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

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dc.contributorPEDRO BARRETO, Unicamp; JULIANA ERIKA DE C T YASSITEPE, CNPTIA; ZOE A. WILSON, University of Nottingham; PAULO ARRUDA, Unicamp.
dc.creatorBARRETO, P.
dc.creatorYASSITEPE, J. E. de C. T.
dc.creatorWILSON, Z. A.
dc.creatorARRUDA, P.
dc.date2018-01-19T19:09:26Z
dc.date2018-01-19T19:09:26Z
dc.date2018-01-19
dc.date2017
dc.date2018-02-08T11:11:11Z
dc.date.accessioned2026-07-07T04:15:25Z
dc.descriptionMitochondrial 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.
dc.descriptionArticle 1836. Na publicação: Juliana E. C. T. Yassitepe.
dc.identifierFrontiers in Plant Science, v. 8, p. 1-20, Nov. 2017.
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1085852
dc.identifierhttps://doi.org/10.3389/fpls.2017.01836
dc.identifier.urihttp://hdl.handle.net/123456789/455735
dc.languageeng
dc.rightsopenAccess
dc.subjectProteína desacopladora
dc.subjectDrought stress
dc.subjectTabaco
dc.subjectNicotiana tabacum
dc.subjectDeficiência hídrica
dc.subjectFotossíntese
dc.subjectWater stress
dc.subjectMitochondria
dc.subjectPhotosynthesis
dc.subjectYields
dc.titleMitochondrial uncoupling protein 1 overexpression increases yield in Nicotiana tabacum under drought stress by improving source and sink metabolism.
dc.typeArtigo de periódico

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