Evaluating of Drought Tolerance in Full Sib Families of Sugar Beet

This study aims to prepare a paternal parent (pollinator) tolerant to drought stress using full sib families in the Karaj region in Motahhari's station of Sugar Beet Research Institute in 2015 in conditions without stress (based on water needs) and drought stress. For this purpose, an experiment in the form of a split-plot design was conducted with 13 full sib families, two drought-tolerant cultivars (IR7) and (stable), and a normal genotype (191) as control cultivars, with the main factor consisting of two levels (irrigation with drought stress and irrigation without stress) and the sub-factor of all sister families and control genotypes implemented in four replications for one year. After emergence, irrigation treatments were used in both instances (at least twice irrigation). At a probability threshold of 1% and 5%, respectively, the results revealed a statistically significant difference between irrigation treatments for root production and gross sugar output. As a result, a stable cultivar has the largest production of these two qualities.Furthemore, in the two modes of regular watering and stress, the mean root output in the examined families revealed a significant difference at the one percent probability level. Drought stress (SI = 0.72) lowered root and sugar yields. Cultivar 3, origin S1-930637, also has the greatest percentage of gross sugar and the highest drought tolerance index.