Effects of Exogenous Phosphorus on Rice Growth and Cadmium Accumulation and Transportation Under Cadmium Stress

被引：1

作者：

Huo Y. ^{[1
]}

Qiu Y.-Y. ^{[1
]}

Zhou H. ^{[1
,2
]}

Hu Y.-D. ^{[1
]}

Deng P.-H. ^{[1
]}

Wei B.-Y. ^{[1
]}

Gu J.-F. ^{[1
,2
]}

Liu J. ^{[3
]}

Liao B.-H. ^{[1
,2
]}

机构：

[1] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha

[2] Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha

[3] Key Laboratory of Hengyang City on Ecological Impedance Technology of Heavy Metal Pollution in Cultivated Soil of Nonferrous Metal Mining Area, Hengyang

来源：

Huanjing Kexue/Environmental Science | 2020年 / 41卷 / 10期

关键词：

Cadmium (Cd); Phosphorus (P); Photosynthetic pigment; Rice; Translocation factor;

D O I：

10.13227/j.hjkx.202003048

中图分类号：

学科分类号：

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 1 082.0 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. © 2020, Science Press. All right reserved.

引用

页码：4719 / 4725

页数：6

共 30 条

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