Search results for: Wilhelm Boland

Items from 1 to 20 out of 132 results

article

Involvement of CYP347W1 in neurotoxin 3‐nitropropionic acid‐based chemical defense in mustard leaf beetle Phaedon cochleariae

Nanxia Fu, Tobias Becker, Wolfgang Brandt, Maritta Kunert, more

Chrysomelina beetlesstore 3‐nitropropionic acid in form of a pretoxin, isoxazolin‐5‐one glucoside‐conjugated ester, to protect themselves against predators. Here we identified a cytochrome P450 monooxygenase, CYP347W1, to be involved in the production of the 3‐nitropropionic acid moiety of the isoxazolin‐5‐one glucoside ester. Knocking down CYP347W1 led to a significant depletion in the concentration...

article

A partially sex‐reversed giant kelp sheds light into the mechanisms of sexual differentiation in a UV sexual system

Dieter G. Müller, Enora Gaschet, Olivier Godfroy, Josselin Gueno, more

New Phytologist > 232 > 1 > 252 - 263

In UV sexual systems, sex is determined during the haploid phase of the life cycle and males have a V chromosome whereas females have a U chromosome. Previous work in the brown alga Ectocarpus revealed that the V chromosome has a dominant role in male sex determination and suggested that the female developmental programme may occur by ‘default’. Here, we describe the identification of a genetically...

article

Pyrrolic and Dipyrrolic Chlorophyll Degradation Products in Plants and Herbivores

Marcel Ritter, Vincensius S. P. Oetama, Daniel Schulze, Katrin Muetzlaff, more

Chemistry – A European Journal > 26 > 28 > 6205 - 6213

The degradation of chlorophyll, the omnipresent green pigment, has been investigated intensively over the last 30 years resulting in many elucidated tetrapyrrolic degradation products. With a comparison to the degradation of the structurally similar heme, we hereby propose a novel additional chlorophyll degradation mechanism to mono‐ and dipyrrolic products. This is the first proof of the occurrence...

article

Involvement of sweet pepper CaLOX2 in jasmonate‐dependent induced defence against Western flower thrips

Sandeep J Sarde, Klaas Bouwmeester, Jhon Venegas‐Molina, Anja David, more

Journal of Integrative Plant Biology > 61 > 10 > 1085 - 1098

Insect herbivory can seriously hinder plant performance and reduce crop yield. Thrips are minute cell‐content‐feeding insects that are important vectors of viral plant pathogens, and are serious crop pests. We investigated the role of a sweet pepper (Capsicum annuum) lipoxygenase gene, CaLOX2, in the defense of pepper plants against Western flower thrips (Frankliniella occidentalis). This was done...

article

The regulator of G‐protein signalling Thn1 links pheromone response to volatile production in Schizophyllum commune

Sophia Wirth, Maritta Kunert, Lisa‐Marija Ahrens, Katrin Krause, more

Environmental Microbiology > 20 > 10 > 3684 - 3699

The regulator of G‐protein signalling, Thn1, is involved in sexual development through pheromone signalling in the mushroom forming basidiomycete Schizophyllum commune affecting hyphal morphology and mating interactions. Thn1 plays a key role in coordinating sesquiterpene production, pheromone response and sexual development. The gene thn1 is transcriptionally regulated in response to mating with...

article

Caterpillars induce jasmonates in flowers and alter plant responses to a second attacker

Lucille T. S. Chrétien, Anja David, Eirini Daikou, Wilhelm Boland, more

New Phytologist > 217 > 3 > 1279 - 1291

In nature, herbivorous insects and plant pathogens are generally abundant when plants are flowering. Thus, plants face a diversity of attackers during their reproductive phase. Plant responses to one attacker can interfere with responses to a second attacker, and phytohormones that orchestrate plant reproduction are also involved in resistance to insect and pathogen attack. We quantified phytohormonal...

article

Mechanistic studies of sesquiterpene cyclases based on their carbon isotope ratios at natural abundance

Wenhua Tan, Stefan Bartram, Wilhelm Boland

Plant, Cell & Environment > 41 > 1 > 39 - 49

During the process of terpene biosynthesis, C–C bond breaking and forming steps are subjected to kinetic carbon isotope effects, leading to distinct carbon isotopic signatures of the products. Accordingly, carbon isotopic signatures could be used to reveal the ‘biosynthetic history’ of the produced terpenoids. Five known sesquiterpene cyclases, regulating three different pathways, representing simple...

