Biologia floral de cultivares de Avena strigosa

Abstract

Black oat is a plant of multiple uses in the agricultural system, however breeding programs have little success in getting new genotypes, without knowing the exact reason, so this study had the goal to characterize the floral morphology and to evaluate if there is variability in Avena strigosa in its pollen viability. For that, two cultivars of contrasting habit and cycle (IAPAR 61-Ibipora and UPFA 21-Moreninha) were cultivated in the field and in a vase in the city of Passo Fundo, in the north of the state of Rio Grande do Sul. Morphological evaluations were performed on the panicle, spikelets and pollen grains of the cultivars. In the cv. IAPAR 61- Ibipora were found the largest lengths of spikelet, rachilla, gulms I, gulms II, palea, ridge and pistil. In the cv. UPFA 21-Moreninha there was found greater length of the rachis, lemma and anther in the apical and greater density of spikelets in the panicle. About the pollen viability, the cultivars do not differ from each other, evidencing that only pollen grains measurements were contrasting.