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Effects of the superinfection with tobacco mosaic virus (TMV) on susceptible tobacco plants infected with potato virus Y (PVY)
were determined. Dynamic changes in the TMV and/or PVY contents, the ribonucleases (RNases), the phosphomonoesterase (PME),
the phosphodiesterase (PDE) and the glucose-6-phosphate dehydrogenase (G6P DH) activities were studied. The PVY infection
caused a substantial reduction in the multiplication of TMV. The content of TMV in the PVY inoculated leaves amounts to 6
and 9 % in the PVY systemically infected leaves when compared with single TMV. Surprisingly, the challenging virus (TMV) enhanced
the content of inducing virus (PVY) in the locally inoculated leaves up to 130 – 141 %. In contrast, the reduction of PVY
content down to 35 – 40 % by TMV was seen in the PVY systemically infected leaves. The activities of the RNase, the PME, the
PDE and the G6P DH were increased (when compared with the healthy plants) during the acute phase of single virus multiplication
(PVY or TMV). The increase in the activities of the enzymes in the leaves with mixed infection was at least as high as the
sum of the increases of single infections. Moreover, a higher increase than the sum was seen for G6P DH and PDE (by about
20 – 35 %).
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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