A step toward making crops drought tolerant

March 28, 2017, Queensland University of Technology
A step toward making crops drought tolerant
Xerophyta viscosa plants, dried for 25 days until less than 5% relative water content (left) and after 5 days of watering (right). Credit: Queensland University of Technology

QUT researchers are part of an international consortium of researchers whose work hopes to future-proof crops against the impacts of global climate change.

The researchers have sequenced the genome of the 'resurrection plant' Xerophyta viscosa, revealing a genetic 'footprint' of the plant's ability to tolerate for long periods of time.

The research team is led by Henk Hilhorst of Wageningen University & Research in the Netherlands and includes QUT researchers Professor Sagadevan Mundree and Dr Brett Williams as well as other researchers from the Netherlands, South-Africa and the USA.

The team hopes their results will contribute to the faster development of that are resilient enough to cope with foreseen global climate changes.

The team's DNA sequence of the resurrection plant is published today in Nature Plants.

The consortium chose to study the plant, which is native to southern Africa, because of its amazing capability to survive complete drying.

Research leader Henk Hilhorst said food crops that can survive extreme drought are, and will be, of increasing importance.

"Climate change causes longer and extremer periods of drought, while at the same time the growing world population demands a dramatic increase of food production," he said.

"Resurrection species like Xerophyta viscosa may serve as ideal models for the ultimate design of with enhanced drought tolerance."

The team studied changes in during dehydration, in order to find genes which enable the plant to survive desiccation.

QUT Centre for Tropical Crops and Biocommodities director, Professor Sagadevan Mundree, said his team's work, which revealed how a native Australian grass could be brought back from the 'dead', made QUT researchers ideal partners for this project.

"During periods of extreme dryness the Australian grass Tripogon loliiformis goes through a similar process of dessication in which autophagy is triggered, a process by which the plant degrades and recycles its own contents.

"The plant constantly removes damaged proteins and toxins while recycling nutrients and this prevents the plant leaf tissue from dying," Professor Mundree said.

Explore further: Scientists unlock secrets of Aussie 'resurrection' grass

More information: Maria-Cecília D. Costa et al. A footprint of desiccation tolerance in the genome of Xerophyta viscosa, Nature Plants (2017). DOI: 10.1038/nplants.2017.38

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