Desempenho fisiológico de sementes de a?aí (Euterpe oleracea Mart.) armazenadas com diferentes teores de água e tratadas com fungicida

摘要

The expansion of a?ai production has increased the importance of management of seeds used for replanting or expanding the plantation areas. Thus, the aim of this work was to evaluate the performance of a?ai seeds with different moisture contents, treated or untreated with fungicide, and stored for 180 days. The seeds were divided into three moisture levels (35%, 30% and 20%), and with or without fungicide treatment, with four storage evaluation periods (0, 60, 120 and 180 days). They were packed in plastic bags and kept in natural environment. The experimental design was completely randomized, with a 3 x 2 x 4 factorial scheme (moisture contents x treated or untreated with fungicide x period of evaluation), with four replications of 50 seeds each. The following tests were conducted: moisture content, germination, tetrazolium test, seedling emergence, seedling emergence speed and X-ray. A?ai seeds with 35% and 30% moisture contents treated with fungicide showed a better physiological quality in relation to the untreated ones. Storage longer than 120 days reduced seed germination to values below 50%, regardless of whether they were treated or not with fungicide, although the reduction was greater in untreated seeds. The fungicide treatment is efficient in controlling fungi in a?ai seeds with 30% and 20% moisture content for up to 180 days of storage, and in seeds with 35% moisture content for up to 60 days of storage.