Effect of environment and gibberellins on the early growth and development of the red mangrove, Rhizophora mangle L. |
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| Authors: | S M Smith Y Y Yang Y Kamiya S C Snedaker |
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| Institution: | (1) Tropical Research and Education Center, University of Florida, 18905 SW 280th St., 33031 Homestead, Florida;(2) Department of Botany, University of Georgia, 30605 Athens, Georgia;(3) Plant Hormone Function Team, Institute of Physical and Chemical Research (RIKEN), Hirosawa 2-1, 351-01 Wako-shi, Saitama, Japan;(4) Division of Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, 33149-1098 Miami, Florida, USA |
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| Abstract: | Seedlings of the red mangrove, Rhizophora mangle L., were subjected to a variety of salinity, light, and plant growth regulator treatments to examine the influence of these factors on early development. Stem, leaf, and root growth were significantly enhanced in both low salinity seawater and under reduced intensities of solar radiation. Semi-quantitative analyses of GAs by enzyme-linked immunoabsorbant assays (ELISA) suggest that under these conditions the early 3/13 hydroxylation GA1 biosynthetic pathway is predominant in R. mangle. Concentrations of GA1 and GA19-like substances were highest in propagules exhibiting enhanced development. Attempts to identify the endogenous GAs by GC-MS were unsuccessful, most likely due to undetermined impurities present in mangroves. Exogenous applications of GA3 to R. mangle were moderately successful in alleviating shoot growth inhibitions observed at higher salinities and light levels. The role of gibberellins is discussed in terms of metabolic responses to the external environment and possible impacts upon the distribution of this species. |
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| Keywords: | gibberellins propagules Rhizophora mangle |
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