Flowers on a healthy Rhodamnia zombi tree prior to infection by myrtle rust.
(Photo credit: The University of Queensland )
A recently identified tree species in Queensland has been given the name 'zombie' by scientists who say ambitious assistance is needed to reverse its 'living dead' status.
University of Queensland botanist Professor Rod Fensham said it was a race against time to save Rhodamnia zombi from the fungal disease myrtle rust.
"This species did not have a name when it was first assessed in 2020, and since then 10 per cent of the trees have died and none of those remaining are producing flowers or fruit because of myrtle rust," Professor Fensham said.
"It is a small to medium-sized tree with large dark green leaves, shaggy bark and hairy white flowers growing in rainforests in the Burnett region.
"The bright yellow fungal pathogen attacks and kills off its young shoots over and over again meaning an infected tree can't grow or reproduce and eventually dies."
Myrtle rust was first detected in Australia in 2010 and Rhodamnia zombi has been added to a list of species classified as potentially critically endangered because of the disease.
"Without any intervention, the 17 species on this Category X list will be extinct within a generation," Professor Fensham said.
"None of them appear to have any resistance to myrtle rust or any wild population which is not yet infected."
Professor Fensham, from UQ's School of the Environment , said the wider Rhodamnia genome provided some hope for the zombie tree with related species displaying myrtle rust resistance.
"A survival strategy starts with finding clean cuttings in the wild before myrtle rust attacks them and propagating them to grow at safe sites," he said.
"So far seedlings are being grown by specialists in Lismore and Townsville which look promising, but they need to be constantly vigilant.
"Hopefully once they produce seed, lurking in the next generation of Rhodamnia zombi some resistance will become apparent."
Ultimately, he hopes resistant individuals can be put back into forests to take their place in the ecosystem.
"It's a long shot and ambitious but the species needs time and space without being constantly walloped by myrtle rust to hopefully express some resistance," Professor Fensham said.
"Left to its own devices, the trees in the wild really will be the living dead."
The research has been published in Austral Ecology.
Cuttings from Rhodamnia zombi being propogated at Barung Landcare Nursery in Queensland's Sunshine Coast hinterland which will be treated in the event of a myrtle rust attack in the hope they can grow and mature to produce fruit and seeds.
(Photo credit: Milo Bateman)
