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| Main Authors: | , , , , , , , , , |
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| Format: | Artículo Open Access |
| Published: |
Wiley
2024
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| Subjects: | |
| Online Access: | https://onlinelibrary.wiley.com/doi/10.1111/plb.13621 |
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Table of Contents:
- Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH4+ toxicity Z. Fan M. N. Lali H. Xiong Y. Luo Y. Wang Y. Wang M. Lu J. Wang X. He X. Shi Y. Zhang Plant Biology Abstract 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. 10.1111/plb.13621 http://onlinelibrary.wiley.com/termsAndConditions#vor