolution of plants and their insect herbivores.
References
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Journal ArticleDOI
The chemical diversity and distribution of glucosinolates and isothiocyanates among plants
TL;DR: This review addresses the complex array of glucosinolates, the precursors of isothiocyanates, present in sixteen families of dicotyledonous angiosperms including a large number of edible species including Brassica vegetables.
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Biology and biochemistry of glucosinolates
TL;DR: Glucosinolates are sulfur-rich, anionic natural products that upon hydrolysis by endogenous thioglucosidases called myrosinases produce several different products that function as cancer-preventing agents, biopesticides, and flavor compounds.
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Genetic control of natural variation in Arabidopsis glucosinolate accumulation.
Daniel J. Kliebenstein,Juergen Kroymann,Paul D Brown,Antje Figuth,Deana Pedersen,Jonathan Gershenzon,Thomas Mitchell-Olds +6 more
TL;DR: There appears to be a modular genetic system regulating glucos inolate profiles in Arabidopsis that allows the rapid generation of new glucosinolate combinations in response to changing herbivory or other selective pressures.
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Trp-dependent auxin biosynthesis in Arabidopsis: involvement of cytochrome P450s CYP79B2 and CYP79B3.
Yunde Zhao,Anna K. Hull,Neeru R. Gupta,Kendrick A. Goss,Jose M. Alonso,Joseph R. Ecker,Jennifer Normanly,Joanne Chory,John L. Celenza +8 more
TL;DR: Evidence is provided that the two Arabidopsis cytochrome P450s, CYP79B2 and CYP 79B3, are critical enzymes in auxin biosynthesis in vivo, and IAOx is thus implicated as an important intermediate in auxIn biosynthesis.
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Glucosinolate research in the Arabidopsis era.
TL;DR: There is a strong interest in the ability to regulate and optimize the levels of individual glucosinolates tissue-specifically to improve the nutritional value and pest resistance of crops.