| .不同生育期水稻根表铁膜的形成及其对水稻吸收和转运Cd的影响[J].农业环境科学学报,2013,32(3):. |
| 不同生育期水稻根表铁膜的形成及其对水稻吸收和转运Cd的影响 |
| Formation of Iron Plaque on Root Surface and Its Effect on Cd Uptake and Translocation by Rice（Oryza sativa L.） at Different Growth Stages |
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| DOI：10.11654/jaes.2013.03.004 |
| 中文关键词: 水稻 生育期 Cd 根表铁膜 土壤 |
| 英文关键词: rice growth stage Cd iron plaque soil |
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| 中文摘要: |
| 采用盆栽试验，研究不同生育期水稻根表铁膜的形成及其对水稻吸收和转运Cd的影响。结果表明，水稻根表铁膜的形成受到不同品种和不同生育期影响。随着生育期的延长，两种水稻（YD6和NK57）根表铁膜形成量均呈下降趋势。与分蘖期相比，YD6和NK57根表铁膜量孕穗期分别减少82.9%和44.4%，成熟期分别减少85.2%和82.52%。两种水稻根系和茎叶Cd含量随着水稻生育期的延长而增加。YD6籽粒Cd含量显著高于NK57。Cd在水稻植株的富集系数和分配比率随着不同品种和生育期产生较大变化。YD6品种从根表铁膜和根系向籽粒转运Cd的能力显著大于NK57。水稻成熟期，根表铁膜量与茎叶和籽粒Cd含量呈极显著的负相关（P<0.01），说明根表铁膜形成可抑制Cd向水稻地上部转运。研究结果暗示可通过不同生育期的管理调节水稻根表铁膜的形成，减少Cd向稻谷中转运，从而降低Cd对人体健康的危害。 |
| 英文摘要: |
| Formation of iron plaque on root surface and its effect on Cd uptake and translocation by rice at different growth stages were investigated in pot experiment. The results showed that the formation of iron plaque on root surface was affected by different rice cultivars and growth stages, the amount of iron plaque of two rice cultivars（YD6 and NK57） decreased with the increase of growing stages. Compared to tillering stage, the amount of iron plaque for YD6 and NK57 decreased 82.9% and 44.4% at booting stage，and 85.2% and 82.5.2% at maturing stage, respectively. Both Cd concentration in root and shoot of the two rice cultivars increased with the increase of growing stages. Cd concentration in grain of YD6 was significant higher than that of NK57. Bio-accumulation factor and distribution ratio of Cd varied with different rice cultivars and growing stages. The capacity of Cd translocation from iron plaque and root to grain for YD6 was significant greater than that for NK57. At maturing stage, there was a significant negative correlation between the amount of iron plaque and Cd concentration in shoot or in grain（P<0.01）, indicating that the formation of iron plaque could inhibit Cd transferring from root to shoot and grain. The results implied that Cd transfer to rice grain could be reduced by regulating the formation of iron plaque at different growing stages, and Cd damage to human health would be mitigated. |
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