Rare phytomyxid infection on the alien seagrass Halophila stipulacea in the southeast Aegean Sea

 
This item is provided by the institution :

Repository :
Mediterranean Marine Science  | ΕΚΤ eJournals
see the original item page
in the repository's web site and access all digital files if the item*
share




2018 (EN)
Rare phytomyxid infection on the alien seagrass Halophila stipulacea in the southeast Aegean Sea (EN)

VOHNÍK, MARTIN
ÖZBEK, ELIF ÖZGÜR
BOROVEC, ONDŘEJ
OKUDAN ASLAN, EMINE ŞÜKRAN

Faculty of Science, Charles University (MŠMT LO1417) (EN)
Institute of Botany CAS (RVO 67985939) (EN)

Phytomyxids (Phytomyxea) are obligate endosymbionts of many organisms such as algae, diatoms, oomycetes and higher plants including seagrasses. Despite their supposed significant roles in the marine ecosystem, our knowledge of their marine diversity and distribution as well as their life cycles is very limited. Here we describe anatomy and morphology of several developmental stages of a phytomyxid symbiosis recently discovered on the petioles of the alien seagrass Halophila stipulacea (Forssk.) Asch. at a locality in the southeast Aegean Sea. Its earliest whitish stages appeared already on the youngest leaves at the apex of the newly formed rhizomes. The infected host cells grew in volume being filled with plasmodia which resulted in the formation of characteristic macroscopic galls. The plasmodia eventually cleaved into spores and in the final stage recorded by us, the dark brown to black galls contained mature resting spores often occurring in duplexes and possessing thick verrucous outer walls. Based on its anatomo-morphological features the phytomyxid was assigned as Plasmodiophora cf. halophilae. Little is so far known about the origins and eco-physiological functioning of this rare symbiosis. However, seemingly similar infection patterns were reported in 1913 on Halophila ovalis (R. Br.) Hook. f. from Java and in 1995 on H. stipulacea from Sicily. Since H. stipulacea is of the Indo-Pacific origin and no phytomyxid infection was observed on the co-occurring autochthonous seagrass Cymodocea nodosa, we hypothesize that its phytomyxid might have co-migrated into the Mediterranean through the Suez Canal, potentially reaching as far as the southern Ionian Sea. (EN)

info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
SCUBA sampling, stereomicroscopy, light and fluorescence and scanning electron and transmission electron microscopy (EN)

seagrasses (EN)
seagrass symbionts (EN)
alien species (EN)
Lessepsian migrants (EN)
phytomyxid biology (EN)
Halophila stipulacea (EN)
Phytomyxids (EN)
Plasmodiophora halophilae (EN)

Ελληνικό Κέντρο Θαλασσίων Ερευνών (ΕΛΚΕΘΕ) (EL)
Hellenic Centre for Marine Research (HCMR) (EN)

Mediterranean Marine Science

2018-01-17


Hellenic Centre for Marine Research (EN)

Halophila stipulacea leaves infected with a phytomyxid (EN)
Mediterranean Sea (EN)
recent samples, comparision with historic (from 1913) (EN)

1791-6763
1108-393X
Mediterranean Marine Science; Vol 18, No 3 (2017); 433-442 (EL)
Mediterranean Marine Science; Vol 18, No 3 (2017); 433-442 (EN)

Copyright (c) 2017 Mediterranean Marine Science (EN)



*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)