Mineral Oil Inhibits Movement of Potato Virus Y in Potato Plants in an Age-Dependent Manner.

Al-Daoud, F., Fageria, M.S., Zhang, J.H., Boquel, S., and Pelletier, Y. (2014). "Mineral Oil Inhibits Movement of Potato Virus Y in Potato Plants in an Age-Dependent Manner.", American Journal of Potato Research, 91(4), pp. 337-345. doi : 10.1007/s12230-013-9353-9  Access to full text

Abstract

Potato Virus Y (PVY) is one of the most devastating pathogens threatening potato production worldwide. It is a RNA virus that is disseminated by aphids in a non-persistent manner. Regular application of mineral oil on potato fields is known to reduce the number of PVY-positive tubers in post-harvest testing. The mechanism of this phenomenon is not well understood, but it is hypothesized to influence the virus-vector-plant relationships. Here, we present data from greenhouse and field trials that shed light on the effect of mineral oil on local and systemic accumulation of PVY{SUP}O{/SUP} in susceptible Shepody and Russet Burbank. The data suggests that mineral oil did not influence PVY{SUP}O{/SUP} levels in mechanically-inoculated leaves nor tubers of plants with a secondary infection. However, a reduction in systemic PVY{SUP}O{/SUP} levels was observed in mineral oil-treated older plants but not in younger plants, suggesting that mineral oil inhibits PVY{SUP}O{/SUP} movement in an age-dependent manner.

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