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dc.contributor.authorPan, Yue
dc.contributor.authorZhao, Tao
dc.contributor.authorKrokene, Paal
dc.contributor.authorYu, Ze-fen
dc.contributor.authorQiao, Min
dc.contributor.authorLu, Jun
dc.contributor.authorChen, Peng
dc.contributor.authorYe, Hui
dc.identifier.citationFrontiers in Plant Science. 2018, 9 .nb_NO
dc.description.abstractYunnan pine is the most important tree species in SW China in both economical and ecological terms, but it is often killed by pine shoot beetles (Tomicus spp.). Tomicus beetles are secondary pests in temperate regions and the aggressiveness of the beetles in SW China is considered to be due to the warm subtropical climates as well as the beetles’ virulent fungal associates. Here, we assessed the virulence of three blue-stain fungi (Leptographium wushanense, L. sinense and Ophiostoma canum) associated with pine shoot beetles to Yunnan pine (Pinus yunnanensis) in SW China. Following fungal inoculation, we measured necrotic lesion lengths, antioxidant enzyme activities and monoterpene concentrations in the stem phloem of Yunnan pine. Leptographium wushanense induced twice as long lesions as L. sinense and O. canum, and all three fungi induced significantly longer lesions than sterile agar control inoculations. The activity of three tested antioxidant enzymes (peroxidase, polyphenol oxidase, and superoxide dismutase) increased after both fungal inoculation and control inoculation. However, L. wushanense and L. sinense generally caused a greater increase in enzyme activities than O. canum and the control treatment. Fungal inoculation induced stronger increases in six major monoterpenes than the control treatment, but the difference was significant only for some fungus-monoterpene combinations. Overall, our results show that L. wushanense and L. sinense elicit stronger defense responses and thus are more virulent to Yunnan pine than O. canum. The two Leptographium species may thus contribute to the aggressiveness of their beetle vectors and could damage Yunnan pine across SW China if they spread from the restricted geographical area they have been found in so far.nb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectLeptographium wushanense,nb_NO
dc.subjectL. sinensenb_NO
dc.subjectOphiostoma canumnb_NO
dc.subjectPhloem reaction zonenb_NO
dc.titleBark Beetle-Associated Blue-Stain Fungi Increase Antioxidant Enzyme Activities and Monoterpene Concentrations in Pinus yunnanensisnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.rights.holder© 2018 Pan, Zhao, Krokene, Yu, Qiao, Lu, Chen and Ye.nb_NO
dc.source.journalFrontiers in Plant Sciencenb_NO

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal