摘要
利用溶液培养的方法,研究不同体积质量分数的硒对镉胁迫下水稻幼苗生长、硒镉吸收、镉转移以及水稻根系镉外渗量的影响.结果表明:溶液中硒处理体积质量分数小于250μg/L时,硒能缓解镉对水稻生长的毒害作用;当溶液中硒处理体积质量分数高于500μg/L时,硒对镉胁迫没有缓解作用;当硒处理体积质量分数高于800μg/L,硒与镉产生协同效应,加重了镉对水稻的毒害作用.随着硒体积质量分数的增加,水稻地上部和根部镉的质量分数显著下降,地上部降幅大于地下部.在硒处理体积质量分数为800μg/L时,地上部和根部的硒质量分数达到最大.硒能降低镉的转移系数,抑制镉从水稻根部向地上部的转移,降低地上部镉的累积量.随着溶液中硒体积质量分数的增加,根系镉外渗量显著减少,溶液中Se体积质量分数大于500μg/L时,镉的外渗量很低.
In a solution culture experiment under cadmium stress, the effects of different concentrations of selenium in the culture solution on rice seedling growth, selenium and cadmium absorption, cadmium transfer and cadmium leakage of rice roots were investigated. The results showed that with a selenium concentration lower than 250 μg/L in the culture solution, selenium alleviated the toxicity of cadmium to rice growth, with a selenium concentration greater than 500 μg/L, it failed to alleviate cadmium stress, and with a selenium concentration greater than 800 μg/L, a synergistic effect occurred between selenium and cadmium, aggravating the toxicity of cadmium to rice. Cadmium content in the shoot and roots of rice plants decreased significantly with increasing selenium concentrations in the culture solution, the extent of decrease being greater in the shoot than in the roots. With a selenium concentration higher than 800 μg/L in the culture solution, selenium content in the shoot and roots reached the maximum. Selenium decreased the translation coefficient of cadmium and inhibited the transport of cadmium from the roots to the shoot of the rice plants, thus decreasing cadmium accumulation in creasing selenium concentration in the culture solution, the leakage of cadmium from rice roots decreased significantly. Very little leakage of cadmium was observed when selenium concentration in solution was more than 500 μg/L.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第9期17-22,共6页
Journal of Southwest University(Natural Science Edition)
基金
国家自然科学基金资助项目(31101610
31372141)
中央高校基本科研业务费专项资金资助项目(XDJK2011C012)
土壤与农业可持续发展国家重点实验室开放基金重点课题资助项目(0812000030
Y052010014)
公益性行业科研专项-最佳养分管理技术研究与应用(201103003)资助项目
关键词
水稻
硒
镉
paddy rice
selenium
cadmium
