ROUSSEAUX Maria Cecilia
congresos y reuniones científicas
Elevated temperature affects vegetative growth and fruit oil concentration in olive trees
MISERERE, ANDREA; GARCIA-INZA, G. P.; SEARLES, P.S; ROUSSEAUX, M. C.
Congreso; The Eight International Symposium on Olive Growing (ISHS); 2016
International Society of Horticultural Science
Temperature is one ofthe main factors that regulates the growth and development of crops anddetermines their yield. In recent decades, there has been an increase in globaltemperature, which represents a challenge for olive production. Olive trees inArgentina are grown over a wide range of latitude and altitude, and it has beenobserved in warmer areas of the country that some varieties have lower yieldsand greater vegetative growth than in their regions of origin in theMediterranean Basin. Thus, the aim of this study was to evaluate the effect of elevatedtemperature on the vegetative growth and fruit oil concentration of two olive varietiesby directly manipulating temperature. The experiment was conducted at anexperimental station in the province of La Rioja in northwest Argentina. Two temperature levels (a control and aheated treatment; 3 °C above the control) were applied from fruit set untilfinal harvest using open top chambers (OTC) with electronically controlledheating systems. The responses after oneseason of treatment for potted Coratina and Arbequina trees are shown here. Branches that developed in heated OTC elongatedmore than those that developed in the control OTC in both varieties, althoughthe effect was more pronounced in Coratina. On the other hand, elevatedtemperature had a negative effect on fruit dry weight and oil concentration inboth varieties. Elevated temperature reduced fruit dry weight by 0.34 and 0.22g in Coratina and Arbequina, respectively. Additionally, fruit oil concentration (%) was 4.6 and 6.2 % less on adry weight basis in fruit that received elevated temperatures. The results indicate that elevatedtemperature promotes vegetative growth and negatively affects oil concentrationin olive trees under our climate conditions.