NDLI: Soybean (Glycine max) plants genetically modified to express resistance to glyphosate: can they modify airborne signals in tritrophic interactions?

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Soybean (Glycine max) plants genetically modified to express resistance to glyphosate: can they modify airborne signals in tritrophic interactions?

Content Provider	Springer Nature Link
Author	Strapasson, Priscila Pinto Zevallos, Delia M. Zarbin, Paulo H. G.
Copyright Year	2015
Abstract	Upon herbivory, plants activate complex biochemical pathways that result in an array of defense responses including the emission of a novel blend of volatile organic compounds (VOCs). These compounds mediate the recruitment of predators and parasitoids that exert biological control of the attacking herbivore. Genetic manipulation of a particular trait to improve agricultural plant varieties may affect other traits as a result of possible pleiotropy or insertional mutations, which in turn can affect the interaction of the plant with other organisms. Changes in herbivore-induced VOC emissions are known to occur in transgenic plants engineered to express resistance to insects (mainly Bt-plants), not only as a result of modified insect behavior but also as a result of altered resource allocation. Transgenic glyphosate-resistant plants express a variant of the enzyme EPSPS (5-enolpyruvylshikimate-3-phosphate synthase) that is insensitive to the herbicide glyphosate. This enzyme is essential in metabolic routes that result in the synthesis of amino acids and secondary metabolites. We addressed whether the constitutive and Anticarsia gemmatalis-induced emissions of VOCs from a transgenic soybean line differ from those of the isoline, and whether changes may interfere in the foraging behavior of the predatory bug Podisus nigrispinus. Analyses showed that both herbivory and genotype influenced VOC emissions. In addition, the genotype affected the herbivore-induced VOC emission. Larger emissions were measured in the transgenic line than the non-transgenic line upon herbivory. The bioassays showed that P. nigrispinus significantly discriminated only between the odors of undamaged and damaged plants of the non-transgenic line. No preference was observed for herbivore-damaged plants of any of the two lines over the other. The results from this study suggest that despite a greater emission of volatiles the predators are less able to discriminate between herbivore-damaged and undamaged transgenic plants. This condition does not necessarily increase the preference of the predator for damaged non-transgenic plants over transgenic plants. This study opens possibilities for new studies of chemical ecology in tritrophic systems to assess the effect of transgenic glyphosate-resistant plants.
Starting Page	7
Ending Page	14
Page Count	8
File Format	PDF
ISSN	09377409
Journal	CHEMOECOLOGY
Volume Number	26
Issue Number	1
e-ISSN	14230445
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-09-18
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Glyphosate Induced defenses Tritrophic interactions GMOs Shikimic acid pathway Ecology Entomology Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Biochemistry Ecology, Evolution, Behavior and Systematics

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Glyphosate-induced impairment of plant growth and micronutrient status in glyphosate-resistant soybean (Glycine max L.)

Ontogenetic and spatio-temporal patterns of induced volatiles in Glycine max in the light of the optimal defence hypothesis

Detection of adventitious presence of genetically modified seeds in lots of non transgenic soybean

Bioassay for detection of transgenic soybean seeds tolerant to glyphosate

Environmental risk assessment of genetically modified plants - concepts and controversies

Glyphosate applied at low doses can stimulate plant growth.

Glyphosate affects photosynthesis in first and second generation of glyphosate-resistant soybeans

Glyphosate reduces shoot concentrations of mineral nutrients in glyphosate-resistant soybeans

Evolved glyphosate-resistant weeds around the world: lessons to be learnt.

Soybean (Glycine max) plants genetically modified to express resistance to glyphosate: can they modify airborne signals in tritrophic interactions?

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