Molybdenum Application Regulates Oxidative Stress Tolerance in Winter Wheat Under Different Nitrogen Sources
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ORIGINAL PAPER
Molybdenum Application Regulates Oxidative Stress Tolerance in Winter Wheat Under Different Nitrogen Sources Muhammad Imran 1,2 & Xuecheng Sun 1 & Saddam Hussain 3 & Usman Ali 4 & Muhammad Shoaib Rana 1 & Fahd Rasul 3 & Shadab Shaukat 5 & Chengxiao Hu 1 Received: 6 February 2020 / Accepted: 17 April 2020 # Sociedad Chilena de la Ciencia del Suelo 2020
Abstract Molybdenum (Mo), an essential microelement, may enhance the oxidative stress tolerance in plants. However, the efficacy of Mo might be variable with different forms of nitrogen (N) fertilizer. The present study was conducted to investigate the role of Mo application in regulating oxidative stress tolerance in winter wheat under different N sources. A hydroponic study was carried out comprising of two winter wheat cultivars ‘97003’ and ‘97014’ as Mo efficient and Mo inefficient, respectively, under two Mo levels (0 and 1 μM) and three different N sources (NO3, NH4NO3, or NH4+). Winter wheat plants supplied with different N sources accumulated superoxide anions (O2−), and malonaldehyde (MDA) contents in the order of NH4+ > NO3 > NH4NO3, suggesting that sole application of either N sources, especially sole NH4+ source, may induce oxidative stress in winter wheat. However, Mo application decreased the MDA contents by 20.02%, 15.11%, and 25.89% in Mo-efficient cultivar and 30.75%, 23.79%, and 37.76% in Mo-inefficient cultivar under NO3, NH4NO3, and NH4+ sources, respectively, while increased antioxidant enzyme activities and carotenoids and abscisic acid (ABA) contents up-regulated the expressions of TaAO and TaAba3 genes. Mo application regulated oxidative stress tolerance in winter wheat under different N sources through enhancing ABA production and ROS-scavenging enzymes. Mo-efficient ‘97003’ winter wheat cultivar possesses a wider range of adaptability to withstand Mo-deficient conditions than Mo-inefficient ‘97014’ cultivar. Keywords Abscisic acid . Molybdenum . Nitrogen sources . Reactive oxygen species . Wheat
1 Introduction Nitrogen (N) is available and absorbed in different forms from soil colloids, especially inorganic ions as nitrate (NO3−) and * Chengxiao Hu [email protected] 1
Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China
2
Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou 510642, Guangdong, People’s Republic of China
3
Department of Agronomy, University of Agriculture Faisalabad, Sargodha, Punjab 38040, Pakistan
4
College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
5
Department of Plant Breeding and Genetics, College of Agriculture, University of Sargodha, Sargodha, Punjab, Pakistan
ammonium (NH4+). Most of the growth and developmental processes in higher plants have long been known to benefit from NO3− fertilizers (Marschner 2012; Coruzzi and Bush 2001). N
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