دوﻣﯿﻦ ﻫﻤﺎﯾﺶ ﻣﻠﯽ زﯾﺴﺖ ﺷﻨﺎﺳﯽ ﺳﻠﻮﻟﯽ و ﻣﻮﻟﮑﻮﻟﯽ
1386 ﺑﻬﻤﻦ10 و9 ،ﮐﺮﻣﺎن
30 THE EFFECTS OF UV-A, UV-B AND UV-C ON FLAVONOID CONCENTRATIONS IN Pepper plants K. Mahdavian1,2* , M. Ghorbanli3, Kh. M. Kalantari4 and A. Baghi zadeh1 1- International center for science, High technology and Environmental science E-MAIL:
[email protected] 2-Biology Department, Payam noor university of Sirjan 3-Azad Islamic university of Gorgan 4-Biology Dept., Faculty of Science, Shahid Bahonar university of Kerman
Abstract Although Ultraviolet radiation is potentially harmful, it is an important component of terrestrial radiation to which plants have been exposed since invading land. Since then, plants have evolved mechanisms to avoid and repair UV radiation damage; it is not surprising that photomorphogenic responses to UV-B and UV-C are often assumed to be adaptations to harmful radiation. Most of the compounds accumulated are directly involved in UV-B and UV-C protection: they are either efficient in filtering excess radiation or in scavenging radicals. In this study Plants were grown for 5 weeks in controlled environment rooms. The plants were grown in vermiculite medium using pots. Before applying the UV treatments, plants were subjected to a based nutrient solution (Hoagland solution) for 5 weeks. After 5 weeks, plants were for 2 weeks under treatment UV-A (320-390 nm), UV-B (312 nm) and UV-C (254 nm) irradiation with a density of 6.1 (Wm-2), 5.8 (Wm-2) and 5.7 (Wm-2 ). Each pot treated with UV in their light period for 27 min per day for 14 days. Data were analyzed using SPSS software, and averages were compared by Duncan test. In each experiment was used 4 replicats. Results showed that the content of under UV-B and UV-C treatments, the contents of chlorophyll a, b and carotenoids of pepper leaves were reduced significantly compared with control and UV-A treated plants. Anthocyanins scavenge harmful reactive oxygen species (ROS), and may provide antioxidative protection within plants cells. In contrast, elevated UV-B and UV-C increased (P
