Genotypic variation of physiological and morphological traits of seven olive cultivars under sustained and cyclic drought in Mendoza, Argentina
| Autor: | Carlos M. Puertas, Octavio Contreras-Zanessi, Víctor Beyá-Marshall, Eduardo R. Trentacoste |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Stomatal conductance Specific leaf area fungi Deficit irrigation food and beverages Soil Science 04 agricultural and veterinary sciences Biology 01 natural sciences Chlorophyll meter Water deficit Agronomy 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Cultivar Agronomy and Crop Science Water use 010606 plant biology & botany Earth-Surface Processes Water Science and Technology |
| Zdroj: | Agricultural Water Management. 196:48-56 |
| ISSN: | 0378-3774 |
| DOI: | 10.1016/j.agwat.2017.10.018 |
| Popis: | The effects of two deficit irrigation regimes on the physiological, morphological, vegetative, and reproductive traits of seven olive cultivars were studied in a pot experiment. Specific leaf area (SLA) and SPAD chlorophyll meter reading (SCMR) were measured over the experimental period. Their relationships with physiological traits and with each other were also tested. Three-year-old plants in pots were subjected to control regime (CI replaced daily water use), sustained deficit regime (SDI was applied daily at 35% of CI), and five successive drought cycles of 30 days followed by rewatering (CDI). In all cultivars, SDI decreased stem water potential compared to CI. Under CDI, stem water potential reached the minimum, ∼–8 MPa, but all cultivars recovered to potentials similar to the rewatering period. Stomatal conductance was significantly reduced in both deficit irrigation regimes compared to the control. Rewatering caused a slower recovery of stomatal conductance in ‘Seleccion Mendoza’, ‘Villalonga’ and ‘Arbequina’ than in the rest of cultivars. Across cultivars, specific leaf area decreased with water deficit, while SCMR increased. Specific leaf area was positively related with stem water potential (R2 = 0.60), stomatal conductance (R2 = 0.44) and trunk growth (R2 = 0.31). In contrast, SCMR values were negatively related with stem water potential (R2 = 0.59), stomatal conductance (R2 = 0.52) and trunk growth (R2 = 0.62). ‘Changlot’, ‘Arauco’ and ‘Nevadillo Blanco’ cultivars maintained lower SLA and higher SCMR under both deficit irrigation regimes and higher stomatal conductance recovery after rewatering. These cultivars also appear to be better adapted to drought prone environments. |
| Databáze: | OpenAIRE |
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