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Inefficient weapon—the role of plant secondary metabolites in cotton defence against the boll weevil

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Abstract

Main conclusion

Cotton genotypes displayed similar volatile organic compound (VOC) profiles, but major differences in terpenoid aldehyde (TA) content. The differences in VOC production were minor among genotypes, but these differences are crucial for boll weevil attraction. Weevils did not display any preference in feeding behaviour towards cotton genotypes, suggesting physiological adaptation to cope with cotton chemical defence mechanisms.

Abstract

Plant cultivar selection for resistance to herbivore pests is an effective, environmentally safe and inexpensive method to implement in integrated pest management programmes. In this study, we evaluated seven cotton genotypes with respect to the production of volatile organic compounds (VOCs) and non-volatile compounds [terpenoid aldehydes (TAs)], and the attraction and feeding preference of adult boll weevils. Chemical analyses of VOCs from BRS-293, BRS-Rubi, CNPA TB-15, CNPA TB-85, CNPA TB-90, Delta Opal, and Empire Glandless showed that there were few qualitative and quantitative differences across the range of genotypes. In contrast, major differences in TA content were observed, with CNPA TB-15 and CNPA TB-85 producing higher levels of TAs compared to the other genotypes. Our results showed that boll weevil attraction to cotton genotypes varied, suggesting that the ratios and quantities of emitted cotton VOCs are important for host location. However, boll weevil feeding behaviour was neither positively nor negatively influenced by the terpenoid content (non-volatile compounds) of cotton genotypes. The results in this study suggest that boll weevils have adapted physiologically to cope with cotton chemical defence mechanisms.

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Abbreviations

DMNT:

(E)-4,8-Dimethyl-1,3,7-nonatriene

TA:

Terpenoid aldehyde

TMTT:

(E,E)-4,8,12-Trimethyltrideca-1,3,7,11-tetraene

VOC:

Volatile organic compound

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Acknowledgements

We thank Hélio Moreira dos Santos for helping with laboratory rearing of boll weevils and Dr. Fabio Aquino de Albuquerque for providing cotton seeds. We also thank the Post-Graduate Zoology Program of the University of Brasília (UnB) for the use of its facility. This work received financial support from the Coordination of Superior Level Staff Improvement (CAPES) through a grant to DMM (no. 99999.014964/2013-09), National Council of Technological and Scientific Development (CNPq), Federal District Research Foundation (FAP-DF) and the Brazilian Corporation of Agricultural Research (EMBRAPA). The work at Rothamsted forms part of the Smart Crop Protection (SCP) strategic programme (BBS/OS/CP/000001) funded through Biotechnology and Biological Sciences Research Council's Industrial Strategy Challenge Fund.

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Correspondence to Maria Carolina Blassioli-Moraes.

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Communicated by Dorothea Bartels.

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Magalhães, D.M., Borges, M., Laumann, R.A. et al. Inefficient weapon—the role of plant secondary metabolites in cotton defence against the boll weevil. Planta 252, 94 (2020). https://doi.org/10.1007/s00425-020-03497-w

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  • DOI: https://doi.org/10.1007/s00425-020-03497-w

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