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- Title
Selective uptake of organic and inorganic nitrogen by Betula platyphylla seedlings from different provenances.
- Authors
Wu, Haibo; Salomón, Roberto Luis; Rodríguez-Calcerrada, Jesús; Liu, Yangxing; Li, Chunxu; Shen, Hailong; Zhang, Peng
- Abstract
Nitrogen (N) is essential in regulating plant growth and biomass allocation. Plant N uptake and assimilation influence species adaptation and distribution, yet intra-specific comparisons across environmental gradients are scarce. In this study, white birch (Betula platyphylla) seedlings from three Chinese provenances spanning a wide latitude and temperature gradient were cultivated with two inorganic (NO3 and NH4) and one organic (glycine) N forms. We evaluated seedling performance and N uptake for each N form, including the seedling's ability to uptake intact glycine using stable isotopes (13C and 15N). Our data show that both organic (glycine) and inorganic (NO3−) fertilization forms significantly promoted seedling growth and increased the concentration of N, potassium (K) and phosphorus (P) in plant tissues. However, NH4+ caused toxicity, evidenced by chlorosis and necrosis in the apex of old leaves, thereby limiting growth. Seedling growth increased with decreasing latitude, while nutrient concentrations in both shoots and roots decreased with decreasing latitude. Counter to traditional mineral nutrition theory, all seedlings took up intact glycine. Our study can help guide nursery fertilization practices and suggests that the climate of origin affects growth but does not substantially change the preferred N source.
- Subjects
BIRCH; SEEDLINGS; PLANT biomass; MINERALS in nutrition; STABLE isotopes
- Publication
New Forests, 2023, Vol 54, Issue 5, p921
- ISSN
0169-4286
- Publication type
Article
- DOI
10.1007/s11056-022-09949-3