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不同浓度Cd胁迫对稻米Cd形成及生理状况的影响研究
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摘要
探明不同浓度Cd胁迫对于稻米安全生产具有重要的科学价值与现实意义。采用水培试验方法,分别添加CK(0μg?L~(-1))、Cd10(10μg?L~(-1))、Cd50(50μg?L~(-1))、Cd200(200μg?L~(-1))、Cd500(500μg?L~(-1))、Cd1000(1000μg?L~(-1))六种不同Cd浓度处理,研究水稻不同浓度Cd胁迫条件下对稻米Cd形成及水稻生理状况的影响。结果表明,在Cd10μg?L~(-1)处理条件下促进水稻生长,株高、根长、伤流液强度、产量均比CK处理高,在50μg?L~(-1)Cd浓度胁迫下对水稻生长有一定抑制,浓度越高,抑制作用越明显。水稻在不同生育期内不同浓度Cd胁迫对水稻不同部位Cd含量影响随着胁迫浓度增大而升高,不同生育期Cd含量表现为成熟期>分蘖期>孕穗期。糙米Cd含量随胁迫浓度增加而增大,分别为0.07mg.kg~(-1)、4.15mg.kg~(-1)、5.07mg.kg~(-1)、6.75 mg.kg~(-1)、8.00 mg.kg~(-1)、14.07 mg.kg~(-1)。就水稻产量而言,Cd10处理相比CK产量增加但不显著,其他胁迫处理产量随Cd浓度增加而降低,各处理间产量有显著差异,结果可为Cd超标稻田的安全生产及阻控提供数据支持和科学指导。
This article was proved that Cd stress of different concentration has important scientific value and practical significance for safe production of rice. The experiment were added to CK(0μg?L~(-1)), Cd10(10μg?L~(-1)), Cd50(50μg?L~(-1)), Cd200(200μg?L~(-1)) Cd500(500μg?L~(-1)), Cd1000(1000μg?L~(-1)) with different Cd concentration.To study the effect of cadmium stress on rice Cd formation and rice physiological condition. The test results show that, in the condition of Cd10 treatment, the growth, plant height, root length, sap flow intensity and yield were all significantly higher than CK treatment.And inhibited the growth of rice under 50μg?L~(-1) Cd concentration.The effect of Cd stress at different growth stages on the content of Cd in different parts of rice was positively correlated with the increase of stress concentration. The Cd content in different growth stages was in the mature stage> tillering stage> booting stage. Six kinds of mature rice Cd content in brown rice were 0.07 mg.kg~(-1), 4.15 mg.kg~(-1), 5.07 mg.kg~(-1), 6.75 mg.kg~(-1), 8 mg.kg~(-1), 14.07 mg.kg~(-1). The yield of Cd10, Cd200, Cd500, Cd1000 decreased significantly, and there were significant differences among the treatments. The results showed that the cadmium content of rice was significantly affected by cadmium stress. The results could provide data support and scientific guidance for safe production and resistance control of Cd over-standard paddy field.
引文
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