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Influence of herbivore-induced changes in host plants on reproductive behaviours in Spodoptera littoralis

herbivore-plant interactions

Ali, Muhammad Zakir (2012). Influence of herbivore-induced changes in host plants on reproductive behaviours in Spodoptera littoralis. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2012:77
ISBN 978-91-576-7724-2
[Doctoral thesis]

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Abstract

Insect herbivores orient towards host plants using sensory cues and olfaction plays a major role, especially in nocturnal herbivores, during selection of host plants suitable for feeding, mating and oviposition. Plants defend themselves from herbivore feeding by producing volatiles as well as non-volatiles chemical compounds. Volatile compounds produced in response to feeding damage by herbivores are commonly referred to as herbivore-induced plant volatiles (HIPVs). Emissions of HIPVs are ecologically important as they can increase plant resistance by repelling herbivores and by attracting the natural enemies of the herbivores. We observed a significant reduction in mating when male and female Spodoptera littoralis moths were allowed to mate in the presence of damaged cotton (Gossypium hirsutum) plants. Male activation and attraction towards female sex pheromone was reduced in the presence herbivore-damaged cotton plants. Similarly, females kept individually with damaged cotton plants spent less time in calling compared to females on undamaged plants. These results provide first evidence that herbivore-induced changes in host plants can affect calling and mating behaviours of an insect herbivore.
In behavioural studies, in the laboratory as well as in the field, we showed that HIPV emissions from damaged cotton plant neighbours provide resistance to undamaged plants within both conspecific and heterospecific plant patches. Furthermore we found that associational resistance through HIPVs is unidirectional and is highly specific among the tested plant species. Undamaged cotton and alfalfa (Medicago sativa) plants in patches with damaged cotton plant neighbours received fewer eggs, whereas we found no associational resistance when damaged alfalfa and clover (Trifolium alexandrinum) neighbours were present. Electrophysiological (GC-EAD) studies showed that the antennae of the mated female S. littoralis moths detected 18 compounds among the headspace collections of HIPVs from damaged cotton plants. Behavioural studies showed that a blend of seven de novo synthesized volatile compounds among GC-EAD active compounds were sufficient to repel ovipositing S. littoralis. Our results suggest that de novo synthesized volatile compounds provide signalling cues to ovipositing female moths that the plants are under herbivore attack and can be used as reliable cues to avoid plants of low food quality and to reduce risk for competition and predation. Our studies show that HIPVs can have large effect on both male and female reproductive behaviours and that it can affect ecological interactions.

Authors/Creators:Ali, Muhammad Zakir
Title:Influence of herbivore-induced changes in host plants on reproductive behaviours in Spodoptera littoralis
Subtitle:herbivore-plant interactions
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :17 October 2012
Volume:2012:77
Number of Pages:47
Papers/manuscripts:
NumberReferences
IAli Zakir, Medhat M Sadek, Marie Bengtsson, Bill S Hansson, Peter Witzgall, Peter Anderson. Herbivore-induced plant volatiles provide associational resistance against an ovipositing herbivore (submitted).
IIAli Zakir, Marie Bengtsson, Medhat M Sadek, Bill S Hansson, Peter Witzgall, Peter Anderson. Herbivore-induced de novo synthesized volatile compounds in cotton repel oviposition in the moth Spodoptera littoralis (submitted).
IIIAli Zakir, Mohamed Khallaf, Bill S Hansson, Peter Witzgall, Peter Anderson. Herbivore-induced changes in host plant modulate reproductive behaviours in male Spodopetra littoralis moths (manuscript).
IVAli Zakir, Bill S Hansson, Peter Witzgall, Peter Anderson. Modulation of female calling behaviour in Spodoptera littoralis by herbivore damage induced changes in a host plant (manuscript).
Place of Publication:Alnarp
Publisher:Dept. of Plant Protection Biology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7724-2
ISSN:1652-6880
Language:English
Additional Information:External funder "Higher Education Commission (HEC), Pakistan"
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H01 Protection of plants - General aspects
H Protection of plants and stored products > H10 Pests of plants
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:spodoptera littoralis, herbivores, olfaction, gossypium hirsutum, sexual behaviour, oviposition, plant animal relations, gas chromatography, defence mechanisms
Keywords:Herbivory, Spodoptera littoralis, olfaction, Gossypium hirsutum, oviposition, HIPVs, associational resistance, herbivore-plant interactions, repellents, gas-chromatography electroentennographic detection (GC-EAD), plant defence, signal reliability
URN:NBN:urn:nbn:se:slu:epsilon-e-659
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-659
ID Code:9141
Department:(LTJ, LTV) > Department of Plant Protection Biology
External funders:FORMAS
Deposited By: Mr. Zakir Ali
Deposited On:22 Oct 2012 14:53
Metadata Last Modified:19 Feb 2015 14:22

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