Resumo

SANCHEZ-RENDON, Jorge Alberto et al. Effect of controlled conditions on the germination of five Morus alba L. varieties. Pastos y Forrajes [online]. 2017, vol.40, n.4, pp. 281-289. ISSN 2078-8452.

The objective of this study was to determine the effect of substrate temperature and light/darkness alternation, on the germination response of fresh seeds (sexually obtained) of five Morus alba L. varieties (cubana, tigreada, universidad, universidad mejorada and yu-62) harvested in Matanzas Cuba, from two different lots. In the essays a completely randomized design was used; the percentage data of final germination and mean germination time were processed through a simple-classification variance analysis (ANOVA), with factorial arrangement of the treatments. The germination was evaluated at fixed temperature (25 ºC) and in four thermoperiods (25/30 ºC, 25/35 ºC, 25/40 ºC and 25/45 ºC), under two conditions (light and darkness). The seeds did not show dormancy; the highest percentages of final germination for all the varieties were reached at 25/35 ºC with light, although high germination percentages were also obtained in total darkness when the seeds were placed at 25/40 ºC. On the other hand, the fixed temperature of 25 ºC caused in all the varieties a thermoinhibition of germination. The high diversity of germination responses in the studied M. alba varieties, in each harvest date, was shown; which indicates that the germination process can occur under different environmental conditions, particularly where there is a wide fluctuation of temperature.

Palavras-chave : light; seeds; temperature.

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