Constitutive and Inducible Resistance to Thrips Do Not Correlate With Differences in Trichome Density or Enzymatic-Related Defenses in Chrysanthemum

Chen, Gang; Klinkhamer, Peter G. L.; Escobar-Bravo, Rocío (2020). Constitutive and Inducible Resistance to Thrips Do Not Correlate With Differences in Trichome Density or Enzymatic-Related Defenses in Chrysanthemum. Journal of Chemical Ecology, 46(11-12), pp. 1105-1116. Springer 10.1007/s10886-020-01222-1

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Western flower thrips (WFT), Frankliniella occidentalis, is a serious insect pest of Chrysanthemum [Chrysanthemum × morifolium Ramat. (Asteraceae)]. Here we have investigated whether genotypic variation in constitutive and inducible resistance to WFT correlates with phenotypic differences in leaf trichome density and the activity of the defense-related enzyme polyphenol oxidase (PPO) in chrysanthemum. Non-glandular and glandular leaf trichome densities significantly varied among ninety-five chrysanthemum cultivars. Additional analyses in a subset of these cultivars, differing in leaf trichome density, revealed significant variation in PPO activities and resistance to WFT as well. Constitutive levels of trichome densities and PPO activity, however, did not correlate with chrysanthemum resistance to WFT. Further tests showed that exogenous application of the phytohormone jasmonic acid (JA) increased non-glandular trichome densities, PPO activity and chrysanthemum resistance to WFT, and that these effects were cultivar dependent. In addition, no tradeoff between constitutive and inducible resistance to WFT was observed. JA-mediated induction of WFT resistance, however, did not correlate with changes in leaf trichome densities nor PPO activity levels. Taken together, our results suggest that chrysanthemum can display both high levels of constitutive and inducible resistance to WFT, and that leaf trichome density and PPO activity may not play a relevant role in chrysanthemum defenses against WFT.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Biotic Interactions

UniBE Contributor:

Escobar Bravo, Rocio

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0098-0331

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

16 Nov 2020 10:14

Last Modified:

25 Nov 2020 08:28

Publisher DOI:

10.1007/s10886-020-01222-1

PubMed ID:

33089352

Uncontrolled Keywords:

Chrysanthemum × morifolium; Frankliniella occidentalis; Jasmonic acid; Plant resistance; Polyphenol oxidase; Trichome density.

BORIS DOI:

10.7892/boris.147397

URI:

https://boris.unibe.ch/id/eprint/147397

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