Comportamento de duas cultivares de feijoeiro em resposta a temperatura e qualidade fisiológica de lotes de sementes

Abstract

Aiming to evaluate the initial growth of bean seedlings, it was done an experiment analyzing the influence of temperature on seed lots of different levels of physiological qualities of two bean varieties (Phaseolus vulgaris L.). The experiment was conducted in climatic chambers in the Didactic and Research Lab of the Departamento de Fitotecnia UFSM where it was used the constant temperatures of 10, 15, 20, 25 and 30ºC, the varieties Valente and Uirapuru and four shares of different physiological qualities, obtained through artificial aging during periods of zero, 12, 24 and 36 hours (41ºC and 100% of air RH). The tests were: germination, first germination count, germination of velocity index, length of hypocotyl and radicle of young plants and dry matter of hypocotyl and radicle. The design used was complete random, with four replications. In the condition of the experiment, variety Uirapuru showed an inferior development compared to Valente in the lowest temperatures for the analyzed variables, while the physiological quality of the seeds interferes in the development of young plants. Low temperatures have affected negatively the germination and elongation of the hypocotyl.