scholarly journals Insect egg deposition induces defence responses in Pinus sylvestris: characterisation of the elicitor

2005 ◽  
Vol 208 (10) ◽  
pp. 1849-1854 ◽  
Author(s):  
M. Hilker
Keyword(s):  
Pinus Sylvestris ◽  
Insect Egg ◽  
Egg Deposition ◽  
Defence Responses

Insectivorous Birds Are Attracted by Plant Traits Induced by Insect Egg Deposition

2018 ◽  
Vol 44 (12) ◽  
pp. 1127-1138 ◽  
Author(s):  
Elina Mäntylä ◽  
Sven Kleier ◽  
Carita Lindstedt ◽  
Silke Kipper ◽  
Monika Hilker
Keyword(s):  
Plant Traits ◽  
Insectivorous Birds ◽  
Insect Egg ◽  
Egg Deposition

The Plant's Response towards Insect Egg Deposition

2008 ◽  
pp. 205-233 ◽  
Author(s):  
Monika Hilker ◽  
Odette Rohfritsch ◽  
Torsten Meiners
Keyword(s):  
Insect Egg ◽  
Egg Deposition

Insect Egg Deposition Induces Indirect Defense and Epicuticular Wax Changes in Arabidopsis thaliana

2012 ◽  
Vol 38 (7) ◽  
pp. 882-892 ◽  
Author(s):  
Beatrice Blenn ◽  
Michele Bandoly ◽  
Astrid Küffner ◽  
Tobias Otte ◽  
Sven Geiselhardt ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Epicuticular Wax ◽  
Indirect Defense ◽  
Insect Egg ◽  
Egg Deposition

scholarly journals Can insect egg deposition ‘warn’ a plant of future feeding damage by herbivorous larvae?

2011 ◽  
Vol 279 (1726) ◽  
pp. 101-108 ◽  
Author(s):  
Ivo Beyaert ◽  
Diana Köpke ◽  
Josefin Stiller ◽  
Almuth Hammerbacher ◽  
Kinuyo Yoneya ◽  
...  
Keyword(s):  
Poor Performance ◽  
Feeding Damage ◽  
Insect Feeding ◽  
Insect Eggs ◽  
Phenolic Metabolites ◽  
Sawfly Larvae ◽  
Insect Egg ◽  
Egg Deposition ◽  
Larval Hatching ◽  
Herbivore Defence

Plant anti-herbivore defence is inducible by both insect feeding and egg deposition. However, little is known about the ability of insect eggs to induce defences directed not against the eggs themselves, but against larvae that subsequently hatch from the eggs. We studied how oviposition (OP) by the sawfly Diprion pini on Pinus sylvestris foliage affects the plant's defensive potential against sawfly larvae. Larvae that initiated their development on P. sylvestris twigs on which they hatched from eggs gained less weight and suffered higher mortality than those fed on egg-free twigs. The poor performance of these larvae also affected the next herbivore generation since fecundity of resulting females was lower than that of females which spent their larval development on egg-free pine. Transcript levels of P. sylvestris sesquiterpene synthases ( Ps TPS1, Ps TPS2) were increased by D. pini OP, reached their highest levels just before larval hatching, and decreased when larvae started to feed. However, concentrations of terpenoid and phenolic metabolites presumed to act as feeding deterrents or toxins for herbivores did not change significantly after OP and feeding. Nevertheless, our performance data suggest that insect egg deposition may act to ‘warn’ a plant of upcoming feeding damage by larvae.

Transcriptomic basis for reinforcement of elm antiherbivore defence mediated by insect egg deposition

2018 ◽  
Vol 27 (23) ◽  
pp. 4901-4915 ◽  
Author(s):  
Simone Altmann ◽  
Jose M. Muino ◽  
Vivien Lortzing ◽  
Ronny Brandt ◽  
Axel Himmelbach ◽  
...  
Keyword(s):  
Insect Egg ◽  
Egg Deposition ◽  
Antiherbivore Defence

Insect egg deposition renders plant defence against hatching larvae more effective in a salicylic acid-dependent manner

2018 ◽  
Vol 42 (3) ◽  
pp. 1019-1032 ◽  
Author(s):  
Vivien Lortzing ◽  
Jana Oberländer ◽  
Tobias Lortzing ◽  
Takayuki Tohge ◽  
Anke Steppuhn ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Plant Defence ◽  
Dependent Manner ◽  
Insect Egg ◽  
Egg Deposition

scholarly journals Responses to larval herbivory in the phenylpropanoid pathway of Ulmus minor are boosted by prior insect egg deposition

