Seawater stress applied at germination affects mitochondrial function in durum wheat (Triticum durum) early seedlings

Functional Plant Biology : FPB
Zina FlagellaDonato Pastore

Abstract

Seawater stress effects on mitochondrial ATP synthesis and membrane potential (ΔΨ) were investigated in germinating durum wheat seedlings under moderate (22% seawater osmolarity, -0.62 MPa) and severe (37% seawater osmolarity, -1.04 MPa) stress. To estimate the osmotic component of salt stress, mannitol solutions (0.25 and 0.42 m) iso-osmotic with the saline ones were used. Moderate stress intensity only delayed mean germination time (MGT), whereas higher seawater osmolarity reduced germination percentage as well. In contrast, Na+ and Cl- accumulation showed a sharp increase under moderate stress and only a small further increase under severe stress, which was more pronounced for Cl-. Only severe stress significantly damaged succinate-dependent oxidative phosphorylation, which may be related to the stress-induced alteration in inner mitochondrial membrane permeability, as indicated by changes in ΔΨ profiles. Proline-dependent oxidative phosphorylation, however, was inhibited under moderate stress. This suggests the occurrence of an adaptation mechanism leading to proline accumulation as an osmoprotectant. Moreover, both the osmotic and the toxic components of seawater stress were detrimental to oxidative phosphorylation. Damage...Continue Reading

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Citations

May 31, 2008·Plant & Cell Physiology·Maura Nicoletta LausDonato Pastore
Mar 26, 2009·Journal of Plant Research·Valya VassilevaUrs Feller
Feb 1, 2011·Functional Plant Biology : FPB·Petronia CarilloRonan Sulpice
Aug 28, 2013·BMB Reports·Donato PastoreDaniela Trono
Dec 20, 2014·GM Crops & Food·R K Maiti, Pratik Satya
May 14, 2014·International Journal of Molecular Sciences·Daniela TronoDonato Pastore
Jul 1, 2008·Functional Plant Biology : FPB·Petronia CarilloAmodio Fuggi
Jan 12, 2011·Cellular Physiology and Biochemistry : International Journal of Experimental Cellular Physiology, Biochemistry, and Pharmacology·Umberto De MarchiIldikò Szabò
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Dec 18, 2013·Analytical and Bioanalytical Chemistry·Anna Laura CapriottiAldo Laganà
Apr 3, 2016·Free Radical Biology & Medicine·Katie L LiberatoreShahryar F Kianian

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Methods Mentioned

BETA
ion exchange chromatography
environmental stress
salt stress

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