Nitrogen Regulates the Grain Yield, Antioxidant Attributes, and Nitrogen Metabolism in Fragrant Rice Grown Under Lead-Co
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ORIGINAL PAPER
Nitrogen Regulates the Grain Yield, Antioxidant Attributes, and Nitrogen Metabolism in Fragrant Rice Grown Under Lead-Contaminated Soil Huoyi Feng 1,2,3 & Yuzhan Li 1 & Yangfan Yan 1 & Xinhang Wei 1 & Yihan Yang 1 & Long Zhang 1 & Lin Ma 1 & Wu Li 2 & Xiangru Tang 1,4 & Zhaowen Mo 1,4 Received: 6 April 2020 / Accepted: 15 June 2020 # Sociedad Chilena de la Ciencia del Suelo 2020
Abstract The aim of this study is to investigate the effect of nitrogen (N) in the regulation of grain yield, growth, and physiology and biochemistry of fragrant rice under lead (Pb) stress. Three fragrant rice cultivars (Daohuaxiang, Basmati, and Yungengyou14) were grown under two N application levels (CK, 0 kg N ha−1, and HN, 200 kg N ha−1) under Pb-contaminated soil. The grain yield, growth, antioxidant attributes, and N metabolism of fragrant rice cultivars were investigated. Results showed that compared with CK, HN treatment increased grain yield in Daohuaxiang, Basmati, and Yungengyou14 by 24.09%, 26.74%, and 23.29%, respectively. Improvement in the effective panicle, grain number per panicle, and 1000-grain weight and agronomic traits under HN treatment was detected. HN treatment decreased the seed setting rate in the three fragrant rice cultivars. In addition, the peroxidase (POD), catalase (CAT), and glutamate synthetase (GOGAT) activity in HN treatment were increased for the three fragrant rice cultivars at both heading stage and maturity as compared to CK. The correlation between the grain yield and the other investigated parameters has also been accessed. Yungengyou14 produced the highest partial factor productivity of N and agronomic use efficiency of N. Those results suggested that N could improve the grain yield resulted from affecting the growth and physiological response of fragrant rice grown under Pb-contaminated soil. Keywords Growth . Lead . Nitrogen . Physiological attributes . Yield
1 Introduction Huoyi Feng, Yuzhan Li, Yangfan Yan and Xinhang Wei contributed equally to this work. * Wu Li [email protected] * Xiangru Tang [email protected] * Zhaowen Mo [email protected] 1
College of Agriculture, South China Agricultural University, Guangzhou 510642, Guangdong, China
2
Crop Research Institute, Guangdong Academy of Agricultural Sciences, Guangdong Provincial Key Laboratory of Crop Genetic Improvement, Guangzhou 510640, Guangdong, China
3
Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
4
Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, P. R. China, Guangzhou 510642, Guangdong, China
Adverse environments such as global warming and pollutions are harmful to the growth of crops (Lesk et al. 2016; Zhao et al. 2016). Among those adverse environments, pollutions such as the heavy metals affect the growth of rice, which ultimately threatens human health (Wani et al. 2018). Therefore, the heavy metal pollutions are now becoming a big challenge for people to produce agricultural products from the contami
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