Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of a 16SrI-C phytoplasma infecting celery (Apium graveolens) with stunting, bushy top and phyllody in the Czech Republic.

Abstract

Apium graveolens L. plants showing stunting, purplish/whitening of new leaves, flower abnormalities and bushy tops were observed in South Bohemia (Czech Republic) during 2011 and 2012. Transmission electron microscopy observations showed phytoplasmas in phloem sieve tube elements of symptomatic but not healthy plants. Polymerase chain reactions with universal and group-specific phytoplasma primers followed by restriction fragment length polymorphism analyses and sequencing of 16 S rDNA enabled classification of the detected phytoplasmas into the aster yellows group, ribosomal subgroup 16SrI-C. Identical analyses of the ribosomal protein genes rpl22 and rps3 were used for further classification and revealed affiliation of the phytoplasmas with the rpIC subgroups. This is the first report of naturally occurring clover phyllody phytoplasma in A. graveolens in both the Czech Republic and worldwide.