| 刘芳,杨钊楠,杨睿祺,等.水稻根系性状和有机酸分泌对铊吸收能力的影响[J].广东农业科学,2019,(6-7):- |
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水稻根系性状和有机酸分泌对铊吸收能力的影响 |
| Effects of rice root traits and organic acid secretion on Tl absorption capacity |
| 投稿时间：2019-04-04 修订日期：2019-04-04 |
| DOI： |
| 中文关键词: 铊 水稻 根系性状 有机酸分泌量 |
| 英文关键词: Tl rice Root traits Organic acid secretion |
| 基金项目:国家自然科学基金（41373118）；广州大学基础创新项目（2017GZJC-M29，2018GDJC-M26） |
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| 摘要点击次数: 128 |
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| 中文摘要: |
| 【目的】探究影响不同水稻品种根系对铊吸收的因素。【方法】利用水培方法,比较了不同水稻品种间铊吸收量高低,测定了根系长度、根系数量,以及有机酸分泌能力,并分析了铊吸收能力与水稻根系性状和有机酸分泌量的相关性。【结果】18个水稻品种铊吸收量在55.29 ~ 112.01 mg . kg<sup>-1</sup>范围内,吸收能力最高品种的吸收量约是最低品种的两倍,但根系总长度、根数量与18个品种铊吸收量间均无相关性。进一步选出高、中、低吸收量的6个品种测定其根系有机酸分泌量,铊吸收量与根系草酸分泌量相关系数r= -0.931(p<0.01),呈极显著负相关,表明根系有机酸分泌有效抑制了水稻对铊的吸收。【结论】水稻根系有机酸分泌量可作为衡量水稻苗期铊吸收能力的指标。 |
| 英文摘要: |
| [Objective] To explore the factors affecting Tl uptake by roots of different rice varieties. [Method]The hydroponic method was used to compare the absorption of Tl absorption among different rice varieties. The root length, root number and organic acid secretion capacity were determined. The correlations between Tl absorption capacity and rice root traits and organic acid secretion were analyzed. [Result]The results showed that Tl contents in 18 rice cultivars ranged from 55.29 to 112.01 mg . kg<sup>-1</sup>, and t the highest Tl content was about twice than that of the lowest Tl content. However, there was no correlation between root traits (root length and root number) and Tl uptake among 18 cultivars. Six cultivars with high, medium and low uptake were further selected to determine their root organic acid secretion. The correlation coefficient between thallium uptake and root oxalate secretion was - 0.931 (p < 0.01), which showed that root organic acid secretion effectively inhibited thallium uptake by rice. [Conclusion] Therefore, organic acid secretion from rice roots can be used as indicators of thallium uptake capacity of rice seedlings. |
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