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Liu J, Li J, Deng C, Liu Z, Yin K, Zhang Y, Zhao Z, Zhao R, Zhao N, Zhou X, Chen S. Effect of NaCl on ammonium and nitrate uptake and transport in salt-tolerant and salt-sensitive poplars. Tree Physiol 2024; 44:tpae020. [PMID: 38366380 DOI: 10.1093/treephys/tpae020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 02/03/2024] [Indexed: 02/18/2024]
Abstract
Nitrogen (N) plays an important role in mitigating salt stress in tree species. We investigate the genotypic differences in the uptake of ammonium (NH4+) and nitrate (NO3-) and the importance for salt tolerance in two contrasting poplars, salt-tolerant Populus euphratica Oliv. and salt-sensitive P. simonii × (P. pyramidalis ×Salix matsudana) (P. popularis cv. 35-44, P. popularis). Total N content, growth and photosynthesis were significantly reduced in P. popularis after 7 days of exposure to NaCl (100 mM) supplied with 1 mM NH4+ and 1 mM NO3-, while the salt effects were not pronounced in P. euphratica. The 15NH4+ trace and root flux profiles showed that salt-stressed poplars retained ammonium uptake, which was related to the upregulation of ammonium transporters (AMTs) in roots, as two of the four AMTs tested significantly increased in salt-stressed P. euphratica (i.e., AMT1.2, 2.1) and P. popularis (i.e., AMT1.1, 1.6). It should be noted that P. euphratica differs from salt-sensitive poplar in the maintenance of NO3- under salinity. 15NO3- tracing and root flux profiles showed that P. euphratica maintained nitrate uptake and transport, while the capacity to uptake NO3- was limited in salt-sensitive P. popularis. Salt increased the transcription of nitrate transporters (NRTs), NRT1.1, 1.2, 2.4, 3.1, in P. euphratica, while P. popularis showed a decrease in the transcripts of NRT1.1, 2.4, 3.1 after 7 days of salt stress. Furthermore, salt-stimulated transcription of plasmalemma H+-ATPases (HAs), HA2, HA4 and HA11 contributed to H+-pump activation and NO3- uptake in P. euphratica. However, salt stimulation of HAs was less pronounced in P. popularis, where a decrease in HA2 transcripts was observed in the stressed roots. We conclude that the salinity-decreased transcripts of NRTs and HAs reduced the ability to uptake NO3- in P. popularis, resulting in limited nitrogen supply. In comparison, P. euphratica maintains NH4+ and NO3- supply, mitigating the negative effects of salt stress.
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Affiliation(s)
- Jian Liu
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Jing Li
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Chen Deng
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Zhe Liu
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Kexin Yin
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Ying Zhang
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Ziyan Zhao
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Rui Zhao
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Nan Zhao
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Xiaoyang Zhou
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
| | - Shaoliang Chen
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Qinghua East Road 35, Haidian District, Beijing 100083, P.R. China
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