Does energy cost constitute the primary cause of ammonium toxicity in plants?

Kong, Lingan; Zhang, Yunxiu; Zhang, Bin; Li, Huawei; Wang, Zongshuai; Si, Jisheng; Fan, Shoujin; Bao, Feng

doi:10.1007/s00425-022-03971-7

Cited by 17 publications

(8 citation statements)

References 110 publications

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“…Among crop species, varieties that are more tolerant to ion toxicity often have lower ion concentrations in shoots or reduced accumulation in shoots (Kong et al . 2022). However, the total N concentration initially increased and then decreased in both citrus leaves and roots with increasing NH 4 + ‐N supply, probably due to the corresponding inhibition of root growth and thus impaired N uptake (Araya et al .…”

Section: Discussionmentioning

confidence: 99%

“…One of the mechanisms that enables plants to tolerate ion toxicity involves maintaining low ion concentrations in shoots, as evidenced by the frequently observed inverse correlation between shoot ion concentration and plant growth (Rossini-Oliva et al 2018;Lyu et al 2023). Among crop species, varieties that are more tolerant to ion toxicity often have lower ion concentrations in shoots or reduced accumulation in shoots (Kong et al 2022). However, the total N concentration initially increased and then decreased in both citrus leaves and + supply inhibited root growth, which might be a protective mechanism to prevent NH 4 + toxicity.…”

Section: + -N Supplementationmentioning

confidence: 99%

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Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH₄⁺ toxicity

Fan,

Lali,

Xiong

et al. 2024

Plant Biol J

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Ammonium nitrogen (NH4+‐N) is essential for fruit tree growth, but the impact of excess NH4+‐N from fertilizer on evergreen citrus trees is unclear. In a climate chamber, 8‐month‐old citrus plants were exposed to five different hydroponic NH4+‐N concentrations (0, 5, 10, 15 and 20 mm) for 1 month to study effects of NH4+‐N on growth characteristics, N uptake, metabolism, antioxidant enzymes and osmotic regulatory substances. Application of 10 mm NH4+‐N adversely affected root plasma membrane integrity, root physiological functions, and plant biomass. MDA, CAT, POD, APX and SOD content were significantly correlated with leaf N metabolic enzyme activity (GOGAT, GDH, GS and NR). GDH was the primary enzyme involved in NH4+‐N assimilation in leaves, while the primary pathway involved in roots was GS‐GOGAT. Under comparatively high NH4+ addition, roots were the main organs involved in NH4+ utilization in citrus seedlings. Our results demonstrated that variations in NH4+ concentration and enzyme activity in various organs are associated with more effective N metabolism in roots than in leaves to prevent NH4+ toxicity in evergreen woody citrus plants. These results provide insight into the N forms used by citrus plants that are important for N fertilizer management.

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Section: Discussionmentioning

confidence: 99%

Section: + -N Supplementationmentioning

confidence: 99%

Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH₄⁺ toxicity

Fan,

Lali,

Xiong

et al. 2024

Plant Biol J

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“…In many plant species, the key components in the GS–GOGAT–GDH route are accumulated significantly and highly activated upon high NH 4 + stress (Bittsanszky et al, 2015; Guan et al, 2016; Liu and von Wiren, 2017). Excessive NH 4 + assimilation can also cause energy depletion and shoot acidity (Hachiya et al, 2021; Kong et al, 2022), which severely restrains plant growth.…”

Section: Alleviating Nh4+ Toxicity Via Nh4+ Assimilation and Compartm...mentioning

confidence: 99%

“…Progresses have been made to reveal the possible mechanisms of NH 4 + toxicity. Rhizosphere acidification, defects in protein glycosylation, futile NH 4 + cycling, reactive oxygen species (ROS) accumulation, cytoplasm acidification, inorganic cation and organic acid depletion, photosystem disruption, and disturbance of hormone signaling are proposed to contribute to NH 4 + toxicity (Britto and Kronzucker, 2002; Li et al, 2014; Liu and von Wiren, 2017; Jia et al, 2020; Kong et al, 2022). In agriculture, NH 4 + toxicity causes the limited choices of N fertilizers and yield reduction.…”

