铝对氟在茶树体内吸收与分配的影响

为了探讨铝(Al3+)对茶树吸收氟(F)的累积特性，研究溶液培养条件下，不同浓度Al3+及c(Al3+):c(F－)比例对茶树吸收富集F的影响。结果表明：低浓度Al3+ (1.05～5.26mmol/L，c(Al3+):c(F－)=1:10～1:2)促进了F在茶树根部的富集，主要以F离子态形式被茶树吸收；而高浓度Al3+ (10.52～31.57mmol/L，c(Al3+):c(F－)=1:1～3:1)抑制了F在茶树根部的富集，主要以Al/F络合态形式被茶树吸收。不同浓度Al3+促进了F在茶树叶部的富集。培养液中c(Al3+):c(F－)≥1时(c(Al3+)≥10.52mmol/L)，抑制了茶树根部对F的吸收富集，而c(Al3+):c(F－)＜1时(c(Al3+)≤5.26mmol/L)，促进了茶树根部对F的吸收富集。Al3+促进了茶树体内F向地上部分转移，尤以c(Al3+):c(F－)为1:1、1:3、1:5时，F从茶树根部向地上部分转移系数最高。

Influence of Aluminum on Absorption and Distribution of Fluoride in Tea Plants(Camellia sinesis L.)

The effects of different Al3+ concentrations and different c(Al3+):c(F－) concentration ratios on accumulation
characteristics of fluoride in tea plants (Camellia sinesis L.) under liquid culture conditions were examined. Low Al3+
concentrations (1.05－5.26 mmol/L; c(Al3+):c(F－) = 1:10－1:2) could promote fluoride accumulation in tea plant roots and
fluoride was absorbed primarily in an ionic form. On the contrary, fluoride accumulation in tea plant roots was inhibited under
high Al3+ concentrations (10.52－31.57 mmol/L; c(Al3+):c(F－) = 1:1－3:1) and fluoride was absorbed primarily in the form of
c(Al3+):c(F－)complex. Different Al3+ concentrations had a promoting effect on fluoride accumulation in tea leaves. Fluoride
accumulation in tea plant roots was inhibited at c(Al3+):c(F－) ratios equal to or greater than 1 and Al3+ concentrations equal to or
greater than 10.52 mmol/L, but promoted at c(Al3+):c(F－) ratios smaller than 1 and Al3+ concentrations equal to or smaller than
5.26 mmol/L. Al3+ could promote fluoride translocation from roots to leaves in tea plants and the maximum translocation factor
was observed at c(Al3+):c(F－) ratios of 1:1, 1:3 and 1:5.