Journal
JOURNAL OF PHYTOPATHOLOGY
Volume 157, Issue 7-8, Pages 438-445Publisher
WILEY
DOI: 10.1111/j.1439-0434.2008.01512.x
Keywords
Phytophthora cryptogea zoospores; specific primers; polymerase chain reaction; SYBR Green real-time PCR
Categories
Funding
- Italian Ministry for University
- PRIN 2003 [2003074533]
- Italian Ministry for Environment, Land and Sea
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In this work, a protocol for zoospores production of Phytophthora cryptogea, an economically important plant pathogen was optimized. Five different concentrations of zoospores (5 x 10(5), 5 x 10(4), 5 x 10(3), 5 x 10(2), 5 x 10(1) zoospores/ml) from four different isolates of P. cryptogea (Maria 1, Maria 2, S3 1-A, Amazzone) were used as inoculum on pot marigold (Calendula officinalis) and gerbera (Gerbera jamesonii) plants. Maria 1 was the most virulent isolate both on pot marigold and gerbera plants according to disease severity. A rapid and sensitive pathogen DNA extraction protocol suitable for large quantities of plant samples was adopted. Conventional polymerase chain reaction (PCR) was able to detect the pathogen in artificially inoculated symptomless pot marigold (collected day 12) and gerbera plants (day 8) after pathogen inoculation, with the suspension of 5 x 10(5), 5 x 10(4), 5 x 10(3)P. cryptogea zoospores/ml. Real-time PCR showed the possibility to detect the pathogen in artificially inoculated symptomless pot marigold (collected day 8) and gerbera plants (day 4) after pathogen inoculation, with the suspension of 5 x 10(5), 5 x 10(4)P. cryptogea zoospores/ml. The first symptoms appeared on pot marigold plants 14 days after pathogen inoculation and on gerbera plants 10 days after inoculation. Real-time PCR showed the possibility to detect the pathogen 4 days before conventional PCR and 6 days before the appearance of disease symptoms both on pot marigold and gerbera plants.
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