Light Restriction Delays Leaf Senescence in Winter Oilseed Rape (Brassica napus L.)
| العنوان: | Light Restriction Delays Leaf Senescence in Winter Oilseed Rape (Brassica napus L.) |
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| المؤلفون: | Sophie Brunel-Muguet, Jean-Christophe Avice, Alain Ourry, Philippe Etienne, Jacques Trouverie, Patrick Beauclair, Marie-Paule Bataillé |
| المساهمون: | Ecophysiologie Végétale, Agronomie et Nutritions (EVA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Recherche Agronomique (INRA), Normandie Université (NU), Institut National de la Recherche Agronomique (INRA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU) |
| المصدر: | Journal of Plant Growth Regulation Journal of Plant Growth Regulation, Springer Verlag, 2013, 32 (3), pp.506-518. ⟨10.1007/s00344-013-9317-9⟩ |
| بيانات النشر: | Springer Science and Business Media LLC, 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | 0106 biological sciences, GROWTH-CYCLE, Nitrogen, [SDV]Life Sciences [q-bio], Brassica, Plant Science, Photosynthesis, SHADE-AVOIDANCE, 01 natural sciences, 7. Clean energy, Leaf senescence, 03 medical and health sciences, CARBON GAIN, Shading, LEAVES, 030304 developmental biology, 2. Zero hunger, ARCHITECTURE, 0303 health sciences, NITROGEN STORAGE, biology, PHOTOSYNTHESIS, Plant physiology, Sowing, 15. Life on land, REMOBILIZATION, biology.organism_classification, IRRADIANCE, SOLUBLE-PROTEIN, Agronomy, Photosynthetically active radiation, [SDE]Environmental Sciences, Shoot, Agronomy and Crop Science, Oilseed rape, 010606 plant biology & botany, Main stem |
| الوصف: | International audience; Oilseed rape (Brassica napus L.) is a crop with a complex aerial architecture that can cause self-shading leading to a vertical light gradient over the foliage. Mutual shading between neighboring plants at a high sowing density also results in an alteration of photosynthetically active radiation (PAR) absorption by lower leaves. The aim of this study was to analyze the impact that light restriction on lower leaves has on shoot architecture, biomass production and allocation, nitrogen (N) fluxes, and progression of sequential senescence. Field-grown plants were collected at the end of the vegetative rest period and grown in hydroponic conditions until pod maturity. A shading treatment corresponding to a 43.4 % reduction of PAR was applied at the early flowering stage. N uptake and fluxes of N allocation and remobilization were determined by supplying (KNO3)-N-15 in the nutrient solution. Photosynthesis and expression of SAG12 and Cab genes (indicators of leaf senescence progression) were also analyzed on different leaf ranks. The results showed that shading enhanced leaf development on the main stem and ramifications to optimize light capture. The expression pattern of the SAG12/Cab molecular indicator suggested a delay in leaf senescence that allowed leaf life span to be extended resulting in a more efficient leaf compound remobilization, with lower N residual contents in fallen leaves under shading. N uptake increased and N remobilization fluxes were enhanced from source organs (leaves and stem) toward sink organs (flowers). Profuse branching and late senescing varieties would be of interest for further selection programs under high sowing densities. |
| تدمد: | 1435-8107 0721-7595 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66c665fa4c61bc78cca5b6942e584fdeTest https://doi.org/10.1007/s00344-013-9317-9Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....66c665fa4c61bc78cca5b6942e584fde |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14358107 07217595 |
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