article

Secondary ion mass spectrometry imaging and multivariate data analysis reveal co‐aggregation patterns of Populus trichocarpa leaf surface compounds on a micrometer scale

Purva Kulkarni, Mina Dost, Özgül Demir Bulut, Alexander Welle, more

The Plant Journal > 93 > 1 > 193 - 206

Spatially resolved analysis of a multitude of compound classes has become feasible with the rapid advancement in mass spectrometry imaging strategies. In this study, we present a protocol that combines high lateral resolution time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS) imaging with a multivariate data analysis (MVA) approach to probe the complex leaf surface chemistry of Populus trichocarpa...

article

Symbiont-Derived Antimicrobials Contribute to the Control of the Lepidopteran Gut Microbiota

Yongqi Shao, Bosheng Chen, Chao Sun, Keishi Ishida, more

Cell Chemical Biology > 2017 > 24 > 1 > 66-75

Insects develop efficient antimicrobial strategies to flourish in a bacterial world. It has long been proposed that native gut microbiota is an important component of host defense; however, the responsible species have rarely been isolated to elucidate the mechanism of action. Here we show that the dominant symbiotic bacterium Enterococcus mundtii associated with the generalist herbivore Spodoptera...

article

Gossypol toxicity and detoxification in Helicoverpa armigera and Heliothis virescens

Corinna Krempl, Hanna M. Heidel-Fischer, Guillermo Hugo Jiménez-Alemán, Michael Reichelt, more

Insect Biochemistry and Molecular Biology > 2016 > 78 > C > 69-77

Gossypol is a polyphenolic secondary metabolite produced by cotton plants, which is toxic to many organisms. Gossypol's aldehyde groups are especially reactive, forming Schiff bases with amino acids of proteins and cross-linking them, inhibiting enzyme activities and contributing to toxicity. Very little is known about gossypol's mode of action and its detoxification in cotton-feeding insects that...

article

Influence of zygomycete‐derived D'orenone on IAA signalling in Tricholoma‐spruce ectomycorrhiza

Katharina Wagner, Katrin Krause, Anja David, Marco Kai, more

Environmental Microbiology > 18 > 8 > 2470 - 2480

Despite the rising interest in microbial communication, only few studies relate to mycorrhization and the pool of potential morphogenic substances produced by the surrounding soil community. Here, we investigated the effect exerted by the C₁₈_‐ketone β‐apo‐13‐carotenone, D'orenone, on the ectomycorrhizal basidiomycete Tricholoma vaccinum and its symbiosis with the economically important host tree,...

article

The Aggregation Pheromone of Phyllotreta striolata (Coleoptera: Chrysomelidae) Revisited

Franziska Beran, Guillermo H. Jiménez-Alemán, Mei-ying Lin, Yun-Che Hsu, more

Journal of Chemical Ecology > 2016 > 42 > 8 > 748-755

Aggregations of the striped flea beetle Phyllotreta striolata on their crucifer host plants are mediated by volatiles emitted from feeding males. The male-specific sesquiterpene, (6R,7S)-himachala-9,11-diene (compound A), was shown previously to be physiologically and behaviorally active, but compound A was attractive only when combined with unnaturally high doses of the host plant volatile allyl...

article

Plant‐mediated pheromone emission by a hemipteran seed feeder increases the apparency of an unreliable but rewarding host

Mariana A. Stanton, Jens Preβler, Christian Paetz, Wilhelm Boland, more

New Phytologist > 211 > 1 > 113 - 125

The defensive chemistry and persistence of plant tissues determine their suitability and apparency – the likelihood of being discovered – to insect herbivores. As consumers of plant tissues with transient apparency, florivores and seed‐feeders must frequently migrate between host plants to synchronize colonization with plant phenology. Aggregation pheromones could provide information‐based solutions...

article

Two Defensive Lines in Juvenile Leaf Beetles; Esters of 3-nitropropionic Acid in the Hemolymph and Aposematic Warning

Gerhard Pauls, Tobias Becker, Peter Rahfeld, Rene R. Gretscher, more

Journal of Chemical Ecology > 2016 > 42 > 3 > 240-248

Juveniles of the leaf beetles in subtribe Chrysomelina have efficient defense strategies against predators. When disturbed, they transiently expose volatile deterrents in large droplets from nine pairs of defensive glands on their back. Here, we report on an additional line of defense consisting of the non-volatile isoxazolin-5-one glucoside and its 3-nitropropanoyl ester in the larval hemolymph....

