Naslov
BIOCONTROL OF CHESTNUT BLIGHT: (IN)STABLE INFECTION OF THE CHESTNUT BLIGHT FUNGUS BY CRYPHONECTRIA HYPOVIRUS 1

Autori
Ćurković Perica, Mirna ; Ježić, Marin ; Karin, Valentina ; Idzojtic, Marilena ; Sotirovski, Kiril ; Risteski, Mihailo ; Rigling, Daniel ; Prospero, Simone ; Kolp, Matthew ; Double, Mark

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Sažetci objavljeni samo na mrežnim stranicama kongresa / - , 2017

Skup
FEMS 2017 7th Congress of European Microbiologists

Mjesto i datum
Valencia, Španjolska, 09.07.2017. - 13.07.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
chestnut blight, biocontrol, hypovirus

Sažetak
Backgrounds Chestnut blight is a disease caused by the plant pathogenic fungus Cryphonectria parasitica, which induces bark lesions (cankers) on stems and branches of chestnut (Castanea) species. The pathogen is successfully controlled by a double-stranded RNA mycovirus Cryphonectria hypovirus 1 (CHV1), which reduces virulence and reproductive capacities of the fungus, a phenomenon called hypovirulence. If the virus is introduced naturally or artificially into an active canker caused by virulent C. parasitica strain(s), canker expansion ceases and the canker calluses resulting in a so-called healed canker. High prevalence of CHV1 in C. parasitica populations often results in the recovery of chestnut forests. Therefore, it is important that CHV1-infected fungal strains persist on chestnut trees over years. Objectives The aim of this study was to investigate the persistence of hypovirulent C. parasitica strains in completely healed, callused chestnut blight cankers. Methods Bark samples were collected in seven blighted chestnut stands (six in Europe and one in North America) from more than 100 healed bark cankers. Conclusions The frequency of hypovirulent C. parasitica strains in sampled cankers varied substantially between different populations. Virulent C. parasitica strains were more frequent than hypovirulent ones in healed cankers, which was unexpected because CHV1-infected strains are thought to promote canker healing. The relationship between virulent and hypovirulent fungal strains in healed cankers appears to be highly dynamic. We suspect that in some cases the loss of vigor by hypovirulent C. parasitica strains leaves a niche for virulent ones to re-invade the already healed cankers.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Šumarstvo

POVEZANOST RADA