| 刘 芳 1
，杨钊楠 1
，杨睿祺 1
，王摸云 1
，姚 焱 1
，张 平 2.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,2019,46(7):73-78 |
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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 AcidSecretion on Thallium Absorption Capacity |
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| DOI：10.16768/j.issn.1004-874X.2019.07.011 |
| 中文关键词: 铊 水稻 根长 根数 有机酸分泌量 草酸 |
| 英文关键词: thallium rice root length root number organic acid secretion oxalate |
| 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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| 中文摘要: |
| 【目的】探究水稻根系形状及有机酸分泌量对不同水稻品种根系对铊吸收的影响。【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 范围内，吸收能力最高品种的吸收量约是最低品种的 2 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】 The study was to explore the the effect of root shape and organic acid secretion on the
absorption of thallium (Tl) in different rice varieties. 【Method】The hydroponic method was used to compare the amount
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 uptake of 18 rice cultivars ranged from 55.29 to 112.01 mg/ kg, and the uptake of the
variety with highest absorption capacity was two times that of the variety with lowest absorption capacity. 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 Tl uptake and root oxalate secretion was - 0.931 (P ＜ 0.01), which showed that root organic acid secretion
effectively inhibited Tl uptake by rice.【Conclusion】Organic acid secretion from rice roots can be used as an indicator of Tl
uptake capacity of rice seedlings. |
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