Tannin Dynamics of Propagules and Leaves of Kandelia candel and Bruguiera gymnorrhiza in the Jiulong River Estuary, Fujian, China |
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Authors: | Y M Lin J W Liu P Xiang P Lin G F Ye L S L da Sternberg |
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Institution: | (1) Department of Biology, School of Life Sciences, Xiamen University, Xiamen, 361005, China;(2) Fujian Academy of Forestry, Fuzhou, 350012, China;(3) Department of Biology, University of Miami, Coral Gables, FL 33124, USA |
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Abstract: | Changes in the total phenolics, condensed tannins (CT), protein-precipitable phenolics content and protein precipitation capacity
were determined on a series of mangrove leaves from two true viviparous mangrove species (Kandelia candel and Bruguiera gymnorrhiza) at various stages of development and decomposition in the Jiulong River Estuary, Fujian, China. Similar measurements were
also done for the propagules at different developmental stages. The results showed that the total phenolics, extractable condensed
tannins, total condensed tannins, protein-precipitable phenolics content and protein precipitation capacity in young leaves
were higher than those in mature and senescent leaves. Tannin dynamics during leaf decomposition varied with species, and
the rapid loss of phenolics observed during decomposition can be ascribed to leaching and degradation. Protein-bound CT and
fibre-bound CT tended to increase with leaf decomposition, with CT binding more strongly to protein than to fibre. Protein-bound
CT was higher than fibre-bound CT with the exception of mature leaves. Total phenolics, extractable CT and protein-precipitable
phenolics contents in flower tissues were relatively lower than those in hypocotyls at different developmental stages. Protein
precipitation capacity fluctuated with the development of propagules. Increases in nitrogen in decaying litter, and declines
in contents of total phenolics and total condensed tannins of detritus support the general conclusion that decomposing mangrove
detritus can be a more palatable heterotrophic substrate than living leaves. |
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Keywords: | Bruguiera gymnorrhiza Kandelia candel Leaves Propagules Protein precipitation capacity Tannins |
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