Mitochondrial uncoupling protein 1 overexpression increases yield in Nicotiana Tabacum under drought stress by improving source and sink metabolism

Barreto, Pedro and Yassitepe, Juliana E.C.T. and Wilson, Zoe A. and Arruda, Paulo (2017) Mitochondrial uncoupling protein 1 overexpression increases yield in Nicotiana Tabacum under drought stress by improving source and sink metabolism. Frontiers in Plant Science . ISSN 1664-462X (In Press)

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Abstract

Mitochondrial uncoupling proteins (UCPs) sustain mitochondrial respiration independent of intracellular ATP concentration. Uncoupled respiration is particularly beneficial under stress conditions, during which both photosynthesis and respiration may be impaired. Sustaining carbon fixation during the reproductive phase is essential for plants to develop viable pollen grains and for seed setting. Here, we examined whether UCP1 overexpression (UCP1-oe) would help tobacco plants cope with drought stress during reproductive development. We observed that WT and UCP1-oe plants lost water at the same rate under moderate drought stress, but that UCP1-oe lines regained water faster upon rewatering. UCP1-oe plants maintained higher levels of respiration and photosynthesis and decreased H2O2 content in the leaves during the drought stress period. We examined whether UCP1-oe impacts reproductive tissues and seed production by monitoring the progress of flower development, focusing on the early stages of pollen formation. UCP1-oe lines induced the expression of mitochondrial genes and increased mtDNA content in reproductive tissues, which increased the consumption of carbohydrates and reduced H2O2 content and pollen disturbances. Finally, the beneficial impact of UCP1-oe on the source and sink organs resulted in an increased seed size and number under both control conditions and drought stress.

Item Type: Article
Additional Information: This Document is Protected by copyright and was first published by Frontiers. All rights reserved. It is reproduced with permission.
Keywords: UCP1, drought stress, mitochondria, photosynthesis, yield
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences
Identification Number: 10.3389/fpls.2017.01836
Depositing User: Eprints, Support
Date Deposited: 13 Oct 2017 11:07
Last Modified: 15 Oct 2017 00:54
URI: http://eprints.nottingham.ac.uk/id/eprint/47260

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