Volume 50 Number 2 Article 14
Year 1996 Month 4
Title: Response of Papaya Cultivars to Inoculation with the SMN Papaya Ringspot Viral Strain
Author: L.-S. Chang
Abstract:
Field trials with a wide range of papaya
(Carica papaya) cultivars inoculated with tne
severe mottle and necrosis (SMN) papaya ringspot
virus (PRV} were evaluated with no control
of natural aphid populations.
It revealed significant differences in disease severity, ELISA read
ings, and plant growth rate.
Survival rate and
symptom development significantly differ
among genotypes. 'Sunrise, 'Mardi' and 'Ostream'
were mostly susceptible to SMN strain
of PRV. There were no marketable yield in the
study.
Different sources of 'Cariflora' lines performed similarly.
These cultivars tolerated the
SMN viral strain, in agreement with reported
tolerance in Florida.
Monoclone antibodies were
applied to distinguish viral strains in healthy
looking plants seven months after planting.
The
extracted sap of healthy-looking plants was
inoculated into susceptible hosts to detect plants
responding to specific viral infection.
This procedure showed that infection of healthy-looking
plants was due to severe virulent strains of SMN
and severe mottle and deformed (SMD) ringspot
virus.
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