Effects of cultivars, water regimes, and growth stages on cadmium accumulation in rice with different radial oxygen loss
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REGULAR ARTICLE
Effects of cultivars, water regimes, and growth stages on cadmium accumulation in rice with different radial oxygen loss Xiuqin Mei & Qusheng Li & Hailong Wang & Hao Fang & Huijun Chen & Xin Chen & Yaoshuai Yang & Muhammad Rizwan & Zhihong Ye Received: 11 January 2020 / Accepted: 6 July 2020 # Springer Nature Switzerland AG 2020
X. Mei : Z. Ye (*) School of Life Sciences, Sun Yat-sen University, University Town, Panyu, Guangzhou 510006, People’s Republic of China e-mail: [email protected]
Methods Two groups of experiments were conducted: pot trials with soil-added Cd and solution-added agar using 20 rice cultivars and a rhizobag trial with Cdcontaminated soil and pot trial with solution-added agar under flooded and non-flooded water regimes with three growth stages and two cultivars. Results Different rice cultivars exhibited different porosity, Cd tolerance, and Cd accumulation in grains, which were significantly correlated with ROL. Cd concentration in shoots was significantly lower under the flooded (0.13–1.01, mean 0.56 mg kg−1) than nonflooded regime (0.68–1.39, mean 0.97 mg kg−1). The low Cd-accumulating cultivar showed higher rates of ROL, higher Cd combined with Fe plaque formation, and lower Cd bioavailability in the rhizosphere soil than the high-Cd accumulating cultivar. Conclusions Rice cultivars grown under flooded regimes effectively reduced Cd accumulation in edible parts, and the later stage was crucial for reducing Cd accumulation. Low Cd-accumulating cultivars generally exhibited a higher ability to reduce Cd bioavailability in the rhizosphere soil.
Q. Li : H. Fang : H. Chen : Y. Yang School of Environment, Jinan University, Guangzhou 510632, People’s Republic of China
Keywords Radial oxygen loss . Water regime . Cadmium . Rhizosphere . Rice (Oryza sativa L.)
Abstract Background and aims Large areas of paddy fields have been contaminated by cadmium (Cd) in both China and worldwide, resulting in excessive Cd accumulation in rice grains. Here, we investigated the effects of cultivars, water regimes, and growth stages on Cd accumulation in rice with different radial oxygen loss (ROL).
Responsible Editor: Antony Van der Ent. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04634-w) contains supplementary material, which is available to authorized users. X. Mei : H. Wang : X. Chen School of Environmental and Chemical Engineering, Foshan University, Chancheng, Foshan, Guangdong 528000, People’s Republic of China
H. Wang Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, HangzhouZhejiang 311300, People’s Republic of China M. Rizwan Department of Environmental Sciences and Engineering, Government College University, Faisalabad 38000, Pakistan
Introduction Cadmium (Cd) is a hazardous heavy metal and chronic carcinogen, which poses considerable risks to human health (Mehmood et al. 2019; Xue et al. 2017; Yang
Plant Soil
et al. 2018). In China, large areas of agricultural
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