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水稻磷盈亏对镉吸收转运的影响
摘要点击 595  全文点击 109  投稿时间:2021-10-15  修订日期:2021-10-31
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中文关键词      水稻  转运  累积
英文关键词  phosphorus (P)  cadmium (Cd)  rice  translocation  accumulation
作者单位E-mail
谭文韬 中南林业科技大学环境科学与工程学院, 长沙 410004 tanvventao@163.com 
霍洋 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
糙米品质安全控制湖南省工程实验室, 长沙 410004 
zhouhang4607@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  
曾鹏 中南林业科技大学环境科学与工程学院, 长沙 410004
糙米品质安全控制湖南省工程实验室, 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
糙米品质安全控制湖南省工程实验室, 长沙 410004 
 
廖柏寒 中南林业科技大学环境科学与工程学院, 长沙 410004
糙米品质安全控制湖南省工程实验室, 长沙 410004 
 
中文摘要
      磷(P)是作物生长的必需营养元素,Cd污染耕地中P盈亏对水稻Cd吸收转运的影响和效应还不清晰.通过水培试验施加不同水平的P (NaH2PO4),研究Cd胁迫下,缺P (1.5~6.0 mg·L-1,以P元素计,同下)和富P (12.0~48.0 mg·L-1)对水稻Cd吸收、转运和累积的影响.结果表明:① Cd胁迫下,ρ(P)的增加(1.5~48.0 mg·L-1),水稻生物量无明显变化,叶片光合色素(叶绿素a、叶绿素b和类胡萝卜素)的含量先上升后下降,高浓度的P抑制光合色素的合成;②在缺P和富P条件下,随着P浓度的提高,水稻各部位Cd的含量增加,尤其是糙米中Cd含量分别显著增加132.1%和191.2%;③糙米的P/Cd比值在缺P和富P下呈现分段减少规律,同时糙米中Cd含量与P/Cd呈显著(P<0.01)负相关.Cd胁迫下,水稻缺P和富P时提高P浓度均会促进水稻根系对Cd的吸收与转运,提高Cd在地上部位的累积,增加稻米Cd超标的风险.
英文摘要
      Phosphorus (P) is an essential nutrient element for crop growth. The effects of P surplus or deficit on Cd absorption and transport in rice in Cd-polluted farmland is not clear. The effects of P deficiency and P sufficiency on Cd uptake, transport, and accumulation in rice under Cd stress were investigated by applying different levels of phosphorus (NaH2PO4) in a hydroponic experiment. The results showed that:① with the increase in ρ(P) (1.5-48.0 mg·L-1), the biomass in all parts of the rice plants had no obvious change, and the contents of photosynthetic pigment (chlorophyll a, chlorophyll b, and carotenoid) firstly ascended and then descended; high concentrations of P inhibited the synthesis of photosynthetic pigments. ② Under Cd stress, when the P was deficient (1.5-6.0 mg·L-1) or sufficient (12.0-48.0 mg·L-1), the Cd content in different parts of the rice increased with the increase in P addition level, and the maximum increase in Cd content in brown rice was 132.1% and 191.2%, respectively. ③ The P/Cd of brown rice showed a piecewise decreasing rule under P deficiency and P sufficiency, and the Cd content in brown rice was significantly negatively correlated with P/Cd (P<0.01). These results indicated that elevating phosphorus concentration when rice was under both the conditions of P deficiency and P sufficiency could promote the uptake and transport of Cd by rice roots under Cd stress, thus increasing the accumulation of Cd in aboveground parts and the risk of excessive Cd in rice.

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