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Seed dormancy and germination of Ficus lundellii and tropical forest restoration

Garcia, X., Hong, T. D. and Ellis, R. H. (2006) Seed dormancy and germination of Ficus lundellii and tropical forest restoration. Tree Physiology, 26 (1). pp. 81-85. ISSN 0829-318X

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To link to this item DOI: 10.1093/treephys/26.1.81

Abstract/Summary

We investigated seed dormancy and germination in Ficus lundellii Standl. (Moraceae), a native species of Mexico's Los Tuxtlas tropical rain forest. In an 8-h photoperiod at an alternating diurnal (16/8 h) temperature of 20/30 degrees C, germination was essentially complete (96%) within 28 days, whereas in darkness, all seeds remained dormant. Neither potassium nitrate (0.05-0.2%) applied continuously nor gibberellic acid applied either continuously (10-200 ppm) or as a 24 hour pretreatment (2000 ppm) induced germination in the dark. Germination in the light was not reduced by a 24-h hydrochloric acid (0.1-1%) pretreatment, but it was reduced both by a 24-h pretreatment with either H2O2 (0. 1-5 M) or 5% HCl, or by more than 5 days of storage at 40 degrees C (4.5% seed water content). In a study with a 2-dimensional temperature gradient plate, seeds germinated fully and rapidly in the light at a constant temperature of 30 degrees C, and fully but less rapidly in the light at alternating temperatures with low amplitudes (< 12 degrees C) about the optimal constant temperature. The base, optimal and ceiling temperatures for rate of germination were estimated as 13.8, 30.1 and 41.1 degrees C, respectively. In all temperature regimes, light was essential for the germination of F lundellii seeds.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Agriculture, Policy and Development
ID Code:8528
Uncontrolled Keywords:alternating and constant temperature, hemiepiphyte, strangler fig, temperature gradient plate, RAIN-FOREST, STRANGLER FIG, CANOPY, LIGHT, ESTABLISHMENT

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