NDLI: Effect of Potato Virus S Infection on Late Blight Resistance in Potato

Content Provider	Springer Nature Link
Author	Lin, Yu Hsuan Johnson, Dennis A. Pappu, Hanu R.
Copyright Year	2014
Abstract	Late blight, caused by Phytophthora infestans , is a destructive disease of potato. Defender is the only cultivar in the U.S. with foliar and tuber resistance to this disease. However, this cultivar exhibits susceptibility to infection by Potato virus S (PVS) and severe symptoms appeared on leaves after infection with PVS. PVS is widespread in potato fields in the U.S. To investigate potential interactions between P. infestans and PVS, detached leaves of Defender and Ranger Russet (susceptible to late blight), that were either PVS-infected or non-infected, were inoculated with P. infestans BF-05. The amount of sporulation and the extent of lesion expansion on inoculated leaves were measured to estimate late blight severity. When inoculated with P. infestans only, as expected, Defender exhibited discrete, relatively small, dark purple to black hypersensitive reaction-like spots and on an average had twenty times fewer sporangia compared to Ranger Russet. However, in Defender plants infected with PVS, lesion expansion and sporulation increased significantly compared to PVS-free Defender. The increased severity of late blight in PVS-infected Defender suggests that PVS negatively impacts late blight resistance in this cultivar. This study demonstrates that late blight resistance in cultivars to be released should be screened for PVS susceptibility.El tizón tardío, causado por Phytophthora infestans, es una enfermedad destructiva de la papa. Defender es la única variedad en los EUA con resistencia foliar y de tubérculo a esta enfermedad. No obstante, presenta susceptibilidad a la infección por el virus S de la papa (PVS), y se presentan síntomas severos en hojas después de la infección con PVS. Este virus esta ampliamente distribuido en los campos de papa en los EUA. Para investigar las interacciones potenciales entre P. infestans y PVS, se inocularon hojas desprendidas de Defender y Ranger Russet (susceptible al tizón tardío), con P. infestans BF-05, que estuvieron o no infectadas con PVS. Se midió la cantidad de esporulación y la amplitud en la expansión de la lesión en las hojas inoculadas, para estimar la severidad del tizón tardío. Cuando se inocularon con P. infestans únicamente, como se esperaba, Defender exhibió lesiones discretas, relativamente pequeñas, de morado oscuro a negro, y en promedio tuvieron veinte veces menos esporangios comparadas con Ranger Russet. No obstante, en plantas de Defender infectadas con PVS, la expansión de la lesión y la esporulación aumentaron significativamente comparadas con Defender libre de PVS. La severidad aumentada de tizón tardío en Defender infectada con PVS sugiere que PVS impacta negativamente la resistencia al tizón en esta variedad. Este estudio demuestra que la resistencia al tizón tardío en variedades a liberar deberían probarse para su susceptibilidad al PVS.
Starting Page	642
Ending Page	648
Page Count	7
File Format	PDF
ISSN	1099209X
Journal	American Potato Journal
Volume Number	91
Issue Number	6
e-ISSN	18749380
Language	English
Publisher	Springer US
Publisher Date	2014-06-07
Publisher Institution	Potato Association of America
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Potato virus S Phytophthora infestans Late blight resistance Plant Sciences Agriculture Plant Genetics & Genomics Plant Breeding/Biotechnology Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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