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Effects of Nutrients and Acidity on Tannin Production of Casuarina equisetifolia Seedling Branchlets

短枝木麻黄幼苗小枝单宁形成的养分和酸度效应


对养分和pH值对短枝木麻黄幼苗小枝单宁和其他有机物质产生的影响进行研究。结果表明:短枝木麻黄幼苗小枝总酚(TP)、可溶性缩合单宁(ECT)和氮含量,以及ECT ∶N随着氮肥的施加而显著降低,支持碳氮平衡假说和生长分化平衡假说; 施加磷肥对总酚和可溶性缩合单宁含量没有显著影响,随着pH值的升高,总酚含量显著升高,可溶性缩合单宁含量没有显著变化,而淀粉、叶绿素a、叶绿素a/b、类胡萝卜素和氮磷含量显著降低,因而TP ∶N和ECT ∶N水平均显著升高; 总酚和可溶性缩合单宁与营养物质的关系相反,表明不同类型的单宁存在不同的合成途径,但由于总酚和可溶性缩合单宁均与氮含量没有显著的相关性,故不支持蛋白质竞争模型; TP ∶N和ECT ∶N的水平在养分缺乏条件下较高,有利于提高短枝木麻黄的抵御病虫害能力和降低凋落物的分解率,减少养分的损失。

Effects of nutrients and acidity on production of tannin and other organic matters in branchlets of Casuarina equisetifolia seedlings were studied. The results showed that, nitrogen fertilizer application significantly decreased total phenolics, TP, extractable condensed tannins (ECT), nitrogen contents and ECT ∶N ratios. The result lends support to source-sink theory such as the carbon-nitrogen balance (CNB) theory and the growth-differentiation (GDB) theory. Phosphorus fertilizer application had no significant effects on TP and ECT contents. TP contents increased, and ECT contents remained unchanged with the increasing of pH. But starch, chlorophyll a, carotenoid, nutrient contents and chlorophyll a/b ratios decreased significantly. Accordingly, TP ∶N and ECT ∶N ratios significantly increased. The discrepancy of relationship between nutrition with TP or ECT indicated that the biosynthetic route of different tannins were different. In this study, there was no significant correlation between TP and N, or ECT and N, which did not support protein competition model (PCM). TP ∶N and ECT ∶N ratios were higher under nutrient deficiency conditions, which was one of the important nutrient conservation strategy for C. equisetifolia.


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