Abstract
The availability of water for seeds is closely related to their germination, since hydration is a limiting factor for their metabolic processes. Therefore, in tests carried out in laboratory, substrate must be sufficiently moistened, in order to assure both the embryo growth and seedling formation. This research was carried out to evaluate the influence of different quantities of water, in different substrates, for cabbage (Brassica oleracea var. capitata) seeds germination. The seeds, processed with Thiran 0.1%, were obtained in shops located in Jaboticabal, São Paulo State, Brazil. Germination tests were made in germitest rolled paper towel substrates, between and on draft paper, moistened with quantities of water equivalent to 1.0; 1.5; 2.0; 2.5; 3.0; 3.5; and 4.0 times the dry substrate weight. For each treatment, four repetitions of 50 seeds were used. The seeds were kept in a germinator, at an alternate temperature of 20-30ºC, without further addition of water to the substrate. The evaluations were made on the fifth and tenth days after the experiment preparation. The results obtained revealed that the quantities of water ranging from 1.5 to 2.5 times the paper weight were favorable for seeds germination, mainly in the substrate on and between the paper, while water levels above 3.0 times the substrate weight were harmful for cabbage seeds germination in the rolled paper towel substrates and between the paper. Key-Words: Brassica oleracea var. capitata; quantity of water; seed analysis; germination test.
Highlights
The availability of water for seeds is closely related to their germination, since hydration is a limiting factor for their metabolic processes
Os resultados obtidos indicaram que os teores de água, na faixa de 1,5 a 2,5 vezes a massa do papel, foram favoráveis à germinação das sementes, principalmente no substrato sobre e entre papel, enquanto os teores de água acima de 3,0 vezes a massa do substrato foram prejudiciais à germinação das sementes de repolho, nos substratos rolo de papel e entre papel
Este trabalho objetivou avaliar a germinação de sementes de repolho, em função do aumento dos teores de água nos substratos rolo de papel “germitest”, entre e sobre papel “mata borrão”
Summary
The availability of water for seeds is closely related to their germination, since hydration is a limiting factor for their metabolic processes. Foram conduzidos testes de germinação nos substratos rolo de papel “germitest”, entre e sobre papel “mata borrão”, umedecidos com teores de água equivalentes a 1,0; 1,5; 2,0; 2,5; 3,0; 3,5; e 4,0 vezes a massa do substrato seco. Durante a realização do teste de germinação, o substrato deve permanecer suficientemente úmido, a fim de suprir as sementes com a quantidade de água necessária para sua germinação e desenvolvimento inicial das plântulas. Pesquisas desenvolvidas com o intuito de avaliar a influência de diferentes teores de água no substrato são importantes para minimizar as variações nos resultados dos testes de germinação em laboratório. Este trabalho objetivou avaliar a germinação de sementes de repolho, em função do aumento dos teores de água nos substratos rolo de papel “germitest”, entre e sobre papel “mata borrão”
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