Photosynthetica 2000, 38(1):7-12 | DOI: 10.1023/A:1026775319916

Drought Effects on Membrane Lipids and Photosynthetic Activity in Different Peanut Cultivars

J.A. Lauriano1, F.C. Lidon2, C.A. Carvalho3, P.S. Campos3, M. do Céu Matos3
1 Faculdade de Ciências Agrárias, Universidade Agostinho Neto, Huambo, Angola
2 Sector de Biologia Vegetal, Faculdade de Ciências e Tecnologia -, Universidade Nova de Lisboa, Monte-da-Caparica, Portugal
3 Departamento de Fisiologia Vegetal, Estação Agronómica Nacional, Oeiras, Portugal

The effects of drought on thylakoid acyl lipid composition, photosynthetic capacity (P max), and electrolyte lekage were evaluated in two-months-old peanut cultivars (57-422, 73-30, GC 8-35) growing in a glasshouse. For lipid studies, plants were submitted to three treatments by withholding irrigation: control (C), mild water stress (S1), and severe water stress (S2). Concerning membrane and photosynthetic capacity stability, drought was imposed by polyethylene glycol (PEG 600). In the cv. 73-30 a sharp decrease in the content of thylakoid acyl lipids was observed, already under S1 conditions, whereas cv. 57-422 was strongly affected only under S2. Cv. GC 8-35 had the lowest content of acyl lipids under control conditions, a significant increase under S1 conditions, and only under S2 a decrease occurred. Thus concerning lipid stability, cv. 73-30 was the most sensitive. Among lipid classes, phospholipids and galactolipids were similarly affected, as was MGDG relatively to DGDG. Water deficit imposed by PEG induced a higher increase in electrolyte leakage in cv. 73-30 than in the other cvs. A positive relationship between acyl lipid concentration and membrane integrity was found in all studied cvs. A positive association between acyl lipid concentration, membrane integrity, and P max was found in the cvs. 57-422 and 73-30.

Additional key words: Arachis hypogaea; digalactosyldiacylglycerol; galactolipids; membrane stability; monogalactosyldiacylglycerol; phosphatidylglycerol; phosphatidylinositol; phospholipids; polyethylene glycol; water deficit

Prepublished online: October 1, 2000; Published: April 1, 2000  Show citation

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Lauriano, J.A., Lidon, F.C., Carvalho, C.A., Campos, P.S., & do Céu Matos, M. (2000). Drought Effects on Membrane Lipids and Photosynthetic Activity in Different Peanut Cultivars. Photosynthetica, 38(1), 7-12. doi: 10.1023/A:1026775319916
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