Physiological responses of different olive genotypes to drought conditions

• Autorzy: Bacelar E.A. , Moutinho-Pereira J. M. , Goncalves B. C. , Lopes J. I. , Correia C. M.
• Języki publikacji: EN

Abstrakty

EN

Gas exchange rates, chlorophyll fluorescence, pressure–volume relationships, photosynthetic pigments, total soluble sugars, starch, soluble proteins and proline concentrations were investigated in five Olea europaea L. cultivars with different geographical origins (Arbequina, Blanqueta, Cobrançosa, Manzanilla and Negrinha) grown under Mediterranean field conditions. We found considerable genotypic differences among the cultivars. Comparing the diurnal gas exchange rates, we observed that Cobrançosa, Manzanilla and Negrinha had high photosynthetic rate than Arbequina and Blanqueta. The first group reveals to be better acclimated to drought conditions, and appears to employ a prodigal water-use strategy, whereas Blanqueta and Arbequina, with high water-use efficiency, appear to employ a conservative water-use strategy. The degree of midday depression in photosynthesis was genotype dependent, with a maximum in Arbequina and a minimum in Negrinha. The reductions in the photosynthetic rate were dependent from both stomatal and non-stomatal limitations. Elastic adjustment plays an important role as drought tolerance mechanism. The group of cultivars that employ a prodigal water-use strategy revealed high tissue elasticity, whereas Arbequina and Blanqueta revealed high tissue rigidity. We also identified the existence of drought tolerance mechanisms associated with soluble proteins accumulation in the foliage. The high levels of soluble proteins in Arbequina may represent an increased activity of oxidative stress defence enzymes and may also represent a reserve for post stress recovery. In all cultivars, especially in Manzanilla, free proline was accumulated in the foliage. The discussed aspects of drought stress metabolism may have an adaptative meaning, supporting the hypothesis that olive cultivars native to dry regions, such as Cobrançosa, Manzanilla and Negrinha, have more capability to acclimate to drought conditions than cultivars originated in regions with a more temperate climate, like Arbequina and Blanqueta.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2009
• Tom: 31
• Numer: 3
• Opis fizyczny: p.611-621,fig.,ref.

Twórcy

autor

Bacelar E.A.

• Department of Biological and Environmental Engineering, Centre for the Research and Technology of Agro-Environment and Biological Sciences (CITAB), University of Tras-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal

autor

Moutinho-Pereira J. M.

• Department of Biological and Environmental Engineering, Centre for the Research and Technology of Agro-Environment and Biological Sciences (CITAB), University of Tras-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal

autor

Goncalves B. C.

• Department of Biological and Environmental Engineering, Centre for the Research and Technology of Agro-Environment and Biological Sciences (CITAB), University of Tras-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal

autor

Lopes J. I.

• Direccao Regional de Agricultura de Tras-os-Montes, Quinta do Valongo, 5370 Mirandela, Portugal

autor

Correia C. M.

• Department of Biological and Environmental Engineering, Centre for the Research and Technology of Agro-Environment and Biological Sciences (CITAB), University of Tras-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal

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