Changes in cesium distribution in field-grown rice plants throughout the cultivation period
Changes in cesium distribution in field-grown rice plants throughout the cultivation period
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DOI：
10.1007/s11104-021-05189-0
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发表时间：
2021-10
期刊：
影响因子：
4.9
通讯作者：
J. Ishikawa;Shigeto Fujimura;Mari Murai-Hatano;K. Baba;Manami Furuya;Akitoshi Goto;M. Kondo
中科院分区：
文献类型：
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作者：
J. Ishikawa;Shigeto Fujimura;Mari Murai-Hatano;K. Baba;Manami Furuya;Akitoshi Goto;M. Kondo
目的Cs通过根部被植物吸收，然后分配到植物的不同部位。在水稻盆栽试验中，从抽穗期到成熟期，水稻地上部分Cs浓度变化很大。本研究旨在阐明铯在大田水稻植株中的动态分布规律。方法在不同施钾水平下，利用早稻‘哈巴塔基’(高Cs积累量)和日本栽培‘Koshihikari’(低Cs积累量)进行了2年的田间试验。分析了栽培过程中植株各部位Cs、K含量及土壤交换性Cs、K含量的变化。结果不同品种抽穗期各部位Cs、K含量差异不大，成熟期Cs含量变化较大。其中，节间Cs浓度增加幅度最大。CS在节间的大维管束和薄壁组织中积累到相同水平。与Koshihikari相比，Habataki表现出更高的Cs在节间的积累水平和Cs与糙米的分配比。施钾量对Cs分配的影响低于盆栽试验。结论在田间条件下，随着水稻成熟期的成熟，Cs在节间组织中的积累及其在糙米中的分配显著增加。与Koshihikari相比，Habataki的Cs在节间的积累量和在糙米中的分配比例都较高。
PurposeCs is absorbed by plants via the roots and is then distributed to different plant parts. In pot experiments with rice, Cs concentration in the above-ground parts changed dramatically from the heading stage until maturation. The aim of this study was to clarify the dynamics of Cs distribution in field-grown rice plants throughout the cultivation period.MethodsField experiment was conducted usingIndicacultivar ‘Habataki’ (higher Cs accumulation) andJaponicacultivar ‘Koshihikari’ (lower Cs accumulation) under different K application levels for 2 years. Changes in Cs and K concentration in each plant part and exchangeable Cs and K concentrations in soil were analyzed throughout the cultivation. Laser ablation-inductively coupled mass spectrometry was conducted to reveal tissue-specific accumulation of Cs and K in internodes.ResultsCs concentrations in each part were at similar levels in the heading stage irrespective of the cultivars but greatly changed toward the maturation stage. Particularly, Cs concentration in internodes showed the largest increase. Cs accumulated to the same level in the large vascular bundles and parenchyma in the internodes. Habataki displayed a higher accumulation level of Cs in the internodes and distribution ratio of Cs to brown rice than Koshihikari. The effect of K application on Cs distribution was lower than that in the previous pot experiment.ConclusionsCs accumulation in the internode tissues, along with its distribution to brown rice, was greatly increased during ripening period in field conditions. Habataki showed higher Cs accumulation in internode and distribution ratio to brown rice than Koshihikari.