Seasonal Variation of Tannin and Nutrient in Aegiceras corniculatum Leaves in Zhangjiang Mangrove Ecosystem

Minshen Huang,Lihua Zhang,Qi Zeng,Yiming Lin,Shudong Wei,Haichao Zhou

doi:10.2174/1874123101509010143

Abstract

Seasonal dynamics of total phenolics (TP), extractable condensed tannins (ECT), protein-bound condensed tannins (PBCT), fiber-bound condensed tannins (FBCT), total condensed tannins (TCT) and nitrogen contents in sun and shade leaves of Aegiceras corniculatum were studied in the Zhangjiang Estuary, Fujian Province, China. The contents of TP, ECT and TCT in the sun leaves were significantly higher than those in the shade leaves through the season. The N content in sun leaves was higher than that in shade leaves in the autumn, while it was lower in the summer, and there was no significant difference in the winter and spring. With the respect to the P through the year, P content in the sun leaves was different between seasons, with the highest in winter and the lowest in summer. In addition, the TP:N and ECT:N ratios in sun leaves were significantly higher than those in shade leaves except in autumn. High tannin levels and TP:N and ECT:N ratios in the sun leaves not only can reduce oxidative stress, but also improve the ability of resisting plant diseases and insect pests.

Highlights

D Tannins, a group of phenolic compounds, are a E significant component of plant secondary metabolites [1].They are the fourth most abundant biochemical substance in vascular plant tissue and could be found in plant leaves,T roots, wood, bark, fruits and buds [2, 3]
Light is one of the most important factors affecting the growth of plants and its intensity played important role in the formation and accumulation of secondary metabolites in plants [16]
Sun leaves had higher contents of total phenolics (TP) (Fig. 1A) and extractable condensed tannins (ECT) (Fig. 2A) than the shade, indicating that the light intensity stimulate the synthesis of tannin in the plant

Summary

Introduction

D Tannins, a group of phenolic compounds, are a E significant component of plant secondary metabolites [1].They are the fourth most abundant biochemical substance in vascular plant tissue and could be found in plant leaves,T roots, wood, bark, fruits and buds [2, 3]. D Tannins, a group of phenolic compounds, are a E significant component of plant secondary metabolites [1]. They are the fourth most abundant biochemical substance in vascular plant tissue and could be found in plant leaves,. C amount of energy, their widespread occurrence indicated the important role in plant function and evolution [4, 5] A been suggested that dominant plant in poor-nutrient ecosystems exhibited advantages over the other species by the production of large amount of tannins and some other. Mangrove was considered to be an important link between

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