Characterization of Brazilian black oat genotypes regarding seed dormancy

Abstract

The objective of this work was to characterize 30 black oat genotypes regarding seed dormancy. The experiment was carried out in the 2018 and 2019 seasons in a completely randomized design with three factors, being 30 black oat genotypes, two methods of seed germination analysis (with and without dormancy breaking) and five evaluation periods (0, 30, 60, 90 and 120 days after harvest), distributed in four replicates. In each postharvest period, the variables: normal seedlings, abnormal seedlings, number of dormant seeds and number of dead seeds were analyzed. There was significant interaction between factors during the two years of experimentation. In the 2018 season, the percentage of dormant seeds at period zero ranged from 47 to 3% in the method with overcoming dormancy, 86 to 33% in the method without overcoming dormancy. The genotypes ALPHA 1629 and IAPAR 61- Ibiporã presented highest dormancy. In the 2019 season, the percentage of dormant seeds at period zero ranged from 56 to 3% with overcoming dormancy and 85 to 12% without overcoming dormancy. There is variability of dormancy among genotypes and this is overcome after 60 days of harvest. The IAPAR 61-Ibiporã genotype have highest of dormancy seeds.