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Seedlings of Poncirus trifoliata exhibit tissue‐specific detoxification in response to NH4+ toxicity.
- Source :
-
Plant Biology . Apr2024, Vol. 26 Issue 3, p467-475. 9p. - Publication Year :
- 2024
-
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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NITROGEN fertilizers
*SEEDLINGS
*CITRUS
*WOODY plants
*PLANT biomass
*TREE growth
Subjects
Details
- Language :
- English
- ISSN :
- 14358603
- Volume :
- 26
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Plant Biology
- Publication Type :
- Academic Journal
- Accession number :
- 176213965
- Full Text :
- https://doi.org/10.1111/plb.13621