White oat is generally cultivated in areas where there is no problem with water deficit, but due to the expansion of the cultivated areas and climate changes, there is a concern to characterize the genotypes response to water stress. The objectives of this work were to study the variability of responses of white oat cultivars, when subjected to different levels of osmotic potentials and to evaluate the genetic dissimilarity between these, with the use of REMAP markers. To study the variability, two experiments with completely randomized design, conducted in growth chambers were performed, where several oat genotypes in different osmotic potentials were evaluated. To evaluate the dissimilarity among the cultivars, REMAP markers were used. The experiments suggested the characteristics shoot (SL) and root (RL) length as the most affected by the stress. The use of the markers indicated that the similarity among the cultivars varies between 0.80 and 0.58. The study points out the cultivars URS 21, URS Corona, URS Fapa Slava as being those with the highest level of tolerance to water stress. Highlighted Conclusions 1. The 0.8 MPa dose allows the discrimination of cultivars by performance against water stress. 2. The cultivars URS 21, URS Corona and URS Fapa Slava show better performance under water stress.
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