CAJ | 학술논문

以高积累和低积累Cd的两种水稻幼苗为材料，对非选择性阳离子通道（NSCCs）在Cd吸收转运过程中的作用进行了研究。结果表明，水稻根系和地上部对Cd的吸收均存在高、低亲和两种转运系统，高积累品种幼苗的Cd吸收转运效率明显高于低积累品种；NSCCs在水稻Cd吸收转运过程中发挥了重要作用，对地上部Cd积累量的贡献率大于根系。在Cd浓度为0.1 mg·L-1的处理下，NSCCs对低积累水稻幼苗地上部Cd积累量的贡献率高达93.5%，显著高于对高积累品种的贡献率。环境中的Cd浓度越高， NSCCs的贡献率越低。NSCCs可能是水稻高亲和转运系统的重要组成部分，能将低浓度的Cd有效转运到地上部。
이고적루화저적루Cd적량충수도유묘위재료，대비선택성양리자통도（NSCCs）재Cd흡수전운과정중적작용진행료연구。결과표명，수도근계화지상부대Cd적흡수균존재고、저친화량충전운계통，고적루품충유묘적Cd흡수전운효솔명현고우저적루품충；NSCCs재수도Cd흡수전운과정중발휘료중요작용，대지상부Cd적루량적공헌솔대우근계。재Cd농도위0.1 mg·L-1적처리하，NSCCs대저적루수도유묘지상부Cd적루량적공헌솔고체93.5%，현저고우대고적루품충적공헌솔。배경중적Cd농도월고， NSCCs적공헌솔월저。NSCCs가능시수도고친화전운계통적중요조성부분，능장저농도적Cd유효전운도지상부。
Research has shown that nonselective cation channels(NSCCs)play important roles in the accumulation and transfer of heavy metals in plants. Here seedlings from high and low cadmium(Cd)-accumulating rice varieties were used to study the effects of NSCCs on Cd absorption and accumulation. Experimental results indicated that two types of mechanisms, i.e. low-affinity transport system and high-affinity transport system, were responsible for the Cd uptake in rice root and shoot. The efficiency of Cd absorption and transport in seedlings from the high Cd-accumulating variety was apparently higher than that from low Cd-accumulating one. NSCCs played an important role in Cd absorption and transport in rice seedlings. The contribution rate of NSCCs to Cd accumulation in the rice shoots was greater than that in the roots. This rate was 93.5%for low Cd-accumulating variety at the Cd concentration of 0.1 mg·L-1, which was significantly greater than that of high Cd-accumulating variety. However, NSCCs contributed less to Cd accumulation under higher Cd concentrations. Therefore, NSCCs might be a part of the high-affinity transport system in rice, transporting Cd to the shoots effectively under low Cd concentrations.