article

Synthesis, metabolism and systemic transport of a fluorinated mimic of the endogenous jasmonate precursor OPC-8:0

Guillermo H. Jimenez-Aleman, Sandra S. Scholz, Monika Heyer, Michael Reichelt, more

BBA - Molecular and Cell Biology of Lipids > 2015 > 1851 > 12 > 1545-1553

Jasmonates (JAs) are fatty acid derivatives that mediate many developmental processes and stress responses in plants. Synthetic jasmonate derivatives (commonly isotopically labeled), which mimic the action of the endogenous compounds are often employed as internal standards or probes to study metabolic processes. However, stable-isotope labeling of jasmonates does not allow the study of spatial and...

article

Sequestration of plant-derived glycosides by leaf beetles: A model system for evolution and adaptation

Wilhelm Boland

Perspectives in Science > 2015 > 6 > C > 38-48

Leaf beetles have developed an impressive repertoire of toxins and repellents to defend themselves against predators. Upon attack, the larvae discharge small droplets from glandular reservoirs on their back. The reservoirs are “bioreactors” performing the late reactions of the toxin-production from plant-derived or de novo synthesised glucosides. The import of the glucosides into the bioreactor relies...

article

Systemic cytosolic Ca²⁺ elevation is activated upon wounding and herbivory in Arabidopsis

Victoria Kiep, Jyothilakshmi Vadassery, Justus Lattke, Jan‐Peter Maaß, more

New Phytologist > 207 > 4 > 996 - 1004

Calcium ion (Ca²⁺) signalling triggered by insect herbivory is an intricate network with multiple components, involving positive and negative regulators. Real‐time, noninvasive imaging of entire Arabidopsis thaliana rosettes was employed to monitor cytosolic free calcium ([Ca²⁺]_cyt) elevations in local and systemic leaves in response to wounding and Spodoptera littoralis feeding. Luminescence...

article

Spodoptera littoralis detoxifies neurotoxic 3-nitropropanoic acid by conjugation with amino acids

Alexey Novoselov, Tobias Becker, Gerhard Pauls, Stephan H. von Reuß, more

Insect Biochemistry and Molecular Biology > 2015 > 63 > Complete > 97-103

Spodoptera littoralis is a phytophagous generalist. Its host range includes more than 40 plant species, some of which produce 3-nitropropanoic acid (3-NPA), an irreversible inhibitor of mitochondrial succinate dehydrogenase. Growth in larvae fed an artificial diet with a sublethal admixture of 3-NPA (4.2 μmol per g) was slowed significantly, but larvae experienced no increase in mortality. In contrast,...

article

Glandular β-glucosidases in juvenile Chrysomelina leaf beetles support the evolution of a host-plant-dependent chemical defense

Peter Rahfeld, Wiebke Haeger, Roy Kirsch, Gerhard Pauls, more

Insect Biochemistry and Molecular Biology > 2015 > 58 > Complete > 28-38

Plant-feeding insects are spread across the entire plant kingdom. Because they chew externally on leaves, leaf beetle of the subtribe Chrysomelina sensu stricto are constantly exposed to life-threatening predators and parasitoids. To counter these pressures, the juveniles repel their enemies by displaying glandular secretions that contain defensive compounds. These repellents can be produced either...

article

The Green Gut: Chlorophyll Degradation in the Gut of Spodoptera littoralis

Amarsanaa Badgaa, Rita Büchler, Natalie Wielsch, Marie Walde, more

Journal of Chemical Ecology > 2015 > 41 > 11 > 965-974

Chlorophylls, the most prominent natural pigments, are part of the daily diet of herbivorous insects. The spectrum of ingested and digested chlorophyll metabolites compares well to the pattern of early chlorophyll-degradation products in senescent plants. Intact chlorophyll is rapidly degraded by proteins in the front- and midgut. Unlike plants, insects convert both chlorophyll a and b into the corresponding...

