| 土壤pH值与镉含量对水稻产量和不同器官镉累积的影响 |
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| 引用本文： | 易镇邪,袁珍贵,陈平平,郭莉莉,屠乃美.土壤pH值与镉含量对水稻产量和不同器官镉累积的影响[J].核农学报,2019,33(5):988-998. |
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| 作者姓名： | 易镇邪 袁珍贵 陈平平 郭莉莉 屠乃美 |
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| 作者单位： | 湖南农业大学农学院/南方粮油作物协同创新中心,湖南长沙,410128;湖南农业大学农学院/南方粮油作物协同创新中心,湖南长沙,410128;湖南农业大学农学院/南方粮油作物协同创新中心,湖南长沙,410128;湖南农业大学农学院/南方粮油作物协同创新中心,湖南长沙,410128;湖南农业大学农学院/南方粮油作物协同创新中心,湖南长沙,410128 |
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| 基金项目： | 国家重点研发计划“粮食丰产增效科技创新”重点专项(2018YFD0301005、2017YFD0301500),国家自然科学基金项目(31171494),农业部行业计划项目(201503123-05),湖南省教育厅科研项目(17C0771) |
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| 摘 要： | 为探明水稻产量与镉积累分配对土壤pH值和镉含量的响应,以3个籽粒Cd含量差异明显的晚稻品种(天优华占,TY;星2号,X2;湘晚籼13号,XW)为试验材料,分别于不同pH值稻田研究土壤镉(Cd)含量对水稻产量和不同器官Cd累积的影响,并比较了品种间差异。结果表明,水稻产量因土壤pH值下降而下降,且品种间降幅差异明显,以X2最大(21.72%33.81%),XW最小(3.05%17.71%);添加0.5 mg·kg-1Cd时水稻减产不显著,但添加1.0 mg·kg-1Cd时各品种均显著减产,且其降幅与品种和土壤pH值有关,X2和XW在酸化条件下降幅较大,而TY在正常pH条件下降幅较大。植株(整株)Cd含量存在品种间差异,各品种植株Cd含量均随着土壤Cd浓度的提高与土壤pH值的下降而显著提高,且植株Cd含量峰值因土壤酸化而提前。水稻器官间Cd含量依次表现根>茎>穗>叶,各器官Cd含量均随着土壤Cd浓度提高而显著增大,但增大倍数存在器官间差异;品种间器官Cd含量差异明显,营养器官表现为X2>TY>XW,而稻穗表现为TY>X2>XW。水稻各器官及全株Cd累积量均随着土壤Cd浓度提高和土壤pH值降低而显著增大,成熟期累积量表现为茎>穗>根>叶;品种间Cd累积量差异明显,营养器官和整株Cd累积量表现为X2>XW>TY,而穗Cd累积量表现为TY>X2>XW。Cd分配比例一般以茎为最高,叶最低,土壤酸化使茎、叶所占比例增大,根、穗所占比例降低;品种间Cd分配比例存在一定差异,穗Cd所占比例表现为TY>X2>XW。可见,水稻产量与器官间Cd累积分配规律受到土壤Cd含量和pH值的影响显著,同时也具有明显的品种间差异。本研究为不同水稻品种在不同pH值与Cd含量稻田上的应用提供了理论依据。
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| 关 键 词： | 水稻 土壤pH值 产量 镉积累分配 品种间差异 |
| 收稿时间： | 2017-10-22 |
Effect of pH Value and Cd Content of Soil on Yield and Cd Accumulation in Different Organs of Rice |
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| YI Zhenxie,YUAN Zhengui,CHEN Pingping,GUO Lili,TU Naimei.Effect of pH Value and Cd Content of Soil on Yield and Cd Accumulation in Different Organs of Rice[J].Acta Agriculturae Nucleatae Sinica,2019,33(5):988-998. |
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| Authors: | YI Zhenxie YUAN Zhengui CHEN Pingping GUO Lili TU Naimei |
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| Institution: | South Regional Collaborative Innovation Center for Grain and Oil Crops in China/College of Agronomy,Hunan Agricultural University, Changsha, Hunan 410128 |
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| Abstract: | Effects of Cd content in soil on rice yield and Cd accumulation were investigated in paddy field with different pH with three late rice varieties with different Cd content in grains, Tianyouhuazhan (TY), Xing No.2 (X2) and Xiangwanxian No.13 (XW), as materials, and the differences among varieties were compared to probe the response of rice yield and Cd accumulation and distribution to soil pH and Cd content. The results showed that rice yield was decreased with the reduce of soil pH, while the decreasing range was different among varieties; that of X2 was the biggest, 21.72%33.81%, and that of XW was the smallest, 3.05%17.71%. Decrease of rice yield was not significant when Cd of 0.5 mg·kg-1 was added in soil, while it was significant when Cd 1.0 mg·kg-1 was applied in soil, and the decreasing range was related to variety and soil pH; that of X2 and XW was bigger in acidified paddy field, while that of TY was bigger in paddy field with normal pH value. Varietal difference in Cd content in whole plant existed, and Cd content in whole plant of 3 varieties was significantly increased with the increment of soil Cd content and the decrement of soil pH, and the peak value of Cd content in whole plant appeared ahead in the acidified field. Cd content in organs showed the trend of root>stem>panicle>leaf, and which was significantly increased with the increment of soil Cd content, while the increase multiple was different among organs. Cd content in organs was different among varieties, that in vegetable organs showed the trend of X2>TY>XW, while that in panicle follow the order of TY>X2>XW. Cd accumulation in rice leaves, stems, roots and the whole plant was significantly increased with the increment of soil Cd content and decrement of soil pH, and abided by stem>panicle>root>leaf at maturity. Clear difference in Cd accumulation among varieties existed, Cd accumulation in vegetable organs and whole plant showed the trend of X2>XW>TY, while Cd accumulation in panicle had the trend of TY>X2>XW. As for Cd distribution proportion, the biggest was stems, and the smallest was leaves. Under acidified soil condition, Cd distribution proportion of stems and leaves was increased, while that of roots and panicles was decreased. Cd distribution proportion was different among varieties, and Cd distribution proportion in panicles followed the sequence of TY>X2>XW. Comprehensively, rice yield and Cd accumulation and distribution among organs were significantly affected by soil pH and Cd content, at the same time clear varietal difference also existed. This study provides a theoretical basis for application of different rice varieties in paddy fields with different pH and Cd content. |
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| Keywords: | rice soil pH value yield Cd accumulation and distribution varietal difference |
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