Resumo

FLORES, P et al. Ruptura de la dormición y exigencias de luz para la germinación de semillas de Juglans nigra. FAVE. Secc. Cienc. agrar. [online]. 2017, vol.16, n.2, pp.33-46. ISSN 1666-7719.

The aims of this work were to evaluate methods to overcome the dormancy of Juglans nigra seeds, and to determine their light requirements for germination. To overcome dormancy and soften the endocarp, seeds were subjected to treatments of warm stratification (T1), gibberellic acid immersion (T2) and cold-moist stratification (T3). Light requirements for germination were evaluated though alternating light/dark and continuous darkness conditions. Germination percentage (%G), germination speed index (GSI), mean germination time (MGT), % normal seedlings, % non germinated seeds, mean dry weight of seedlings, and light-relative germination index were evaluated. No germination occurred in T1, and in T2 it was irrelevant. T3 presented significant differences in all the variables studied; stratification for 4 months was the best to overcome dormancy. As light is not a determining factor in germination, this species is classified as neutral photoblastic.

Palavras-chave : Juglans nigra; Ruptura dormición; Estratificación; Exigencia luz; Juglans nigra; Overcome dormancy; Stratification; Light requirements.

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