Contribution of nitrogen uptake and retranslocation during reproductive growth to the nitrogen efficiency of winter oilseed-rape cultivars (Brassica napus L.) differing in leaf senescence

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Koeslin-Findeklee, Fabian; Horst, Walter J.: Contribution of nitrogen uptake and retranslocation during reproductive growth to the nitrogen efficiency of winter oilseed-rape cultivars (Brassica napus L.) differing in leaf senescence. In: Agronomy 6 (2016), Nr. 1, 6010001. DOI: http://dx.doi.org/10.3390/agronomy6010001

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Abstract: 
Genotypic variation in N efficiency defined as high grain yield under limited nitrogen (N) supply of winter oilseed-rape line-cultivars has been predominantly attributed to N uptake efficiency (NUPT) through maintained N uptake during reproductive growth related to functional stay-green. For investigating the role of stay-green, N retranslocation and N uptake during the reproductive phase for grain yield formation, two line cultivars differing in N starvation-induced leaf senescence were grown in a field experiment without mineral N (N0) and with 160 kg N·ha−1 (N160). Through frequent harvests from full flowering until maturity N uptake, N utilization and apparent N remobilization from vegetative plant parts to the pods could be calculated. NUPT proved being more important than N utilization efficiency (NUE) for grain yield formation under N-limiting (N0) conditions. For cultivar differences in N efficiency, particularly N uptake during flowering (NUPT) and biomass allocation efficiency (HI) to the grains, were decisive. Both crop traits were related to delayed senescence of the older leaves. Remobilization of N particularly from stems and leaves was more important for pod N accumulation than N uptake after full flowering. Pod walls (high N concentrations) and stems (high biomass) mainly contributed to the crop-residue N at maturity. Decreasing the crop-inherent high N budget surplus of winter oilseed-rape requires increasing the low N remobilization efficiency particularly of pod-wall N to the grains. Addressing this conclusion, multi-year and -location field experiments with an extended range of cultivars including hybrids are desirable.
License of this version: CC BY-NC-SA 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
total perc.
1 image of flag of Germany Germany 94 84.68%
2 image of flag of China China 6 5.41%
3 image of flag of France France 3 2.70%
4 image of flag of United States United States 2 1.80%
5 image of flag of Russian Federation Russian Federation 2 1.80%
6 image of flag of Poland Poland 1 0.90%
7 image of flag of Hong Kong Hong Kong 1 0.90%
8 image of flag of Switzerland Switzerland 1 0.90%
9 image of flag of Bulgaria Bulgaria 1 0.90%

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