Abstract
Climate change and population increase are two challenges for crop production in the world. Hazelnut (Corylus avellana L.) is considered an important nut regarding its nutritional and economic values. As a fact, the application of supporting materials as foliage sprays on plants will decrease biotic and abiotic stresses. In this study, the effects of salicylic acid (0, 1 mM and 2.5 mM) and kaolin (0, 3% and 6%) sprays were investigated on morphological, physiological, pomological, and biochemical characteristics of hazelnut. The results showed that 1 mM salicylic acid and 6% kaolin had the best effects on nut and kernel weight compared to control. Biochemical parameters such as chlorophyll a, b, a + b, and carotenoid contents showed that salicylic acid and kaolin improved pigment concentration. Proline and antioxidant contents such as phenolic acids, SOD, APX, and CAT enzyme activities increased by these applications. On the other hand, lipid peroxidation, protein content, and H2O2 content were decreased. Based on the tolerance index result, Merveille de Bollwiller cultivar showed the highest tolerance while 'Fertile de Coutard' had the lowest value. Therefore, hazelnut performance may be improved through exogenous application of the signaling (salicylic acid) and particle film (Kaolin) compounds in warmer climates.
Highlights
Nowadays, nuts are more important in the human diet because of their nutritional values[1,2], and hazelnut are among the most popular tree nuts
SA treatments were stimulatory for antioxidant systems like proline, phenolic content, and antioxidant enzyme activities (SOD, APX, CAT) and inhibitory on H2O2, MDA, and electrolyte leakage (EL) under heat stress in pea, strawberry, olive, grape, cotton, and rapeseed[34,35,36]
The knowledge emerging from this study may be useful to reveal hazelnut cultivars for ameliorating the materials in high temperatures
Summary
Nuts are more important in the human diet because of their nutritional values[1,2], and hazelnut are among the most popular tree nuts. New production management practices are needed in these climatic conditions, and new genotypes to overcome[7,8] Strategies such as selecting tolerant cultivars, technical management practices, and the use of exogenous protectants for mitigating heat-induced damages are essential to reduce the impacts of high temperatures on horticultural products. Technical management methods include shading and mist irrigation systems, which minimize intense light and high temperatures These techniques need higher technology and abundant water and might spread some fungi d iseases[9]. This study aimed to protect hazelnut orchards under heat stress conditions, considering the climate change trends in recent years in many parts of the world
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
