Abstract :
[en] Barley yellow dwarf virus (BYDV), transmitted by the wheat aphid, generates serious
wheat yellow dwarf disease and causes great losses in agriculture. Induced resistance has attracted
great attention over recent years as a biological method to control plant pathogens and herbivores.
Protein elicitor PeaT1 induces defense response in plants against fungi, viruses, and aphids. In this
study, wheat seeds and seedlings were soaked and sprayed with 30 g/mL PeaT1, respectively.
Then seedlings were inoculated with BYDV by viruliferous Schizaphis graminum to detect the control
e ciency of PeaT1-induced resistance against BYDV. The control e ciency was over 30% on the 14th
and 21st days after the inoculation access period. Quantitative real time polymerase chain reaction
(Q-RT-PCR) tests showed that there was less mRNA from the BYDV coat protein in PeaT1-treated
wheat seedlings than in the control group. Electrical penetration graph (EPG) tests showed that virus
transmission vector S.graminum took a longer time to find probe and feeding sites on PeaT1-treated
wheat seedlings. Additionally, PeaT1-treated wheat seedlings gained higher plant height and more
chlorophyll a&b. These results showed that PeaT1 e ciently controlled BYDV by inhibiting BYDV
proliferation, reducing the virus transmission ability of S. graminum and alleviating the symptoms
of dwarfism and yellow colouring caused by BYDV. This study provided a new integrated way to
control BYDV biologically.
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