غربال ژنوتیپ های چغندرقند از نظر تحمل به خشکی با استفاده از پلی اتیلن گلیکول 6000

The present study was carried out to evaluate the drought tolerance of new sugar beet monogerm hybrids in vitro with stress induced by polyethylene glycol 6000. The experiment was conducted as a factorial experiment based on completely randomized design with four replications in Sugar Beet Seed Institute, Karaj, Iran in 2013. The seeds of 25 sugar beet genotypes (23 new monogerm hybrids and two tolerant and normal controls) were sown in normal (no osmotic stress) and drought stress (-0.7 Mpa) conditions. After six weeks, traits such as length of root and shoot, fresh weight of root and shoot, dry weight of root and shoot, the ratio of shoot to root length and seedling dry and fresh weight were measured. The analysis of variance showed that stress levels, genotypes and their interaction were significant for all traits. According to the results of mean comparison and STI, the hybrids 13, 22, 23, 21, 7, 4, 20 and 3 were found to be the most tolerant hybrids to drought stress. Thus, it can be concluded that the in vitro selection could be effective for initial screening of genotypes for drought tolerance in sugar beet breeding programs.