Decrease in percentage content of beta-asarone after sUV-B exposure is a significant finding of the present study in view of its role in possible risks for human health. sUV-B-induced increases of carvacrol, caryophyllene oxide and aristolene contents are also important because of their role in higher antioxidant activity and other important biological properties. sUV-B exposure leads to the higher accumulation of total phenol content in
A. calamus, thus providing protection against UV-B stress. However, further investigations are required to establish dose-dependent changes in yield of essential oil and its chemical profile.