Evaluation of biochemical traits of different sugar beet genotypes under drought stress

In order to investigation of physiological respect of water deficit on important traits in fourteen sugar beet genotypes two experiments conducted in form of split plot in based on randomized complete block design with three replicates in 2009 and 2010. This experiment conducted in researches institute breeding and sugar beet production placed in Karaj, Kamal shahr (latitude 35, 59 North and longitude 50, 75 East with 1313 m upper sea level). Irrigation levels in this experiment include two level S1: Normal irrigation (Irrigation time after 80 mm evaporation of pan class A) and S2: Water deficit (Irrigation time after 180 mm evaporation of pan class A) that applied by ways of turning irrigation. In between irrigation treatments in respect of Super oxide dismutase (SOD) activity rate at p < 0.01 as highest enzyme activity rate showed in drought condition (1479.74 mg pr /unit) and lowest its rate in normal irrigation (1334.44 mg pr /unit). In between studied cultivars in respect of enzyme activity rate showed different significant at p < 0.05. Different significant have been at p < 0.01 in between irrigation treatments in respect of enzyme activity rate of Catalaz. Highest enzyme activity obtained in drought stress (118.58 mg pr/unit) and lowest its activity obtained in normal irrigation (98.33 mg pr/unit). In between irrigation treatments showed different significant at p < 0.01 in respect of enzyme activity Glotation peroxidase (GPX). As highest of GPX activity obtained in drought stress (67.95 mg pr/unit) and lowest its activity (55.7 mg pr/unit). Among irrigation treatments in respect of Malondialdehyde (MDA) rate production have been different significant at p < 0.01, as highest MDA produced (72.94 mg pr/nano mole) due to drought and lowest its rate (64.33 mg pr/nano mole) due to normal irrigation. Different significant at p < 0.01 showed in between cultivars in respect to MDA produced. Different cultivars and irrigation treatments have different non- significant in respect to root yield. Highest root yield obtained in SBSIDR-5, SBSIDR-9 and SBSIDR-14 cultivars and lowest its rate obtained in SBSIDR-2 cv.