Improved PCR detection of potyviruses in <Emphasis Type="Italic">Allium</Emphasis> species |
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Authors: | Pablo?Lunello Daniel?Ducasse Email author" target="_blank">Vilma?ConciEmail author |
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Institution: | (1) Department of Biotechnology, INIA, Autopista A-6, km 7, 28040 Madrid, Spain;(2) Instituto de Fitopatología y Fisiología Vegetal, Instituto Nacional de Tecnología Agropecuaria (IFFIVE-INTA), Camino 60 cuadras km 5&frac; (5119), Córdoba, Argentina |
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Abstract: | Protocols for producing virus-free Allium plants require an indexing system that is more sensitive than DAS-ELISA and can detect low virus concentrations in infected plants. In the present work, degenerate primers were designed and a one-step IC-RT-PCR protocol was developed to differentiate between Leek yellow stripe virus (LYSV) and Onion yellow dwarf virus (OYDV) in single and mixed infections in several Allium spp. A 566-bp band was observed for LYSV, a 489-bp band for OYDV in single infections, and two bands of the same sizes in mixed infections in different species of Alliaceae. A 508-bp band of Shallot yellow stripe virus and a 594-bp band of Turnip mosaic virus were also amplified with the same primers. RT-nested-PCR was also conducted directly in microtitre plate wells after negative or questionable reactions were produced in an ELISA experiment. The detection limit of the DAS-ELISA for LYSV was 16.5–27.3 ng ml−1. The RT-nested-PCR done after DAS-ELISA was 102 times more sensitive than the DAS-ELISA alone. In parallel, an IC-RT-nested-PCR in microcentrifuge tubes was 104 times more sensitive than the DAS-ELISA. The DAS-ELISA-RT-nested-PCR enables the initial screening of samples by DAS-ELISA to eliminate a high percentage of virus-positive plants, considerably reducing the number of plants to analyze further by RT-PCR. |
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Keywords: | Alliaceae garlic indexing Leek yellow stripe virus molecular tests Onion yellow dwarf virus RT-PCR Shallot yellow stripe virus Turnip mosaic virus |
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