109Cd uptake and translocation in a soybean plant under different pH conditions
109Cd uptake and translocation in a soybean plant under different pH conditions
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DOI：
10.1007/s10967-005-0711-z
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发表时间：
2005-05-01
影响因子：
1.6
通讯作者：
Nakanishi, TM
中科院分区：
文献类型：
--
作者：
Ohya, T;Iikura, H;Nakanishi, TM
尽管有报道表明植物组织中Cd的积累随着土壤pH值的降低而增加，但植物体内Cd积累的机制尚未阐明。因此，我们使用 Cd-109 示踪剂和成像板 (IP) 研究了根际 pH 条件对大豆植物根部 Cd 积累的影响，大豆根部是 Cd 吸收的大门。研究发现根组织对镉的吸收是一个快速反应，由于吸收Cd的量在大约2小时内达到平台（其时间常数约为20分钟），Cd很容易被转运到根质外体中，而且其动态不依赖于环境pH条件（pH 4.5，6.5）。然而，有人认为在酸性条件下从根部吸收的镉量要高得多。通过IP拍摄的图像分析，研究了Cd在根部的积累和转运。
Though it has been reported that the accumulation of Cd in plant tissue increases with the decrease of the pH in soil, the mechanism of Cd accumulation in plant has not yet been clarified. Therefore, we investigated the effect of rhizosphere pH condition on the Cd accumulation in a soybean plant root, which is a gate for Cd uptake, using Cd-109 tracer and an imaging plate (IP). Cadmium uptake by root tissue was found to be a fast reaction, since the amount of Cd uptake reached the plateau within about 2 hours (its time constant was about 20 minutes), Cd was easily transported into root apoplast, and moreover, its dynamics did not depend on an environmental pH condition (pH 4.5, 6.5). However, it was suggested that the amount of Cd taken up from the root was much higher in acidic conditions. Through image analysis taken by the IP, the accumulation and translocation of Cd were studied in roots.