Leaf senescence and nitrogen remobilization efficiency in oilseed rape (Brassica napus L.)
| العنوان: | Leaf senescence and nitrogen remobilization efficiency in oilseed rape (Brassica napus L.) |
|---|---|
| المؤلفون: | Philippe Etienne, Jean Christophe Avice |
| 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) |
| المصدر: | Journal of Experimental Botany Journal of Experimental Botany, Oxford University Press (OUP), 2014, 65 (14), pp.3813-3824. ⟨10.1093/jxb/eru177⟩ |
| بيانات النشر: | HAL CCSD, 2014. |
| سنة النشر: | 2014 |
| مصطلحات موضوعية: | 0106 biological sciences, Senescence, proteolysis, Physiology, Nitrogen, leaf senescence, Proteolysis, medicine.medical_treatment, [SDV]Life Sciences [q-bio], Brassica, Plant Science, Oxidative phosphorylation, 7. Clean energy, 01 natural sciences, Models, Biological, 03 medical and health sciences, medicine, N use efficiency, 030304 developmental biology, Plant Proteins, 2. Zero hunger, Abiotic component, 0303 health sciences, Protease, medicine.diagnostic_test, biology, Brassica napus, biology.organism_classification, Cysteine protease, Cell biology, Plant Leaves, Proteasome, [SDE]Environmental Sciences, N remobilization efficiency, N transport, 010606 plant biology & botany |
| الوصف: | International audience; Despite its worldwide economic importance for food (oil, meal) and non-food (green energy and chemistry) uses, oilseed rape has a low nitrogen (N) use efficiency (NUE), mainly due to the low N remobilization efficiency (NRE) observed during the vegetative phase when sequential leaf senescence occurs. Assuming that improvement of NRE is the main lever for NUE optimization, unravelling the cellular mechanisms responsible for the recycling of proteins (the main N source in leaf) during sequential senescence is a prerequisite for identifying the physiological and molecular determinants that are associated with high NRE. The development of a relevant molecular indicator (SAG12/Cab) of leaf senescence progression in combination with a N-15-labelling method were used to decipher the N remobilization associated with sequential senescence and to determine modulation of this process by abiotic factors especially N deficiency. Interestingly, in young leaves, N starvation delayed senescence and induced BnD22, a water-soluble chlorophyll-binding protein that acts against oxidative alterations of chlorophylls and exhibits a protease inhibitor activity. Through its dual function, BnD22 may help to sustain sink growth of stressed plants and contribute to a better utilization of N recycled from senescent leaves, a physiological trait that could improve NUE. Proteomics approaches have revealed that proteolysis involves chloroplastic FtsH protease in the early stages of senescence, aspartic protease during the course of leaf senescence, and the proteasome beta 1 subunit, mitochondria processing protease and SAG12 (cysteine protease) during the later senescence phases. Overall, the results constitute interesting pathways for screening genotypes with high NRE and NUE. |
| اللغة: | English |
| تدمد: | 0022-0957 1460-2431 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a81e507b46cf27cdc6871fe020c8e1d7Test https://hal.inrae.fr/hal-02633666Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....a81e507b46cf27cdc6871fe020c8e1d7 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00220957 14602431 |
|---|