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Volatiles from Plants Induced by Multiple Aphid Attacks Promote Conidial
Performance of Lecanicillium lecanii
#MMPMID26999795
Lin Y
; Hussain M
; Avery PB
; Qasim M
; Fang D
; Wang L
PLoS One
2016[]; 11
(3
): e0151844
PMID26999795
show ga
Herbivore-induced plant volatiles (HIPVs) are clues that help predatory insects
search for food. The hypothesis that entomopathogenic fungi, which protect
plants, benefit from the release of HIPVs was tested. The plant Arabidopsis
thaliana was used as the source of HIPVs. The insect herbivore Lipaphis erysimi
(Kaltenbach) was used as the inducer, and the fungal pathogen of the aphid
Lecanicillium lecanii was exposed to HIPVs to test our hypothesis. When exposed
to aphid-induced A. thaliana volatiles, the mortality of aphids pre-treated with
a conidial suspension of L. lecanii, the conidial germination and the
appressorial formation were significantly increased compared with the control.
The decan-3-ol and 4-methylpentyl isothiocyanate that were detected in the
headspace seemed to have positive and negative affection, respectively. Moreover,
HIPVs generated from groups of eight aphids per plant promoted significantly
increased conidial germination and appressorial formation compared with HIPVs
from groups of one, two and four aphids per plant. Our results demonstrated that
the pathogenicity of the entomopathogenic fungus L. lecanii was enhanced when
exposed to HIPVs and that the HIPVs were affected by the number of insect
herbivores that induced them.
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