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http://dx.doi.org/10.5423/PPJ.2012.28.2.191

Migration and Distribution of Graft-inoculated Jujube Witches'-broom Phytoplasma within a Cantharanthus roseus Plant  

Lee, Sang-Hun (Department of Plant Medicine, Chungbuk National University)
Kim, Chul-Eung (Department of Plant Medicine, Chungbuk National University)
Cha, Byeong-Jin (Department of Plant Medicine, Chungbuk National University)
Publication Information
The Plant Pathology Journal / v.28, no.2, 2012 , pp. 191-196 More about this Journal
Abstract
Periwinkle seedlings (Cantharanthus roseus) were inoculated with jujube witches'- broom (JWB) phytoplasma via grafting to analyze the migration of JWB phytoplasmas within the host plant. The phytoplasmas were detected using nested polymerase chain reaction (PCR) and fluorescence microscopy. Fluorescence microscopy was a simple and easy method of detecting phytoplasmas; however, it was not sufficiently sensitive to detect very low phytoplasma concentrations. Therefore, the migration of JWB phytoplasma was investigated through PCR. The first migration of JWB phytoplasma from an infected tissue to healthy tissues occurred late. After grafting, the phytoplasmas moved from the inoculated twig (or scion) to the main stem, which took 28 days. Afterward, the phytoplasma migrated faster and took less than 4 days to spread into the roots from the main stem. All twigs were then successively colonized by the JWB phytoplasmas from the bottom to the top. JWB phytoplasma was detected via nested PCR in all parts of the periwinkle seedling 82 days after inoculation. Based on these results, the inoculated JWB phytoplasma appeared to migrate downward to the roots along the main stem during the early stages, and then continued to move upward, colonizing twigs along the way until they reached the apex.
Keywords
grafting; migration; nested PCR; periwinkle; phytoplasma;
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