دورية أكاديمية
Modelling the relative contribution of seed nitrogen reserves and external nitrogen uptake during heterotrophic growth in Medicago truncatula
| العنوان: | Modelling the relative contribution of seed nitrogen reserves and external nitrogen uptake during heterotrophic growth in Medicago truncatula |
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| المؤلفون: | S. Brunel-Muguet, B. Mary, C. Dürr |
| المصدر: | Plant and Soil |
| بيانات النشر: | Springer Verlag |
| سنة النشر: | 2014 |
| المجموعة: | Université Angers: Okina (Open Knowledge, INformation, Access) |
| مصطلحات موضوعية: | Absorption, Compartment model, Ecology, Medicago truncatula, nitrogen, Plant Physiology, Plant Sciences, remobilization, Seedling, Soil Science & Conservation |
| الوصف: | Background and aims Heterotrophic growth relies on remobilisation of seed reserves and mineral absorption. We used a compartmental model to investigate the fluxes of N absorption and remobilisation of N reserves in a legume seed with high protein content. Methods Seedling growth was studied during the heterotrophic stage in two genotypes of Medicago truncatula as a function of N supply. N absorption and seed remobilisation fluxes were distinguished in a 15 N labelling experiment. Results Remobilisation of seed N reserves was high during germination, but N uptake started as soon as the radicle protruded. Both sources contributed to high elongation rates of the radicle and hypocotyl. When organ lengths stabilised, there was an efflux of N from the cotyledons and roots indicating that seedling growth was limited by carbohydrate production. No significant differences between genotypes were observed except for early N uptake, which was lower in the genotype with the highest initial seed N content. Conclusions N fluxes were similar to those of other non-legume dicotyledonous species but differed from monocotyledonous species. These results improve our understanding of the effects of mineral fertilisation on crop establishment. The compartmental model is a useful tool to analyse N fluxes patterns within and between diverse species, in relation to seed characteristics and soil N availability. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | http://okina.univ-angers.fr/publications/ua7922Test |
| DOI: | 10.1007/s11104-014-2182-x |
| الإتاحة: | https://doi.org/10.1007/s11104-014-2182-xTest http://okina.univ-angers.fr/publications/ua7922Test |
| رقم الانضمام: | edsbas.CF54DE9B |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/s11104-014-2182-x |
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