Phloem connectivity and transport are not involved in mature plant resistance (MPR) to Potato Virus Y in different potato cultivars, and MPR is ineffective against recombinant strains of the virus

Publisher
Elsevier
Abstract
The aims of this study were: i) to investigate mature plant resistance (MPR) against four strains of Potato virus Y (PVYO , PVYN , PVYNTN and PVYN-Wi ) in potato cultivars that differ in maturity (e.g. early or maincrop) at different developmental stages, and ii) to determine whether phloem translocation of photoassimilates at different stages including the source-sink transition influences MPR. The data showed that MPR was induced at the flowering stage in all cultivars, and that the host-pathogen interaction is highly complex, with all three variables (potato cultivar, virus strain and developmental stage of infection) having a significant effect on the outcome. However, virus strain was the most important factor, and MPR was largely ineffective against the recombinant strains (PVYNTN and PVYN-Wi). Development of MPR was unrelated to foliar phloem connectivity, which was observed at all developmental stages, but a switch from symplastic to apoplastic phloem unloading early in tuber development may be involved in the prevention of tuber infections with PVYO.
Year
2022
Category
Refereed journal