| 外源磷对镉胁迫下水稻生长及镉累积转运的影响 |
| 摘要点击 1453 全文点击 612 投稿时间：2020-03-04 修订日期：2020-04-16 |
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| 中文关键词 磷 镉 水稻 转运系数 光合色素 |
| 英文关键词 phosphorus (P) cadmium (Cd) rice translocation factor photosynthetic pigment |
| 作者 | 单位 | E-mail | | 霍洋 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | muyiyang1112@163.com | | 仇银燕 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 周航 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | zhouhang4607@163.com | | 胡雨丹 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 邓鹏辉 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 魏宾纭 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 辜娇峰 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | gujiaofeng@163.com | | 刘俊 | 有色金属矿区耕地重金属污染生态阻抗技术研究衡阳市重点实验室, 衡阳 421001 | | | 廖柏寒 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | |
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| 中文摘要 |
| 本研究通过水稻（黄华占）水培试验，在不同镉（Cd）浓度胁迫条件下，施加10.0~45.0 mg ·L-1外源磷（NaH2PO4），研究磷（P）对水稻植株Cd累积与转运的影响.结果表明：①随外源P浓度增加，水稻各部位生物量及光合色素（叶绿素a、叶绿素b和类胡萝卜素）浓度均逐渐升高；②施加外源P使水稻的茎、叶、谷壳和糙米中Cd含量逐渐增加，水培溶液中Cd浓度为0.1 mg ·L-1和0.2 mg ·L-1胁迫下，糙米Cd含量分别增加了2.8%~22.8%和40.9%~61.8%；③施加外源P使水稻植株Cd累积量增加，水培溶液中Cd浓度为0.1 mg ·L-1和0.2 mg ·L-1胁迫下，Cd累积量范围分别从395.1 μg ·株-1和639.6 μg ·株-1增加到542.6 μg ·株-1和1082.0 μg ·株-1；④水稻根系P/Cd质量比随外源P施加量增加而增大，茎、叶、谷壳和糙米P/Cd质量比则呈下降趋势；增加外源P浓度使水稻根到茎（TF根-茎）和茎到叶（TF茎-叶）的Cd转运系数增加.水稻各部位中P和Cd表现出一定的协同作用，外源P促进了根系中Cd向地上部位转运，增加了糙米Cd含量. |
| 英文摘要 |
| In this study, we investigated the effects of exogenous phosphorus on the accumulation and transportation of cadmium in rice plants through a hydroponic experiment. In the experiment, the rice variety was Huanghuazhan, P solution concentrations were 10.0-45.0 mg ·L-1 that was made using NaH2PO4, and Cd solution concentrations were 0.1 mg ·L-1 and 0.2 mg ·L-1. The results showed that: ① the biomass in all parts of rice plants and contents of photosynthetic pigment (chlorophyll a, chlorophyll b, and carotenoid) increased gradually with an increase in exogenous P. ② Content of Cd in rice stems, leaves, husk, and brown rice increased gradually with an increase in the amounts of exogenous P. The content of Cd in brown rice increased by 2.8%-22.8% and 40.9%-61.8% when treated with Cd concentrations of 0.1 mg ·L-1 and 0.2 mg ·L-1 in hydroponic solutions, respectively. ③ Cd accumulation in rice plants was accelerated due to the application of exogenous P. Cd accumulating amounts increased from 395.1 μg ·plant-1 to 542.6 μg ·plant-1 and 639.6 μg ·plant-1 to 1082.0 μg ·plant-1 when treated with Cd concentrations of 0.1 and 0.2 mg ·L-1 in hydroponic solutions, respectively. ④ With an increase in the applied amounts of exogenous P, the P/Cd quality ratio in rice roots increased, while those in rice stems, leaves, husks, and brown rice decreased; meanwhile, the Cd transfer coefficients from root to stem (TFroot-stem) and stem to leaf (TFstem-leaf) increased. This showed that there was a certain synergistic effect between P and Cd in the rice parts. Finally, the application of exogenous P promoted the transfer of Cd from the rice root to other rice tissues, resulting in a synergistic effect on Cd accumulation and transportation in various rice tissues and increased Cd contents in brown rice. |
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