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A native Australian grass that “plays dead” during droughts and selectively culls its own cells to survive could provide genetic keys to help world food crops like chickpea withstand global climate change.
QUT researchers have been studying the native grass, Tripogon loliiformis, because of its amazing ability to survive extreme environmental stresses.
Like other so-called ‘resurrection plants’, the grass has the ability to withstand desiccation (being dried out) for prolonged periods but can be revived by water.
(Resurrection plant being brought back to life after receiving a small amount of water: Link to video)
But scientists have never known how these plants actually do it – or if the existing plant cells really do come alive again from a dormant state, or if its new growth is separate from the old cells.
In a paper published today (December 4, Brisbane time) in PLOS Genetics, QUT scientists Professor Sagadevan Mundree, Dr Brett Williams and their fellow researchers have proved sugar manipulation and the controlled sacrifice of cells are keys to the native grass’s survival.
Previous experiments elsewhere had found that even after losing over 95 per cent of its relative water content, the dead-looking outback Queensland grass was still alive and pre-existing tissues again flourished when provided with water.
They found the grass (when hit by drought stress) accumulate trehalose (a non-reducing sugar found in plants) which it then used to trigger autophagy – a process which allows the orderly degradation and recycling of plant cells.
Professor Mundree said autophagy was primarily a survival mechanism that allowed removal of damaged proteins and recycling of nutrients, however, prolonged stress could result in excessive autophagy and death.
“The resurrection plant controls the levels of autophagy to prevent death upon drying,” Professor Mundree said.
“Our analysis directly linked the accumulation of trehalose with the onset of autophagy in dehydrated and dried out T. loliiformis shoots.
“Presumably, once induced, autophagy promotes desiccation tolerance in the grass, by recycling nutrients and removing cellular toxins to suppress programmed cell death.
“These findings illustrate how resurrection plants manipulate sugar metabolism to promote desiccation tolerance and may provide candidate genes that are potentially useful for the development of stress tolerant crops.”
Dr Williams said the research had implications for global food crops such as chickpea and rice.
“It’s an important step along a genetic path that we hope will lead to scientists being able to develop more robust crop varieties that can withstand the uncertainty of climate change whilst still producing maximum yields,” he said.
“Global climate change, increasingly erratic weather and a burgeoning global population are significant threats to the sustainability of future crop production, but resurrection plants present great potential for the development of stress tolerant crops.”
The research team includes Professor Mundree, Dr Williams, Dr Lalehvash Moghaddam, Isaac Njaci and Hao Long (all from QUT’s Centre for Tropical Crops and Biocommodities), who also collaborated with Distinguished Professor Martin Dickman and Assistant Professor Xiuren Zhang (both from the Institute for Plant Genomics and Biotechnology, Texas A&M University).
The article Trehalose Accumulation Triggers Autophagy During Plant Desiccation can be accessed here: http://ow.ly/Vs5MK
Media contact: Mechelle McMahon, QUT media officer, 07 3138 9449 or firstname.lastname@example.org or Rose Trapnell, 0407 585 901.
Professor Sagadevan Mundree, Dr Brett Williams and Hao Long inspecting chickpea plants. Their discovery of how the Australian native resurrection plant can withstand drought will have big impacts on ongoing food security research.