| Changes in the total phenolics, extractable condensed tannins, protein bound condensed tannins, fibre bound condensed tannins, total condensed tannins, protein- precipitating phenolics and protein precipitation capacity were determined at different developmental stages of propagules of Kandelia candel, Bruguiera gymnorrhiza and Rhizophora stylosa in the Jiulong River Estuary, Fujian, China. In addition, seedlings of B. gymnorrhiza and Aegiceras corniculatum were cultured on various saline conditions (0, 5, 10, 15, 20, 25, 30, 35, 40‰) in greenhouse, Tannins and protein precipitation capacity dynamics of second-pair leaves of K. candel and first leavess of A. corniculatum were also studied.1. There was a significant linear correlation between total phenolics for the two different standards for the propagules of K. candel, B. gymnorrhiza and R. stylosa. The results showed that about twice as much total phenolics content when the purified tannins standard was used rather than the tannic acid standard.2. During the different developmental stages of the propagules of K. candel, total phenolics content of flowers was significantly lower than hypocotyles. During the development of hypocotyles, total phenolics content had a decreasing trend but still had the relatively high content at the late stages (mature hypocotyles). Content of protein bound condensed tannins was lower than fibre bound condensed tannins. As propagules development, Pd/Pc ratio increaced.3. During the development of the propagules of B. gymnorrhiza, the content of total phenolics, extractable condensed tannins, protein bound condensed tannins and fibre bound condensed tannins content had a rapid decline for hypocotyles from 2 cm to 3 cm stage. It takes two months for the hypocotyles of B. gymnorrhiza to grow from 0 cm to 4 cm, and from 4 cm to 12 cm, respectively. Condensed tannins bind more strongly to protein than to fibre. Protein-precipitation capacity of flowers and calyxes...
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