Section: Introductionmentioning

confidence: 99%

The alleviation of ammonium toxicity in plants

Xiao

Fǎng

2023

JIPB

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Nitrogen (N) is an essential macronutrient for plants and profoundly affects crop yields and qualities. Ammonium (NH4+) and nitrate (NO3−) are major inorganic N forms absorbed by plants from the surrounding environments. Intriguingly, NH4+ is usually toxic to plants when it serves as the sole or dominant N source. It is thus important for plants to coordinate the utilization of NH4+ and the alleviation of NH4+ toxicity. To fully decipher the molecular mechanisms underlying how plants minimize NH4+ toxicity may broadly benefit agricultural practice. In the current minireview, we attempt to discuss recent discoveries in the strategies for mitigating NH4+ toxicity in plants, which may provide potential solutions for improving the nitrogen use efficiency (NUE) and stress adaptions in crops.

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“…Widely referred to as ammonium toxicity, many hypotheses have been proposed to explain the mechanism of this toxic phenomenon, including futile transmembrane ammonium cycling, deficiencies in inorganic cations and organic acids, impaired hormonal homeostasis, disordered pH regulation, defects in protein N-glycosylation, redox imbalance/oxidative stress, and the uncoupling of photophosphorylation [5,6]. In addition, recent efforts using A. thaliana and rice have identified some genetic loci that alter ammonium sensitivity [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Time-course analysis of the transcriptome ofArabidopsis thalianaleaves under high-concentration ammonium sulfate treatment

Iwanaga,

Arai,

Nezuo

et al. 2024

Preprint

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Nitrogen is essential for plant growth and is sourced primarily from nitrate and ammonium in the soil. Even though plants can take ammonium up for nutrition, it often results in toxic effects such as growth suppression and chlorosis. To elucidate the mechanism of ammonium toxicity, a time-course analysis of the transcriptome was performed on A. thaliana leaves treated with high concentrations of ammonium sulfate in the presence of sufficient nitrate. The expression of nitrate-inducible genes tended to be downregulated by the treatment. The expression of genes relating to abscisic acid, jasmonic acid (JA), sali-cylic acid (SA), and membrane trafficking was upregulated, whereas that of photosynthesis-, auxin-, and cytokinin-related genes involved in growth and development was down-regulated. The induction of many osmotic stress-responsive genes suggests the involvement of osmotic stress in ammonium toxicity. Furthermore, the upregulation of nitric oxide (NO)-inducible genes and the simultaneous upregulation of genes involved in JA biosynthesis, glutathione metabolism, and SA response suggested the involvement of endogenous NO and protein S-nitrosylation in response to high concentrations of ammonium sulfate. This study provides a novel and comprehensive overview of transcriptional changes occurring in response to high ammonium sulfate concentrations and proposes possible mechanisms of ammonium toxicity that can be explored in future research.

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Does energy cost constitute the primary cause of ammonium toxicity in plants?

Cited by 17 publications

References 110 publications

Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH₄⁺ toxicity

Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH₄⁺ toxicity

The alleviation of ammonium toxicity in plants

Time-course analysis of the transcriptome ofArabidopsis thalianaleaves under high-concentration ammonium sulfate treatment

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Does energy cost constitute the primary cause of ammonium toxicity in plants?

Cited by 17 publications

References 110 publications

Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH4+ toxicity

Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH4+ toxicity

The alleviation of ammonium toxicity in plants

Time-course analysis of the transcriptome ofArabidopsis thalianaleaves under high-concentration ammonium sulfate treatment

Contact Info

Product

Resources

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Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH₄⁺ toxicity

Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH₄⁺ toxicity