Filocrono de genótipos de aveia branca e preta submetidos a vernalização

Abstract

The main meteorological elements that influence oat plant development are temperature and photoperiod. When exposed to vernalizing temperatures (from 1ºC to 10ºC) these plants can be induced to the reproductive stage. The objective of this work was to determine the vernalization response for some white and black oat genotypes grown in southern Brazil. For this, an experiment was carried out in a factorial experimental design with three white oat genotypes (IPR Esmeralda, Fundacep FAPA 43 e IPR Suprema), three black oat genotypes (IPR Cabocla, IPR 61 – Ibiporã e UPFA Moreninha), and eight levels of vernalization (0, 7, 14, 21, 28, 35, 42, 49 days in vernalization). Seed germination occurred in a growth chamber at 25± 2ºC, 12h photoperiod and 75% air humidity for 48h, and subsequently transferred to another growth chamber at 4 ± 2ºC, 12h photoperiod and humidity. 75% during the vernalization period. On the 2nd day of October the seedlings / plants were transplanted to plastic pots in the field, Haun Stage (HS) evaluated twice a week the plant development in the main stem. To determine the phyllochron, each repetition was subjected to a simple linear regression between HS and accumulated thermal sum, where the phyllochron is expressed by the inverse of angular coefficient. The cultivar Esmeralda presented the highest leaf emission rate, while the cultivar Moreninha presented the slowest leaf emission rate, with phyllochron of 94.73 and 126.15 ºC day, respectively. In this case, the phyllochron showed significant difference between the cultivars, however, the vernalization did not influence the speed of leaf emission in oat plants.