Abstract

ARAOZ, Susana; DEL LONGO, Olga  and  KARLIN, Ola. Seed germination of Zizyphus Mistol Grisebach. II: Responses to different temperatures and light. Multequina [online]. 2004, vol.13, n.1, pp.45-50. ISSN 1852-7329.

The objective of this work was to determine the effects of different temperatures on the germination process of Zizyphus mistol Grisebach seeds, and if they had a light requirement to germinate. Under controlled conditions the seeds were incubated in trays and placed in germination chambers regulated at constant temperatures of 10º, 15º, 20º, 25º, 30º, 35º, 40º, 45º and alternated temperature of 20º/30 ºC (16/8 h) and conduced under continuous darkness or under daily photoperiod of 8 h light. The evaluated parameters in photoperiod conditions were: the germination velocity or First count (% of normal seedlings at 8 days from incubation) and the germination percentage or Final count (% or normal seedlings at 12 days from incubation). The evaluated parameter in continuous dark conditions was the percentage of germinated seeds ( % of seeds at least with radicule emission at 12 days from incubation). The seeds of this specie showed an optimal range of germination temperatures between constant 25º and 35°C as well as alternant temperatures of 20º/30ºC. The extremes cardinal temperatures were registered at 15º and 40ºC. It was not observed light requirements for germination.

Keywords : Zizyphus mistol; Seeds; Germination; Temperature; Light.

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