Planta ◽  
2021 ◽  
Vol 255 (1) ◽  
Author(s):  
Johanna Schott ◽  
Benjamin Fuchs ◽  
Christoph Böttcher ◽  
Monika Hilker
Keyword(s):  
Salicylic Acid ◽  
Phenylpropanoid Pathway ◽  
Leaf Beetle ◽  
Egg Laying ◽  
Plant Responses ◽  
Larval Feeding ◽  
Insect Eggs ◽  
Insect Egg ◽  
Ulmus Minor ◽  
Egg Deposition

Abstract Main conclusion Elms, which have received insect eggs as a ‘warning’ of larval herbivory, enhance their anti-herbivore defences by accumulating salicylic acid and amplifying phenylpropanoid-related transcriptional and metabolic responses to hatching larvae. Abstract Plant responses to insect eggs can result in intensified defences against hatching larvae. In annual plants, this egg-mediated effect is known to be associated with changes in leaf phenylpropanoid levels. However, little is known about how trees—long-living, perennial plants—improve their egg-mediated, anti-herbivore defences. The role of phytohormones and the phenylpropanoid pathway in egg-primed anti-herbivore defences of a tree species has until now been left unexplored. Using targeted and untargeted metabolome analyses we studied how the phenylpropanoid pathway of Ulmus minor responds to egg-laying by the elm leaf beetle and subsequent larval feeding. We found that when compared to untreated leaves, kaempferol and quercetin concentrations increased in feeding-damaged leaves with prior egg deposition, but not in feeding-damaged leaves without eggs. PCR analyses revealed that prior insect egg deposition intensified feeding-induced expression of phenylalanine ammonia lyase (PAL), encoding the gateway enzyme of the phenylpropanoid pathway. Salicylic acid (SA) concentrations were higher in egg-treated, feeding-damaged leaves than in egg-free, feeding-damaged leaves, but SA levels did not increase in response to egg deposition alone—in contrast to observations made of Arabidopsis thaliana. Our results indicate that prior egg deposition induces a SA-mediated response in elms to feeding damage. Furthermore, egg deposition boosts phenylpropanoid biosynthesis in subsequently feeding-damaged leaves by enhanced PAL expression, which results in the accumulation of phenylpropanoid derivatives. As such, the elm tree shows similar, yet distinct, responses to insect eggs and larval feeding as the annual model plant A. thaliana.

Insect egg deposition induces Pinus sylvestris to attract egg parasitoids

2002 ◽  
Vol 205 (4) ◽  
pp. 455-461 ◽  
Author(s):  
Monika Hilker ◽  
Carsten Kobs ◽  
Martti Varama ◽  
Kai Schrank
Keyword(s):  
Pinus Sylvestris ◽  
Systemic Reaction ◽  
Egg Parasitoid ◽  
Egg Parasitoids ◽  
Pine Needles ◽  
Herbivorous Insect ◽  
Pine Sawfly ◽  
Egg Deposition ◽  
Wound Signal ◽  
First Time

SUMMARY Plant volatiles released in response to feeding insects are known to attract enemies of the feeding herbivores. In this study, egg deposition by a herbivorous insect was shown to induce a gymnosperm plant to emit volatiles that attract egg parasitoids. Odour from twigs of Pinus sylvestris laden with egg masses of the pine sawfly Diprion pini attracts the eulophid egg parasitoid Chrysonotomyia ruforum. Volatiles released from pine twigs without diprionid eggs are not attractive. Oviposition by the sawfly onto pine needles induces not only a local response in pine needles laden with eggs but also a systemic reaction. Needles without eggs but adjacent to those bearing diprionid eggs also release the volatiles that attract the egg parasitoid. The elicitor of the attractive volatiles was shown to be present in the oviduct secretion coating the eggs of D. pini. When pine twigs are treated with jasmonic acid, a well-known plant wound signal, they emit volatiles that attract the egg parasitoid. These results show, for the first time, that a gymnosperm plant is able to attract parasitoids as soon as a herbivore has deposited its eggs on it. Thus, the plant appears to defend itself against herbivores prior to being damaged by feeding larvae.

Elm leaves ‘warned’ by insect egg deposition reduce survival of hatching larvae by a shift in their quantitative leaf metabolite pattern

2015 ◽  
Vol 39 (2) ◽  
pp. 366-376 ◽  
Author(s):  
Nadine Austel ◽  
Elisabeth J. Eilers ◽  
Torsten Meiners ◽  
Monika Hilker
Keyword(s):  
Insect Egg ◽  
Egg Deposition ◽  
Metabolite Pattern
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