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IDENTIFICATION OF
RESISTANCE SOURCE IN POTATO GERMPLASM AGAINST
PVX AND PVY
NADEEM AHMAD1, M. ASLAM KHAN1, NASIR AHMAD KHAN1,
R. BINYAMIN1* AND M. AZAM KHAN2
Abstract:
Potato is
attacked by various diseases (bacterial, viral and fungal). PVX and PVY
diseases of potato caused by PVX (Potex virus X) and PVY (Poty
virus Y) causes heavy losses to the potato crop. In Pakistan, potato
crop losses were reported up to 83% due to viruses. Potato germplasm
consisting of 28 genotypes was screened against the PVX and PVY under
field conditions during two seasons 2008-10. In case of PVX eight
genotypes i.e., 494055-40, FD9619, OCEANIA, FD48-4, TPS-9801, FSD RED,
394021-125, FD3713, showed variable response in both years probably due
to their genetic instability and in case of PVY six genotypes i.e.,
FD1-8, FD9619, CARDINAL, DESIREE, TPS-9802, 393574-61 also showed
different response might be due to variation of vector population or due
to genetic instability. Out of 28 varieties/lines there were 3 varieties
FD3-10, FD3-9 and 393574-61 found to be highly resistant against PVX.
Only 3 varieties MIRRATO, ARTERIX and DESIREE were moderately
susceptible while 8 were moderately resistant and 6 were found to be
resistant against PVX. While in case of PVY out of 28 varieties/lines
five varieties TPS-9801, FD32-2, OCEANIA, FD13 and FD3713 were found to
be resistant against PVY and four varieties FSD RED, ARTERIX, ORLA and
FD3-10 were susceptible. Four varieties were found moderately resistant,
nine varieties were found moderately susceptible against PVY. In
addition to field screening resistant source of potato was identified
through biological and serological test (ELISA test) against PVX and
PVY. Screening of different varieties of potato against PVX and PVY
diseases to find resistant source to control the disease is an
economical way and the results would help in the recognition of
available resistant germplasm against the disease, and will be utilized
for potato improvement program in Pakistan.
1Department of Plant Pathology, University of Agriculture, Faisalabad,
Pakistan.
2Department of Horticulture, University of PMAS Arid Agriculture,
Rawalpindi, Pakistan
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