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Li H, Zhu X, Wang J, Wei Y, Nai F, Yu H, Wang X. Unraveling differential characteristics and mechanisms of nitrogen uptake in wheat cultivars with varied nitrogen use efficiency. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 206:108278. [PMID: 38147707 DOI: 10.1016/j.plaphy.2023.108278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 11/26/2023] [Accepted: 12/10/2023] [Indexed: 12/28/2023]
Abstract
Nitrogen uptake is crucial to wheat nitrogen use efficiency (NUE). The study's findings indicate that both high- and low-NUE cultivars exhibited highest nitrogen uptake efficiency (NupE) under 0.2 mM nitrogen. Under 2 mM nitrogen, their NupEs decrease significantly, while uptakes to NO3- were notably higher than that of NH4+. Strikingly, high-NUE cultivars exhibited a significantly higher NH4+ uptake rate than low NUE cultivars, resulting in a marked improvement in their ability to take up nitrogen. The NUEs of the cultivars with 5 mM nitrogen were almost half that of 2 mM nitrogen. NO3- uptake primarily occurred in the mature zone of roots, while NH4+ uptake took place in the root tip meristem and elongation zones. Notably, the NH4+ uptake in root tip meristematic zone of high-NUE cultivar was significantly higher than that of low NUE cultivar. Furthermore, the NO3- uptake of high-NUE cultivar in the root mature zone was significantly higher than that of low-NUE cultivar under 2 mM nitrogen. These findings were consistent with the significantly higher expression levels of TaAMT in root tip and of TaNRT in root mature area of high-NUE cultivar compared to low-NUE cultivar, respectively, enabling efficient absorption of NO3- and NH4+ and transport of NO3- to shoot. The high-NUE cultivars showed elevated expression of amino acid transporters further promoting nitrogen uptake, and conversion of nitrogen into ureides and amino acids further facilitated inorganic nitrogen uptake by roots. The differential findings offer valuable insights into novel variety breeding of high NUE in the future.
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Affiliation(s)
- Huiqiang Li
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, Henan, China; Research and Experiment Station of Nitrogen and Phosphorus Loss in Farmland of the Yellow River Basin in Henan Province, Zhengzhou 450000, China
| | - Xiaobo Zhu
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, Henan, China
| | - Junjun Wang
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, Henan, China
| | - Yihao Wei
- Research and Experiment Station of Nitrogen and Phosphorus Loss in Farmland of the Yellow River Basin in Henan Province, Zhengzhou 450000, China
| | - Furong Nai
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, Henan, China
| | - Haidong Yu
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, Henan, China; Research and Experiment Station of Nitrogen and Phosphorus Loss in Farmland of the Yellow River Basin in Henan Province, Zhengzhou 450000, China.
| | - Xiaochun Wang
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, Henan, China; State Key Laboratory of Wheat and Maize Crop Science in China, Henan Agriculture University, Zhengzhou 450000, China; Research and Experiment Station of Nitrogen and Phosphorus Loss in Farmland of the Yellow River Basin in Henan Province, Zhengzhou 450000, China.
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Chen M, Zhu K, Xie J, Liu J, Tan P, Peng F. Genome-Wide Identification and Expression Analysis of AMT and NRT Gene Family in Pecan (Carya illinoinensis) Seedlings Revealed a Preference for NH4+-N. Int J Mol Sci 2022; 23:ijms232113314. [PMID: 36362101 PMCID: PMC9655437 DOI: 10.3390/ijms232113314] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/23/2022] [Accepted: 10/28/2022] [Indexed: 11/06/2022] Open
Abstract
Nitrogen (N) is a major limiting factor for plant growth and crop production. The use of N fertilizer in forestry production is increasing each year, but the loss is substantial. Mastering the regulatory mechanisms of N uptake and transport is a key way to improve plant nitrogen use efficiency (NUE). However, this has rarely been studied in pecans. In this study, 10 AMT and 69 NRT gene family members were identified and systematically analyzed from the whole pecan genome using a bioinformatics approach, and the expression patterns of AMT and NRT genes and the uptake characteristics of NH4+ and NO3− in pecan were analyzed by aeroponic cultivation at varying NH4+/NO3− ratios (0/0, 0/100,25/75, 50/50, 75/25,100/0 as CK, T1, T2, T3, T4, and T5). The results showed that gene duplication was the main reason for the amplification of the AMT and NRT gene families in pecan, both of which experienced purifying selection. Based on qRT-PCR results, CiAMTs were primarily expressed in roots, and CiNRTs were majorly expressed in leaves, which were consistent with the distribution of pecan NH4+ and NO3− concentrations in the organs. The expression levels of CiAMTs and CiNRTs were mainly significantly upregulated under N deficiency and T4 treatment. Meanwhile, T4 treatment significantly increased the NH4+, NO3−, and NO2− concentrations as well as the Vmax and Km values of NH4+ and NO3− in pecans, and Vmax/Km indicated that pecan seedlings preferred to absorb NH4+. In summary, considering the single N source of T5, we suggested that the NH4+/NO3− ratio of 75:25 was more beneficial to improve the NUE of pecan, thus increasing pecan yield, which provides a theoretical basis for promoting the scale development of pecan and provides a basis for further identification of the functions of AMT and NRT genes in the N uptake and transport process of pecan.
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Affiliation(s)
- Mengyun Chen
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing 210037, China
| | - Kaikai Zhu
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing 210037, China
| | - Junyi Xie
- College of Forestry, Nanjing Forestry University, Nanjing 210037, China
- Department of Ecology, Nanjing Forestry University, Nanjing 210037, China
| | - Junping Liu
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing 210037, China
| | - Pengpeng Tan
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing 210037, China
| | - Fangren Peng
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing 210037, China
- Correspondence: ; Tel.: +86-25-8542-7995
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