| 张曼,张锡洲,李廷轩,余海英,张路,黄富,张翼.镉处理对水稻镉安全材料的镉积累及转移特性的影响[J].农业环境科学学报,2017,36(2):223-229. |
| 镉处理对水稻镉安全材料的镉积累及转移特性的影响 |
| Cd accumulations and transfer characteristics of Cd pollution-safe rice materials under different Cd treatments |
| 投稿时间：2016-08-12 |
| DOI：10.11654/jaes.2016-1047 |
| 中文关键词: 水稻 Cd安全材料 积累 转移 |
| 英文关键词: rice Cd pollution-safe materials accumulation transfer |
| 基金项目:四川省科技支撑计划（2014NZ0008）；四川省教育厅项目（14ZB0017） |
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| 中文摘要: |
| 采用土培试验，以前期筛选出的水稻Cd安全材料D62B为试验材料，普通材料Luhui17为对照材料，研究水稻Cd安全材料对Cd的转移特性以及不同叶位对Cd的积累差异。结果表明：在不同Cd处理浓度下，D62B生长受到了一定程度的抑制，且各器官生物量均随Cd处理浓度的增加而显著降低。在分蘖期、抽穗期和成熟期，当Cd处理浓度为8 mg·kg-1时，D62B生物量分别较1 mg·kg-1 Cd处理降低了43.74%、45.72%和40.24%。D62B地上部各器官Cd含量在不同生育期均显著低于Luhui17，且成熟期穗部Cd含量仅为Luhui17的44.52%~54.59%；D62B根系对Cd的滞留率在不同生育期均大于Luhui17，茎叶-穗的转移系数显著低于Luhui17。抽穗期，D62B上部3片功能叶（简称3片功能叶）的Cd含量在不同Cd处理下均显著低于普通材料Luhui17，其积累量则在4 mg·kg-1和8 mg·kg-1 Cd处理浓度下显著低于Luhui17，分别为Luhui17的72.10%和78.00%，且倒2叶Cd积累量差异最大。据此认为，D62B根系对Cd较强的固持作用以及抽穗期3片功能叶低Cd积累量是其籽粒Cd含量较低的主要因素之一，这为后期水稻Cd低积累品种的培育及推广应用提供理论依据。 |
| 英文摘要: |
| A pot experiment was carried out to study the Cd translocation characteristics and Cd accumulation characteristics in different leaf parts of the Cd-Safe Rice Cultivars(D62B) with the control of a common rice cultivar(Luhui17). The biomass of different tissues of D62B significantly decreased with the increasing Cd concentrations in soils. Compared with the treatment of 1 mg·kg-1 Cd, the biomass of D62B decreased by 43.74%, 45.72% and 40.24% when exposed to 8 mg·kg-1 Cd. Cd concentrations in tissues of the aboveground part of D62B were significantly lower than those of Luhui17 during different growth stages. At the mature stage, Cd concentrations in panicle of D62B were only 44.52%~54.59% of those of Luhui17. The retention rate in roots of D62B were significantly higher than those of Luhui17, and the translation coefficients of D62B were significantly lower than those of Luhui17. Besides, at the heading stage, Cd concentrations in the three upper leaves of D62B, referred to as the three functional leaves, were significantly lower than those of Luhui17. Cd accumulations in the three functional leaves of D62B were 72.10% and 78.00% of those of Luhui17 with the treatment of 4 mg·kg-1 Cd and 8 mg·kg-1 Cd. These results indicated that the great accumulation ability in root and low accumulation in the three functional leaves contributed much to the rice safety when exposed to Cd. Furthermore, these results would provide theoretical basis for the cultivation and application of low Cd accumulation cultivars. |
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