Tripogon loliiformis elicits a rapid physiological and structural response to dehydration for desiccation tolerance
Karbaschi, Mohammad Reza, Williams, Brett, Taji, Acram, & Mundree, Sagadevan (2016) Tripogon loliiformis elicits a rapid physiological and structural response to dehydration for desiccation tolerance. Functional Plant Biology. (In Press)
Resurrection plants can withstand extreme dehydration to an air-dry state and then recover upon receiving water. Tripogon loliiformis (F.Muell.) C.E.Hubb. is a largely uncharacterised native Australian desiccation-tolerant grass that resurrects from the desiccated state within 72 h. Using a combination of structural and physiological techniques the structural and physiological features that enable T. loliiformis to tolerate desiccation were investigated. These features include:
(i) a myriad of structural changes such as leaf folding, cell wall folding and vacuole fragmentation that mitigate desiccation stress;
(ii) potential role of sclerenchymatous tissue within leaf folding and radiation protection;
(iii) retention of ~70% chlorophyll in the desiccated state;
(iv) early response of photosynthesis to dehydration by 50% reduction and ceasing completely at 80 and 70% relative water content, respectively;
(v) a sharp increase in electrolyte leakage during dehydration, and;
(vi) confirmation of membrane integrity throughout desiccation and rehydration.
Taken together, these results demonstrate that T. loliiformis implements a range of structural and physiological mechanisms that minimise mechanical, oxidative and irradiation stress. These results provide powerful insights into tolerance mechanisms for potential utilisation in the enhancement of stress-tolerance in crop plants.
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|Item Type:||Journal Article|
|Keywords:||Tripogon loliiformis, resurrection plant, Desiccation, leaf structure, membrane integrity, photosynthesis, electrolyte leakage|
|Subjects:||Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > PLANT BIOLOGY (060700) > Plant Cell and Molecular Biology (060702)
Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > PLANT BIOLOGY (060700) > Plant Physiology (060705)
|Divisions:||Current > Research Centres > Centre for Tropical Crops and Biocommodities
Current > Schools > School of Earth, Environmental & Biological Sciences
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Facilities:||Science and Engineering Centre, Central Analytical Research Facility|
|Copyright Owner:||Copyright 2016 CSIRO|
|Deposited On:||23 Mar 2016 00:03|
|Last Modified:||23 Mar 2016 23:45|
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