Changes in lipid composition, water relations and gas exchange in leaves of two young ‘Chemlali’ and ‘Chetoui’ olive trees in response to water stress
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The comparative responses of two young olive trees (Olea europaea L. ‘Chemlali’ and ‘Chetoui’) to drought stress were investigated during 1 month. Three-month-old own-rooted plants were subjected to two irrigation treatments: WW (well watered plants that were irrigated with fresh water to maintain a soil water content close to field capacity), and WS (water stressed plants by withholding water). Leaf water potential, gas exchange and leaf lipid composition were studied. ‘Chemlali’ was able to maintain higher leaf CO2 assimilation rate and leaf stomatal conductance throughout the drought cycle compared to ‘Chetoui’. Water stress induced a larger decrease in the total lipid content in ‘Chetoui’ than in ‘Chemlali’. Interestingly, the constitution of different lipid classes was highly altered in ‘Chetoui’. Lipid changes in Chemlali, a drought tolerant cultivar, revealed more stability of its cellular membranes to drought stress as compared to the drought susceptible olive cultivar, Chétoui. Furthermore, in comparison to the controls, drought stressed plants showed an increase in the degree of unsaturation of leaf lipids in the two olive cultivars. Moreover, the results observed in Chemlali showed that besides changes in lipids composition this cultivar may have an efficient defence strategy which can be related on antioxidative production against oxidative stress.
KeywordsDrought stress Fatty acids Leaf lipids Olea europaea L.
- Boujnah D (1997) Variations morphologiques anatomiques et écophysiologiques en rapport avec la résistance à la sécheresse chez l'olivier (Olea europaea L.). Ph.D Thesis. University of Gent, BelgiumGoogle Scholar
- Chen SY, Liu J (1991) The effect of water stress on membrane fluidity of leaf mitochodria of sugarcane and its relation to membrane lipid peroxidation. Acta Phytophysiol Sinica 17:285–289Google Scholar
- Douce R (1964) Identification et dosage de quelques glycérophosphatides dans des souches normales et tumorales de scosonères cultivés in vitro. C R Acad Sci Paris 259:3066–3068Google Scholar
- Gimenez C, Fereres E, Ruz C, Orgaz F (1997) Water relations and gas exchange of olive trees: diurnal and seasonal patterns of leaf water potential, photosynthesis and stomatal conductance. Acta Hortic 449:411–415Google Scholar
- Gregoriou K (1999) Shading effect in photosynthesis of olive, cv. ‘‘Koroneiki’’, and the implications in shoot and fruit production. PhD Thesis, Agricultural University of Athens, GreeceGoogle Scholar
- Guerfel M, Baccouri B, Boujnah D, Zarrouk M (2007) Seasonal changes in water relations and gas exhange in leaves of two Tunisian olive (Olea europaea L.) cultivars under water deficit. J Hortic Sci Biotechnol 82:721–726Google Scholar
- Harwood JL (1998) Environmental effects on plant lipid biochemistry. In: Harwood JL (ed) Plant lipid biosynthesis—fundamentals and agricultural applications. Cambridge University Press, Cambridge, pp 305–363Google Scholar
- Murphy DJ (1986) The molecular organization of the photosynthetic membranes of higher plants. Biochim Biophys Acta 864:33–94Google Scholar
- Nouairi I, Ben Ammar W, Ben Youssef N, Ben Miled Daoud D, Ghorbel MH, Zarrouk M (2006) Comparative study of cadmium effects on membrane lipid composition of Brassica juncea and Brassica napus leaves. Plant Sci 130:165–170Google Scholar
- Pham Thi AT, Vieira da Silva J, Mazliak P (1990) The role of membrane lipids in drought resistance of plants. Bull Soc Bot Fr 137:99–144Google Scholar
- Quinn PJ, Willliams WP (1983) The structural role of lipids in photosynthetic membranes. Biochim Biophys Acta 737:223–266Google Scholar