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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dc.identifier.uri http://dx.doi.org/10.15488/719
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/743
dc.contributor.author Koeslin-Findeklee, Fabian
dc.contributor.author Horst, Walter Johannes
dc.date.accessioned 2016-11-24T12:51:16Z
dc.date.available 2016-11-24T12:51:16Z
dc.date.issued 2016
dc.identifier.citation 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
dc.description.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. eng
dc.description.sponsorship DFG/FOR/948
dc.description.sponsorship Landwirtschaftskammer Niedersachsen
dc.language.iso eng
dc.publisher Basel : MDPI AG
dc.relation.ispartofseries Agronomy 6 (2016), Nr. 1
dc.rights CC BY-NC-SA 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/4.0/
dc.subject Brassica napus eng
dc.subject Genotypic differences eng
dc.subject Line cultivars eng
dc.subject Nitrogen efficiency eng
dc.subject Nitrogen retranslocation eng
dc.subject Nitrogen uptake eng
dc.subject Nitrogen utilization eng
dc.subject Stay-green eng
dc.subject.ddc 630 | Landwirtschaft, Veterinärmedizin ger
dc.title 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 eng
dc.type article
dc.type Text
dc.relation.issn 2073-4395
dc.relation.doi http://dx.doi.org/10.3390/agronomy6010001
dc.bibliographicCitation.issue 1
dc.bibliographicCitation.volume 6
dc.bibliographicCitation.firstPage 6010001
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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