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Pathogenicity of Potato virus Y strains in different potato varieties

Bai Y, Han S,Gao Y, Zhang W, Fan G, Qiu C, Shen Y, Zhang S, Shang H, Nie X, Wen J. 2017. Pathogenicity of Potato virus Y strains in different potato varieties. Acta Agriculturae Boreali-occidentalis Sinica 27: 1713-1720

Abstract

Potato virus Y (PVY) is one of the most common and destructive viruses that affects potato production worldwide. To unveil the effects and the pathogenicity of different strains of PVY in different potato varieties, four natural recombinant PVY strains including PVYN:O, PVYN-Wi, PVYNTN-NW(SYR-I) and PVYNTN-NW(SYR-II) were mechanically inoculated onto four potato varieties. In addition to the visual foliar and tuber symptom observations, the ultrastructure and cellular morphology changes were also monitored by electron microscopy. Generally, PVYN-Wi caused mild symptoms (mainly mosaic) on all varieties, whereas the remaining strains caused severe foliar and/or tuber symptoms. The variety Xingjia 2 exhibited mild foliar symptoms in comparison to other varieties especially Kexin 13 and Kexin 18 upon infection with different strains of PVY, suggesting a disease tolerance in the foliage of Xingjia 2. Interestingly, in spite of the fact that PVYN-Wi only caused mild symptoms in all varieties, it induced varying degrees of cellular morphological changes ranging from pinwheel formation in Xingjia 2 to pinwheel formation, chloroplast degradation, membrane proliferation and cell deformation in Kexin 18. The pathogenicity of PVYNTN-NW (SYR-I and SYR-II) is the strongest among the tested strains, which not only caused serve foliar symptoms in Kexin 13, Kexin 18 and Favorita, but also incited necrotic ringspots in tubers in at least two varieties (i.e., Kexin 13 and Xingjia 2).. The pathogenicity of PVYN:O falls between PVYN-Wi and PVYNTN-NW, and it caused intermediate level of symptoms in plants and intermediate degree of changes in ultrastructure. This study sheds light on the interactions between different PVY strains and different potato varieties at both whole-plant and ultrastructural levels, thus providing insights for better management of this destructive virus in potato crops.

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