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作 者 ：万泉

期 刊 ：林业科学 2007年 43卷 11期 页码：21-26

关键词：龙眼；铝胁迫；根区分泌物；

Keywords:Longan (Dimocarpus longana), aluminum stress, root exudation,

摘 要 ：

龙眼幼苗铝胁迫试验表明:铝胁迫导致龙眼幼苗根区分泌物含量发生变化,根系细胞膜透性增加,细胞质成分外渗加重,与对照相比较,根区分泌物中K⁺、Ca²⁺、Mg²⁺的渗漏量、可溶性糖、柠檬酸、苹果酸、草酸均有所增加,增加幅度随铝胁迫浓度的提高而提高。单株K+渗漏增加13.7%～94.9%,Ca²⁺渗漏增加26.9%～2088.5%,Mg²⁺渗漏增加89.5%～871.1%,电导率增加14.6%～109.9%;可溶性糖增加了25.9%～855.6%,还原糖增加了27.8%～847.9%,蔗糖增加了29.2%～921.9%;柠檬酸分泌量增加了21.4%～200.0%,苹果酸分泌量增加了14.3%～142.9%,草酸分泌量增加了4.9%～97.6%;氨基酸量和种类在低浓度铝胁迫(数量在≤0.185mmol·L^-1铝处理时、种类在≤0.074mmol·L^-1铝处理时)时增加,随铝胁迫浓度的增大,根系分泌的氨基酸数量和种类都减少。

Abstract:

Effect of aluminum stress on longan (Dimocarpus longana) seedlings was studied. The results showed that aluminum stress induced the change of root exudation content of longan. The membrane permeability and leakage of longan root increased. Compared with control,the concentrations of K⁺,Ca²⁺ ,Mg²⁺ ,soluble sugar,reduced sugars,sucrose,citric acid,malic acid,and oxalic acid,and electricity conductance in the root exudation increased by 13.7%～94.9%,26.9%～ 2 088.5% ,89.5%～871.1%,25.9%～855.6%,27.8%～847.9%,29.2%～921.9%,21.4%～200.0%,14.3%～142.9%,4.9%～97.6%,14.6%～109.9%,respectively. The quantity and kind of amino acid increased at the low concentration of aluminum (≤0.185 mmol·L^-1 for the quantity,≤0.074 mmol·L^-1 for the kind). However,the quantity and kind of amino acid decreased when the concentration of aluminum increased further.

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