Nitrogen physiology and metabolism of two contrasting Catalpa bungei genotypes in response to limited nitrogen availability

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ID: 332588
2026
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Abstract
To investigate N physiology and metabolism of different Catalpa bungei (C. bungei) genotypes in response to low N availability, saplings of a genotype (Cbu22-03) with high N uptake efficiency and a genotype (CbuGu) with low N uptake efficiency were exposed to 10, 100, or 1000 μM NH4NO3. The greater root biomass and fine-root surface area in Cbu22-03, combined with its higher net influxes of NO3- and NH4+ and upregulated transcript levels of CbuNRT1.1 and CbuAMT1.2, corresponded to the increased NO3- and NH4+ concentrations and total N amounts in roots compared with CbuGu. Accordingly, δ15N in both roots and leaves of Cbu22-03 was lower than that of CbuGu. Low N supply led to decreased net influxes of NO3- and NH4+, and reduced NO3-/NH4+ concentrations of roots and leaves, NR activities, and total N amounts, while inducing the up-regulation of CbuNRT1.1, CbuAMT1.2, and CbuAHA2 transcript levels, which likely enhanced nitrogen use efficiency (NUE) in both genotypes. These data suggest that Cbu22-03 shows greater capacities of N uptake and assimilation than CbuGu under the three N conditions, and both genotypes of C. bungei decreased the processes of N metabolism in response to low N availability.
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Authors Mengyan Zhou, Jing Zhou, Jiangting Wu, Chenlin Jia, Yang Wang, Jia Wei, Chunhui Yang, Guoxuan Xu, Shuaixu Yan, Longsheng Hu, 邓澍荣, Wenjun Ma, Junhui Wang, Zhi‐Bin Luo
Journal Tree physiology
Year 2026
DOI
10.1093/treephys/tpag152
URL
https://doi.org/10.1093/treephys/tpag152
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