Potential effects of storage period, warehouse locations, and methyl jasmonate in long-term stored garlic bulbs

Authors: SELEN AKAN, NURDAN TUNA GÜNEŞ

Abstract: In this study, the effect of methyl jasmonate (MeJA) treatments (10^-3 and 10^-5 M) and two different storage locations such as Ankara and Taşköprü, on some quality parameters, such as weight loss, L* values, soluble solids content, firmness, titratable acidity, total phenolic content, antioxidant capacity, vitamin C and allicin content in garlic bulbs (Allium sativum cv. 'Taşköprü') were investigated during a storage period of six months with three replications (30 bulbs or 120 g cloves). Based on storage periods, storage locations and MeJA treatment effects, the results showed that the storage period significantly affected all parameters except allicin content. MeJA treatments positively affected weight loss, L* values, soluble solids content, total phenolics, and antioxidant capacity. At the end of the storage, the lowest weight loss was determined in 10^-3 M MeJA as 7.8%, the highest L* value was 85.40 (10^-5 M) and soluble solids content was maintained in 10^-5 M MeJA (40.26%). Higher total phenolics and antioxidant capacity were found in 10^-3 M MeJA (24.44 mg 100g^-1) and 10^-5 M MeJA (66.88% I), respectively. Moreover, warehouse location significantly affected L* values, titratable acidity, total phenolics While Ankara location caused the highest L* (86.07), total phenolics (26.12 mg 100g^-1), and delayed increase in titratable acidity (0.89% citric acid) in samples, the highest values in allicin content (31.42 mg kg^-1) was determined in samples stored in the Taşköprü location. Overall, MeJA treatment could be considered as promising treatment for long-term storage of bulbs in commercial warehouses.

Keywords: Allicin, Allium sativum L., antioxidant capacity, methyl jasmonate, postharvest, quality

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