Frost damage in young olive trees cv. Arbequina and Koroneiki treated with L-proline, salicylic acid or biostimulant
DOI:
https://doi.org/10.52945/rac.v36i3.1610Keywords:
Olea europaea, freezing, proline, salicylic acidAbstract
In subtropical climates, young olive trees can be lost due to damages by frost, especially in high altitudes, where
the production potential is greater. Thus, this work aimed to identify chemical treatments that reduce frost damages in
young plants, and test the cultivars Arbequina and Koroneiki for resistance to frost. Two field experiments were carried out in Chapecó, Santa Catarina, Brazil: with 'Koroneiki' plants in 2021; and with 'Arbequina' and 'Koroneiki' in 2022. Three days before the forecasted frost, potted plants were sprayed with L-proline 10g L-1, the compound One.A Pro 15mL L-1, salicylic acid 28mg L-1 and a control (water). Air temperature reached -6.6 and -1.2°C, in 2021 and 2022, respectively, leading the plants, in 2021, to burn shoots, cracks in the trunk, intense sprouting close to the collar (trunk) and death, with increased cellular electrolytes
leakage (CEL) in leaves, including in 2022. Spraying did not significantly prevent damage, while in 2022 'Arbequina' showed significantly lower CEL. It is concluded that 'Arbequina' has lower CEL after a frost and that the tested sprays did not improve the ability of olive trees to withstand the freezing stress.
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References
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