Quantitative estimation of the contribution of the phloem in cadmium transport to grains in rice plants (Oryza sativa L.)
Quantitative estimation of the contribution of the phloem in cadmium transport to grains in rice plants (Oryza sativa L.)
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DOI：
10.1111/j.1747-0765.2007.00116.x
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发表时间：
2007-02-01
影响因子：
2
通讯作者：
Hayashi, Hiroaki
中科院分区：
文献类型：
--
作者：
Tanaka, Kensuke;Fujimaki, Shu;Hayashi, Hiroaki
估计了韧皮部在镉 (Cd) 转移到水稻 (Oryza sativa L. cv. Kantou) 籽粒中的贡献。我们测量了灌浆期水稻植株最上部节间采集的韧皮部汁液中的镉浓度。用含10μmol·L-1 Cd的营养液处理2天的植物中镉浓度为17.8+/-4.5μmol·L-1。随后，将Cd-109喂入最上部节间的切割端或剑叶表面或根部后，测定Cd-109在籽粒和颖片之间的分配比。结果表明，籽粒中91-100%的Cd是从韧皮部沉积的。据我们所知，这是首次测定韧皮部汁液中镉浓度的测定，也是首次估计韧皮部在镉向稻粒运输中的贡献。
The contribution of the phloem in translocation of cadmium (Cd) to grains of rice plants (Oryza sativa L. cv. Kantou) was estimated. We measured Cd concentrations in phloem sap collected from the uppermost internode of rice plants at the grain-filling stage. Cadmium concentration was 17.8 +/- 4.5 mu mol L-1 in plants treated with a nutrient solution containing 10 mu mol L-1 Cd for 2 days. Subsequently, distribution ratios of Cd-109 between the grains and the glumes were determined after feeding of Cd-109 to the cut ends of the uppermost internodes or onto the surface of the flag leaves or to the roots. The results suggested that 91-100% of the Cd in the grains was deposited from the phloem. To our knowledge, this is the first determination of Cd concentrations in phloem sap transported to grains, and the first estimation of the contribution of the phloem in Cd transport to rice grains.