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JASMONIC ACID (9)
CHEMICAL DEFENSE (6)
HERBIVORY (6)
PHASEOLUS LUNATUS (6)
SEQUESTRATION (5)
BIOSYNTHESIS (4)
CHRYSOMELIDAE (4)
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ARABIDOPSIS THALIANA (3)
CALCIUM (3)
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CORONATINE (3)
FAT BODY (3)
INDIRECT DEFENCE (3)
ISOPRENOID BIOSYNTHESIS (3)
JASMONATES (3)
OXYLIPINS (3)
SALICYLALDEHYDE (3)
SALICYLIC ACID (3)
TRISPORIC ACID (3)
VOLATILE ORGANIC COMPOUNDS (3)
VOLATILES (3)
ACYRTHOSIPHON PISUM (2)
MEDICAGO TRUNCATULA (2)
SPODOPTERA LITTORALIS (2)
3-HYDROXY-3-METHYLGLUTARYL-COA REDUCTASE (2)
8-HYDROXYGERANIOL (2)
ALLYL ISOTHIOCYANATE (2)
APHID ALARM PHEROMONE (2)
BIOTIC STRESS (2)
CANTHARIDIN (2)
CROSS-TALK (2)
DESOXY-D-XYLULOSE (2)
DEVELOPMENT (2)
ELICITORS (2)
ETHYLENE (2)
EXTRAFLORAL NECTAR (2)
INDANOYL ISOLEUCINE CONJUGATES (2)
INDIRECT DEFENSE (2)
INDUCED DEFENSE (2)
INDUCED RESISTANCE (2)
IRMS (2)
JASMONATE (2)
LEPIDOPTERANS (2)
LIMA BEAN (PHASEOLUS LUNATUS) (2)
MATING (2)
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MELOIDAE (2)
MEVALONATE (2)
MOLECULAR MODELING (2)
NATURAL PRODUCTS (2)
NITRIC OXIDE (2)
ORAL SECRETION (2)
OXIDASE (2)
OXYLIPIN (2)
PARASITOIDS (2)
PEA APHID (2)
PHENOLICS (2)
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PLANAR LIPID BILAYER (2)
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PYROPHEOPHORBIDE (2)
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SESQUITERPENE (2)
SPODOPTERA (2)
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(3R)-[4- 2 H 3 , 15- 2 H 3 ]NEROLIDOL (1)
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Search results for: Wilhelm Boland

Involvement of CYP347W1 in neurotoxin 3‐nitropropionic acid‐based chemical defense in mustard leaf beetle Phaedon cochleariae

A partially sex‐reversed giant kelp sheds light into the mechanisms of sexual differentiation in a UV sexual system

Pyrrolic and Dipyrrolic Chlorophyll Degradation Products in Plants and Herbivores

Involvement of sweet pepper CaLOX2 in jasmonate‐dependent induced defence against Western flower thrips

The regulator of G‐protein signalling Thn1 links pheromone response to volatile production in Schizophyllum commune

Caterpillars induce jasmonates in flowers and alter plant responses to a second attacker

Mechanistic studies of sesquiterpene cyclases based on their carbon isotope ratios at natural abundance

Secondary ion mass spectrometry imaging and multivariate data analysis reveal co‐aggregation patterns of Populus trichocarpa leaf surface compounds on a micrometer scale

Symbiont-Derived Antimicrobials Contribute to the Control of the Lepidopteran Gut Microbiota

Gossypol toxicity and detoxification in Helicoverpa armigera and Heliothis virescens

Influence of zygomycete‐derived D'orenone on IAA signalling in Tricholoma‐spruce ectomycorrhiza

The Aggregation Pheromone of Phyllotreta striolata (Coleoptera: Chrysomelidae) Revisited

Plant‐mediated pheromone emission by a hemipteran seed feeder increases the apparency of an unreliable but rewarding host

Two Defensive Lines in Juvenile Leaf Beetles; Esters of 3-nitropropionic Acid in the Hemolymph and Aposematic Warning

Synthesis, metabolism and systemic transport of a fluorinated mimic of the endogenous jasmonate precursor OPC-8:0

Sequestration of plant-derived glycosides by leaf beetles: A model system for evolution and adaptation

Systemic cytosolic Ca²⁺ elevation is activated upon wounding and herbivory in Arabidopsis

Spodoptera littoralis detoxifies neurotoxic 3-nitropropanoic acid by conjugation with amino acids

Glandular β-glucosidases in juvenile Chrysomelina leaf beetles support the evolution of a host-plant-dependent chemical defense

The Green Gut: Chlorophyll Degradation in the Gut of Spodoptera littoralis

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