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。
【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.
作者
刘芳
杨钊楠
杨睿祺
王摸云
姚焱
张平
LIU Fang;YANG Zhaonan;YANG Ruiqi;WANG Moyun;YAO Yan;ZHANG Ping(Guangzhou Key Laboratory for Functional Study on Plant Stress-Resistant Genes/College of Life Science,Guangzhou University,Guangzhou 510006,China;School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,China)
出处
《广东农业科学》
CAS
2019年第7期73-78,共6页
Guangdong Agricultural Sciences
基金
国家自然科学基金（41373118）
广州大学基础创新项目（2017GZJC-M29,2018GDJC-M26)
关键词
铊
水稻
根长
根数
有机酸分泌量
草酸
thallium
rice
root length
root number
organic acid secretion
oxalate
