Aphid antixenosis in cotton is activated by the natural plant defence elicitor cis- jasmone

A - Papers appearing in refereed journals

Hegde, M., Oliveira, J. N., Da Costa, J. G., Loza-Reyes, E., Bleicher, E., Santana, A. E. G., Caulfield, J. C., Mayon, P., Dewhirst, S. Y., Bruce, T. J. A., Pickett, J. A. and Birkett, M. A. 2012. Aphid antixenosis in cotton is activated by the natural plant defence elicitor cis- jasmone. Phytochemistry. 78 (June), pp. 81-88.

AuthorsHegde, M., Oliveira, J. N., Da Costa, J. G., Loza-Reyes, E., Bleicher, E., Santana, A. E. G., Caulfield, J. C., Mayon, P., Dewhirst, S. Y., Bruce, T. J. A., Pickett, J. A. and Birkett, M. A.
Abstract

Upon insect herbivory, plants can release blends of volatile organic compounds (VOCs) that modify herbivore and natural enemy behaviour. We have shown recently that cotton, Gossypium hirsutum, emits a blend of defence VOCs that repels the cotton aphid, Aphis gossypii, upon herbivory by this notorious crop pest, including (Z)-3-hexenyl acetate, (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT), methyl salicylate and (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene (TMTT). In this study, we investigated changes in the defence VOC profile of G. hirsutum induced by the naturally-occurring plant elicitor cis-jasmone (CJ) and whether these changes modify the behaviour of A. gossypii. In four-arm olfactometer assays, VOCs from untreated plants were significantly attractive (P < 0.05), whilst VOCs from CJ-treated plants were significantly repellent (P < 0.05). The VOCs induced by CJ appeared to comprise (Z)-3-hexenyl acetate, DMNT, methyl salicylate and TMTT. In quantitative VOC collection studies, sustained release of DMNT and TMTT was observed in CJ-treated plants over a period of five days, with levels becoming statistically significantly higher than for control treated plants on the fifth day in most cases. Despite earlier indications, no statistically significant differences were observed in levels of (Z)-3-hexenyl acetate or methyl salicylate between CJ and control treatments on any day. Furthermore, DMNT and TMTT emissions from CJ-treated plants were further enhanced by subsequent addition of A. gossypii. CJ treatment induced statistically significantly higher DMNT and TMTT expression levels as early as day three, when A. gossypii was present. The results in this study show that CJ can induce the production of A. gossypii-induced VOCs from G. hirsutum, with potential for deployment in novel crop protection strategies.

Year of Publication2012
JournalPhytochemistry
Journal citation78 (June), pp. 81-88
Digital Object Identifier (DOI)doi:10.1016/j.phytochem.2012.03.004
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDelivering Sustainable Systems (SS) [ISPG]
Innovative approaches to pest management
Publisher's version
Copyright license
Publisher copyright
Output statusPublished
Publication dates
Online17 Apr 2012
Publication process dates
Accepted05 Mar 2012
ISSN0031-9422
PublisherElsevier

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