Keywords
physical dormancy
seeds desiccation
embryo plant
drylands
How to Cite
Abstract
Evaluating functional seed traits allows us to identify ecological strategies of plants in different habitats. However, there are few studies in species from arid tropical areas. The objectives in this study were to: a) identify and evaluate morphological seed traits of Caesalpinia glabrata; an endemic species of the dry forests in Ecuador; b) determine water absorption capacity in the seeds; and c) evaluate the percentage and speed of germination of seed. A total of fifteen morphological traits in seeds were evaluated, and different treatments of imbibition and germination were tested. The individual seed size was approximately 9.2 x 6.6 x 4.5 mm, weight of 0.18 g. The seeds were oval, with smooth, thick and impermeable seed coat which induces its physical dormancy. The seeds presented an axillary-inverted yellow embryo, occupying the entire interior of the seeds. The germination was high in the treatments, mainly when the seed coat part was removed, surpassing the 90 % in 10 days. Germination time was significantly different between treatments (P <0.001). Based on the traits evaluated in this study, C. glabrata have high probability of reproductive success over time under temporary aridity conditions, as well as great potential for use in reforestation and ex situ conservation programs.
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