A nationwide science project that sequenced the manuka genome and is now exploring its genetic diversity may be instrumental in protecting the indigenous plant from the fungal disease myrtle rust.
Using state-of-the-art genome sequencing technologies, Plant & Food Research scientists mapped manuka’s genetic blueprint in 2015 and shared the information with tangata whenua and the New Zealand research community.
The research focus has since moved to using bioinformatic techniques to acquire a detailed understanding of the unique attributes of manuka’s genetic stocks – the data have been gleaned from around 1000 samples of manuka leaf collected nationwide in a collaboration with Landcare Research, the University of Waikato and key Maori partners.
The information generated is providing important scientific insights concerning the distribution and genetic diversity within and between manuka populations in New Zealand.
“A key objective of the project has always been to understand how genetic material is exchanged between manuka populations by pollen and seed dispersal to help whānau and hapū, and the honey industry, to develop unique stories around provenance, and help ensure genetic variation for conservation purposes,” says Plant & Food Research Science Group Leader Dr David Chagné.
“With the arrival of myrtle rust on the New Zealand mainland, we soon realised the need for an additional and more specific conservation application for the project.
“While it’s not clear just what effect myrtle rust will have on mānuka under New Zealand conditions, we should expect differences in susceptibility and resistance across the mānuka populations.
“By using the latest technologies for DNA sequencing and new methodologies for bioinformatic data analysis we can determine which parts of the genome are associated with tolerance.
“This will help us to better predict the potential damage from myrtle rust and determine how fast the various mānuka populations will respond to the disease.
“The data will assist with guiding research priorities for maintaining and protecting diversity in mānuka,” says Dr Chagné.
Research results from the project are expected to be released between June and August this year.
The Maori organisations assisting with stakeholder engagement and commercial support in the project are Ngati Porou Miere, Tuhoe Tuawhenua Trust, Atihau-Whanganui, Taitokerau Miere and Tai Tokerau Honey. The project is funded by the Ministry of Business, Innovation and Employment.