Nitrogen availability, local light regime and leaf rank effects on the amount and sources of N allocated within the foliage of young walnut (Juglans nigra x regia) trees
| العنوان: | Nitrogen availability, local light regime and leaf rank effects on the amount and sources of N allocated within the foliage of young walnut (Juglans nigra x regia) trees |
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| المؤلفون: | Sabine Guillaumie, Peter Millard, Ela Frak, Renate Wendler, Xavier Le Roux |
| المساهمون: | Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier (PIAF), Institut National de la Recherche Agronomique (INRA)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Macaulay Institute, Laboratoire d'Ecologie Microbienne - UMR 5557 (LEM), Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Ecole Nationale Vétérinaire de Lyon (ENVL)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | Tree Physiology Tree Physiology, Oxford University Press (OUP): Policy B-Oxford Open Option B, 2006, 26, pp.43-49 Tree Physiology (Oxford Academic) (26), 43-49. (2006) Scopus-Elsevier Tree Physiology, Oxford University Press (OUP): Policy B-Oxford Open Option B, 2006, 26, pp.43-49. ⟨10.1093/treephys/26.1.43⟩ Tree Physiology, 2006, 26, pp.43-49. ⟨10.1093/treephys/26.1.43⟩ |
| بيانات النشر: | HAL CCSD, 2006. |
| سنة النشر: | 2006 |
| مصطلحات موضوعية: | 0106 biological sciences, Canopy, Light, Nitrogen, Physiology, Apical dominance, juglans regia, chemistry.chemical_element, Juglans, Plant Science, Biology, Plant Roots, 01 natural sciences, branch, leaf N, N allocation, N remobilization, N uptake, N-15, shading, shoot, azote 15, NITROGEN UPTAKE, [SDV.SA.SF]Life Sciences [q-bio]/Agricultural sciences/Silviculture, forestry, régime lumineux, Botany, Rank (graph theory), NITROGEN ALLOCATION, branche, azote, Biological Transport, SHADING, 04 agricultural and veterinary sciences, 15. Life on land, biology.organism_classification, noyer, NITROGEN REMOBILIZATION, LEAF NITROGEN, Plant Leaves, Horticulture, BRANCH, chemistry, Shoot, Root uptake, 040103 agronomy & agriculture, SHOOT, 0401 agriculture, forestry, and fisheries, métabolisme azoté, Shading, feuillage, 010606 plant biology & botany |
| الوصف: | Early season leaf growth depends largely on nitrogen (N) provided by remobilization from storage, and many studies have tested the effect of N availability to roots on the amount of N provided for new leaf development by remobilization. Although it is well known that the light regime experienced by a leaf influences the amount of N per unit leaf area (LA), the effect of the local light regime on the amount of N derived either directly from root uptake or from remobilization for early season leaf growth has never been tested at an intra- canopy scale. The objective of this study was to quantify the relative importance of (1) N availability to roots, (2) local light regime experienced by the foliage (at the shoot scale) and (3) leaf rank along the shoot, on the total amount of N allocated to leaves and on the proportions of N provided by remobilization and root uptake. To quantify the importance of N uptake and remobilization as sources of leaf N, potted hybrid walnut trees (Juglans nigra L. x regia L.) were grown outdoors in sand and fed with a labeled ((15)N) nutrient solution. By removing the apical bud, the trees were manipulated to produce only two shoots. The experimental design had two factors: (1) high (HN; 8 mol N m(-3)) and low (LN; 2 mol N m(-3)) N availability; and (2) high (HL; 90% of incident photosynthetically active photon flux (PPF)) and low (LL; 10% of incident PPF) light. Total leaf N per tree was unaffected by either N availability or irradiance. The HN treatment increased the amount of leaf N derived from root uptake at the whole-tree scale (typically around 8 and 2% in the HN and LN treatments, respectively). Nitrogen allocation within foliage of individual trees was controlled by the local light regime, which strongly affected individual leaf characteristics as leaf mass per unit LA and area- based amount of leaf (N(a)). Decreasing the light availability to a branch decreased the amount of N allocated to it, benefiting the less shaded branches. In contrast, shading of the lower branch did not affect the fraction of total leaf N remobilized for either the lower, shaded branch or the upper, unshaded branch. The relevance of these findings for tree growth modeling is discussed. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0829-318X 1758-4469 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e17d204eecf8a5f73d8501a1a8790a3Test https://hal.archives-ouvertes.fr/hal-01189139Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....7e17d204eecf8a5f73d8501a1a8790a3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 0829318X 17584469 |
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