TY - JOUR JF - ijppb JO - 3 VL - 1 IS - 2 PY - 2016 Y1 - 2016/3/01 TI - The study of interactive effects of UV-B Radiation and drought stress on some physiological traits of two cultivar of gourd (Cucurbita pepo L.) TT - اثرات متقابل اشعهUV-B و خشکی بر برخی فرآیندهای فیزیولوژیکی دو رقم کدو (Cucurbita pepo L.) N2 - The objective of the present investigation was to study the effect of drought stress, UV-B radiation and the combined effects of UV-B and drought stresses on two cultivars of gourd (mashhadi and hamadani) seedling. the gourd plants were grown with diurnal regime of 16h light and 8h dark and temperature of 22/260C (night/day). The relative humidity was 60% and average of photosynthetically active radiation was 150 µmol.m-2.S for 25 days. Then, 25-days-old seedlings were divided in to four groups: the control and three groups subjected to stress conditions: UV-B radiation and drought stress conditions, UV-B radiation and drought stresses combined. Results showed that shoot and root length, shoot and root dry and fresh weight, leaf total area, leaf RWC, chlorophyll a, b and carotenoid contents which were irradiated either with UV-B, drought stress or combined of two stresses have reduced significantly when compared with control. The physiological parameters indicate that with this experiment situation UV-B stress has stronger stress effectors than drought on the growth of seedling of both cultivars. The results suggested that co-stresses of supplementary UV-B radiation and drought synergistically functioned and one of them could alleviate the inhibitory effects of another under the condition of arid and semiarid loessial soils. SP - 16 EP - 26 AU - Hagihosseinlo, Nobar AU - Hosseini sargein, Siavasg AU - Jamei, Rashid AD - Urmia University KW - Gourd KW - Ultraviolet Radiation KW - Drought stress KW - Photosynthetic pigments KW - RWC UR - http://ijppb.lu.ac.ir/article-1-22-en.html ER -