Nitrogen sources for current-year shoot growth in 50-year-old sessile oak trees: an in situ 15N labeling approach
| العنوان: | Nitrogen sources for current-year shoot growth in 50-year-old sessile oak trees: an in situ 15N labeling approach |
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| المؤلفون: | Bernd Zeller, Pascale Maillard, Dominique Gérant, Rana El Zein, Nathalie Bréda |
| المساهمون: | Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF), Institut National de la Recherche Agronomique (INRA), AIB-ACS 12000109, Conseil Regional de Lorraine, France, French Ministry of Higher Education and Research |
| المصدر: | Tree Physiology Tree Physiology, Oxford University Press (OUP): Policy B-Oxford Open Option B, 2011, 31 (12), pp.1390-1400. ⟨10.1093/treephys/tpr118⟩ |
| بيانات النشر: | Oxford University Press (OUP), 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | 0106 biological sciences, In situ, Nitrogen, SPRING GROWTH, Physiology, Plant Exudates, chemistry.chemical_element, Flowers, Plant Science, Phloem, Biology, 010603 evolutionary biology, 01 natural sciences, Quercus, Soil, NITROGEN PARTITIONING, Botany, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Nitrogen cycle, SHOOT DEVELOPMENT, Analysis of Variance, Nitrates, Nitrogen Isotopes, NUTRIENT UPTAKE, fungi, Water, food and beverages, Soil chemistry, 15. Life on land, REMOBILIZATION, Isotopes of nitrogen, Quaternary Ammonium Compounds, Horticulture, QUERCUS PETRAEA, chemistry, Isotope Labeling, Shoot, Linear Models, France, Plant nutrition, Plant Shoots, 010606 plant biology & botany |
| الوصف: | International audience; We used long-term in situ 15N labeling of the soil to investigate the contribution of the two main nitrogen (N) sources (N uptake versus N reserves) to sun shoot growth from bud burst to full leaf expansion in 50-year-old sessile oaks. Recovery of 15N by growing compartments (leaves, twigs and buds) and presence of 15N in phloem sap were checked weekly. During the first 2 weeks following bud burst, remobilized N contributed ~90% of total N in growing leaves and twigs. Nitrogen uptake from the soil started concomitantly with N remobilization but contributed only slightly to bud burst. However, the fraction of total N due to N uptake increased markedly once bud burst had occurred, reaching 27% in fully expanded leaves and 18% in developed twigs. In phloem sap, the 15N label appeared a few days after the beginning of labeling and increased until the end of bud burst, and then decreased at full leaf expansion in June. Of all the shoot compartments, leaves attracted most of the absorbed N, which accounted for 68% of new N in shoots, whereas twigs and new buds accounted for only 28 and 3%, respectively. New N allocated to leaves increased from unfolding to full expansion as total N concentration in the leaves decreased. Our results underline the crucial role played by stored N in rapid leaf growth and in the sustained growth of oak trees. Any factors that reduce N storage in autumn may therefore impair spring shoot growth. |
| تدمد: | 1758-4469 0829-318X |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bf2427fa0cb781ffcce72c42ccc7ed9Test https://doi.org/10.1093/treephys/tpr118Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....2bf2427fa0cb781ffcce72c42ccc7ed9 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17584469 0829318X |
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