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Physiological responses of different olive genotypes to drought conditions

100%

Bacelar E. A., Moutinho-Pereira J. M., Goncalves B. C., Lopes J. I., Correia C. M.

Acta Physiologiae Plantarum

2009

tom 31

nr 3

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.

Salicylic acid increases drought adaptability of olive trees by changes on redox status and ionome

86%

Brito C., Dinis L. T., Ferreira H., Goncalves A., Coutinho J., Moutinho-Pereira J., Correia C. M.

Acta Physiologiae Plantarum

2018

tom 40

nr 11-11th International Conference Plant Functioning under Environmental Stress...

Effects of Open-Top Chambers on physiological and yield attributes of field grown grapevines

86%

Moutinho-Pereira J. M., Bacelar E. A., Goncalves B., Ferreira H. F., Coutinho J. F., Correia C. M.

Acta Physiologiae Plantarum

2010

tom 32

nr 2

Touriga Franca grapevines were grown in Open-Top Chamber (OTC) and in outside plot (Exterior) for 3 years (2004–2006) to investigate the impact of these structures on climatic conditions and, consequently, on physiological and yield attributes. In general, CO₂ assimilation, stomatal conductance, carbohydrate concentration, maximum bulk modulus of elasticity, palisade parenchyma thickness, leaf mass per unit area and values of red/far-red ratio transmitted by leaves were lower, whereas intrinsic water use efficiency, SPAD-readings and osmotic potential at full turgor were higher in OTC leaves. However, OTC did not affect leaf water potential, maximum PSII photochemical efficiency, stomatal density and soluble proteins concentration. Also, there were no significant differences in C, P, Ca and Fe between treatments. Meanwhile, N and Mg were higher, whereas K concentration was lower in OTC leaves. The environmental conditions inside OTC provided a significant reduction in yield and Ravaz index of 2004, mainly due to a decrease in clusters weight. Regarding the vegetative growth parameters, OTC did not influence the pruning weight, but in 2006 the weight/shoot was significantly lower in OTC vines. In conclusion, the use OTC facility to study the impact of CO₂ enrichment was very expedite, but the extrapolation of results to the open-field environment must be prudent due to the OTC effect.

Ograniczanie wyników

3 Acta Physiologiae Plantarum

3 Correia C. M.

2 Bacelar E. A.

2 Moutinho-Pereira J. M.

1 Brito C.

1 Coutinho J.

1 Coutinho J. F.

1 Dinis L. T.

1 Ferreira H.

1 Ferreira H. F.

1 Goncalves A.

1 Goncalves B.

1 Goncalves B. C.

1 Lopes J. I.

1 Moutinho-Pereira J.

1 2018

1 2010

1 2009

Wyniki wyszukiwania

Physiological responses of different olive genotypes to drought conditions

Salicylic acid increases drought adaptability of olive trees by changes on redox status and ionome

Effects of Open-Top Chambers on physiological and yield attributes of field grown grapevines