| Resumo: |
The white oat crop (Avena sativa L.) has become an important player in the winter cropping system in Southern Brazil and is pointed out as the major alternative for wheat farmers in cropping rotation. Lowland soils of Southern Brazil represent an area of about 5.4 million hectares which are almost exclusively cultivated with rice as a summer crop. The development and yield of other species is harmed by low drainage conditions and lack of oxygen in the soil. Therefore, there is a need to provide alternative crops for winter cultivation in these regions, such as oat cultivars with high adaptation to this environment and, at the same time, with ability to maintain a high grain yield potential. Thus, the goal of this work was to investigate the response of oat cultivars from different breeding programs regarding the tolerance and sensitivity to flooding. Morph physiological characters were measured in order to screen genotypes and to select potential parents for crossing blocks. Forty oat genotypes were subjected to different flooding alternated with draining periods on the greenhouse. The experimental design adopted was random blocks, with three replications, where each observation unit consisted of a pot containing three plants. The results indicate the presence of genetic variability for the character flooding tolerance on greenhouse conditions. Under flooding conditions, the genotypes URS20 UPFA23 and UPF15 displayed better performances in the first year of the experiment, de ting that they are more tolerant to stress by flooding. While in the second year the genotypes UFRGS19, UFRGS037382 and ALBASUL obtained the best performance. Showing great sensitivity to stress during the two years of the experiment are the genotypes UPFA20, UFRGS0171 and UPF94H100, these genotypes could be used to form blocks of crosses.These genotypes could be used to form a mapping population and to perform additional genetic studies. |
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