CROSS-PROTECTION BETWEEN DIFFERENT PATHOTYPES OF Pepino mosaic virus REPRESENTING CHILEAN 2 GENOTYPE
Beata Hasiów-Jaroszewska
Institute of Plant Protection – National Research Institute in PoznańJulia Minicka
Institute of Plant Protection – National Research Institute in PoznańHenryk Pospieszny
Institute of Plant Protection – National Research Institute in PoznańAbstract
Viral cross-protection in plants is a phenomenon, where a mild virus isolate can protect plants against damage caused by a severe challenge isolate of the same virus. It
has been used on a large scale in cases where no resistant plants are available. We examined differences in cross-protection between pathotypes of Pepino mosaic virus representing
Chilean 2 genotype. The potential of a mild PepMV-P22 isolate to protect tomato against more aggressive challenge isolates causing yellowing and necrotic symptoms was
established. The challenge isolates were PepMV-P5-IY (yellowing), PepMV-P19 (necrotic) and PepMV-P22 K67E (artificial necrotic mutant of PepMV-P22 which differ from PepMV-P22 only by a point mutation). Efficient cross-protection was obtained using mild PepMV-P22 against PepMV-P5-IY. After a challenge inoculation with PepMV-P19 or PepMV-P22 K67E symptoms severity were significantly reduced in comparison to non-protected plants; however, necrotic symptoms appeared two months after coinfection. The real-time PCR analysis revealed that the level of accumulation of the necrotic isolate in tomato plants was even 5–7 times higher than that of PepMV-P22.
Keywords:
cross-protection, PepMV, viral variantsReferences
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Institute of Plant Protection – National Research Institute in Poznań
Institute of Plant Protection – National Research Institute in Poznań
Institute of Plant Protection – National Research Institute in Poznań
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