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Chemical changes and O 2 ˙− production in thylakoid membranes under water stress
Author(s) -
Sgherri Cristima Luisa Maria,
Pinzino Calogero,
NavariIzzo Flavia
Publication year - 1993
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1993.tb00144.x
Subject(s) - thylakoid , membrane , stress (linguistics) , chemistry , water stress , biophysics , environmental chemistry , botany , biology , chloroplast , biochemistry , gene , linguistics , philosophy
Sunflower seedlings ( Helianthus annuus cv. Isabel) subjected to a moderate level of water stress showed a reduced growth and a 0. 1 MPa osmotic adjustment came into play. Thylakoid membranes isolated from stressed leaves showed decreased chlorophyll (Chl) and protein contents but the Chl al /Chl b and protein/Chl ratios were unchanged. Water stress caused a preferential hydrolysis in thylakoid proteins: the hydrophilic to hydrophobic protein ratio increased from 0. 8 in the control to 4. 5 in the stressed plants. However, the degree of unsaturation was unchanged and the electron spin resonance (ESR) measurements did not show an increased level of O 2 .‐ radical production by photosynthetic membranes.