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Title

SCREENING OF SOME POTATO GENOTYPES AND CULTIVARS FOR RESISTANCE TO POTATO LEAFROLL VIRUS

Writers

NIKAN J.

Pages

 Start Page | End Page

Abstract

 THE MOST ECONOMIC AND ENVIRONMENTALLY SAFEST STRATEGY FOR CONTROLLING POTATO LEAFROLL VIRUS (PLRV) IS THE USE OF RESISTANT POTATO GENOTYPES. IN THIS STUDY, USING A RANDOMIZED COMPLETE BLOCK DESIGN IN A FIELD TRIAL, THE INFECTION RATES OF 12 POTATO GENOTYPES TO PLRV WERE EVALUATED. EACH PLOT OF THE DESIGN CONSISTED OF FIVE PLANTS OF EACH POTATO GENOTYPE OR CULTIVAR. INOCULATION OF TEST PLANTS WITH THE VIRUS WAS DONE BY PUTTING 10 PLRV-CARRYING APHIDS ON EACH TEST PLANT. THE APHIDS WERE THEN KILLED BY INSECTICIDE APPLICATION. ONE MONTH LATER USING BOTH SYMPTOM DEVELOPMENT AND THE ENZYME-LINKED IMMUNOSORBENT ASSAY (ELISA) TEST THE STATUS OF TEST PLANTS REGARDING TO INFECTION WITH PLRV WERE EVALUATED. SIGNIFICANT DIFFERENCES WERE FOUND BETWEEN THE PLRV-INFECTION RATES OF THE POTATO GENOTYPES TESTED. THE GENOTYPE 803970/13 WAS EVALUATED AS HIGHLY RESISTANT TO PLRV. THE CULTIVAR SANTE WAS RESISTANT AND THE CULTIVAR LADY ROSETTA AND THE GENOTYPE 397015/31 WERE MODERATELY RESISTANT. THE REST OF GENOTYPES OR CULTIVARS WERE MODERATELY SUSCEPTIBLE, SUSCEPTIBLE OR HIGHLY SUSCEPTIBLE. MOREOVER, A SIGNIFICANT CORRELATION (79%) BETWEEN THE INFECTION RATES OF THE TEST PLANTS BASED ON SYMPTOM DEVELOPMENT AND THOSE OF THE ELISA TESTS WAS FOUND.

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