GERMINATION OF PROPAGULES IN CONDITION OF PRE-DISPERSION HERBIVORY OF Laguncularia racemosa (L.) C. F. GAERTN. (COMBRETACEAE) UNDER DIFFERENT SALINE CONCENTRATIONS

• DOI: 10.22533/at.ed.8132116111

• Palavras-chave: Mangrove germination, seedling herbivory, salinity stress

• Keywords: mangrove germination, seedling herbivory, salinity stress

• Abstract:

  Laguncularia racemosa (L.) C. F. Gaertn. (Combretaceae) is a halophyte arboreal mangrove species, which grows under the influence of the flooding by tides, on unstable, saline and anoxic soils characteristic of this ecosystem. The phases of germination and seedling establishment are critical stages, especially in the life cycle of the mangrove species, due to the intertidal environmental conditions, herbivory and high salinities that can become stress and imbalance factors mainly in degraded environments. Propagules in a situation of pre-dispersion herbivory of L. racemosa were evaluated regarding their ability to germinate in different salinity concentrations. The concentrations used were 0 (freshwater), 25, 40 (saline control), 50 and 75 ppt (o/oo). Samples were collected in the mangroves of the municipality of Raposa, Maranhão. The assessed variables were: germinability, germination average time, germination sync calculation, germination average speed, germination speed index and germination average speed coefficient. The study showed that the propagules germinative capabilities were similar regardless of the condition in which they were; propagules that underwent lower salinities than those of the place in which they were collected of their matrices showed a high germinability and a high germination speed index. The successful germination of herbivorous propagules of L. racemosa suggests that they can have efficiency in degraded mangroves recovery used together to healthy propagules.

• Número de páginas: 15