Molybdenum supply increases root system growth of winter wheat by enhancing nitric oxide accumulation and expression of
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Molybdenum supply increases root system growth of winter wheat by enhancing nitric oxide accumulation and expression of NRT genes Muhammad Imran & Xuecheng Sun & Saddam Hussain & Muhammad Shoaib Rana & Muhammad Hamzah Saleem & Muhammad Riaz & Xiangru Tang & Imran Khan & Chengxiao Hu
Received: 29 July 2020 / Accepted: 4 November 2020 # Springer Nature Switzerland AG 2020
Abstract Aims Increasing evidence shows that root system growth is strongly affected by different nitrogen (N) signals and the available N source in the rhizosphere. Molybdenum (Mo), an essential trace element, plays a key role in N assimilation and metabolism. However, Mo efficacy may vary with different N sources. The present experiment was performed to examine the Mo role on root system growth in winter wheat under different N sources. Methods A hydroponic experiment was conducted consisting of two winter wheat cultivars; Mo-efficient
(97003) and Mo-inefficient (97014) under two Mo levels (0 and 1 μM) and three N sources (NO3−, NH4NO3 or NH4+). Results The results showed that Mo supply increased root dry weight and other morphological traits, nitrate reductase (NR) activities, nitric oxide (NO) contents, total N concentration and the expressions of nitrate transporter (NRT) genes under various N sources, however, such effects were in the order of NH4NO3 > NO3− > NH4+, suggesting that Mo fertilizer shows more complementary effects towards NO3− form of N than sole NH4+ in winter wheat.
Responsible Editor: Richard J. Simpson. Supplementary Information The online version contains supplementary material available at https://doi.org/10.1007 /s11104-020-04765-0. M. Imran : X. Tang State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, People’s Republic of China M. Imran : X. Sun : M. S. Rana : I. Khan : C. Hu 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 S. Hussain Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, Punjab 38040, Pakistan
M. H. Saleem College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China M. Riaz Root Biology Center, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, People’s Republic of China C. Hu (*) Micro-element Research Center of Huazhong, Agricultural University, Wuhan 430070, People’s Republic of China e-mail: [email protected]
Plant Soil
Conclusions These findings imply that Mo plays a significant role in increasing the root system growth of wheat through NO production, efficient N uptake and assimilation, and regulation of NRT gene expressions, especially under NH4NO3 nutrition. Keywords Molybdenum . Nitrate transporters . Nitric oxide . Nitrogen sources . Root system growth . Triticum aestivum L. Abb
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