Differences between winter oilseed rape (Brassica napus L.) cultivars in nitrogen starvation-induced leaf senescence are governed by leaf-inherent rather than root-derived signals

Show simple item record

dc.identifier.uri http://dx.doi.org/10.15488/4994
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/5038
dc.contributor.author Koeslin-Findeklee, Fabian
dc.contributor.author Becker, Martin A.
dc.contributor.author van der Graaff, Eric
dc.contributor.author Roitsch, Thomas
dc.contributor.author Horst, Walter J.
dc.date.accessioned 2019-06-26T06:32:26Z
dc.date.available 2019-06-26T06:32:26Z
dc.date.issued 2015
dc.identifier.citation Koeslin-Findeklee, Fabian; Becker, Martin A.; van der Graaff, Eric; Roitsch, Thomas; Horst, Walter J.: Differences between winter oilseed rape (Brassica napus L.) cultivars in nitrogen starvation-induced leaf senescence are governed by leaf-inherent rather than root-derived signals. In: Journal of Experimental Botany 66 (2015), Nr. 13, S. 3669-3681. DOI: https://doi.org/10.1093/jxb/erv170
dc.description.abstract Nitrogen (N) efficiency of winter oilseed rape (Brassica napus L.) line-cultivars (cvs.), defined as high grain yield under N limitation, has been primarily attributed to maintained N uptake during reproductive growth (N uptake efficiency) in combination with delayed senescence of the older leaves accompanied with maintained photosynthetic capacity (functional stay-green). However, it is not clear whether genotypic variation in N starvation-induced leaf senescence is due to leaf-inherent factors and/or governed by root-mediated signals. Therefore, the N-efficient and stay-green cvs. NPZ-1 and Apex were reciprocally grafted with the N-inefficient and early-senescing cvs. NPZ-2 and Capitol, respectively and grown in hydroponics. The senescence status of older leaves after 12 days of N starvation assessed by SPAD, photosynthesis and the expression of the senescence-specific cysteine protease gene SAG12-1 revealed that the stay-green phenotype of the cvs. NPZ-1 and Apex under N starvation was primarily under the control of leaf-inherent factors. The same four cultivars were submitted to N starvation for up to 12 days in a time-course experiment. The specific leaf contents of biologically active and inactive cytokinins (CKs) and the expression of genes involved in CK homeostasis revealed that under N starvation leaves of early-senescing cultivars were characterized by inactivation of biologically active CKs, whereas in stay-green cultivars synthesis, activation, binding of and response to biologically active CKs were favoured. These results suggest that the homeostasis of biologically active CKs was the predominant leaf-inherent factor for cultivar differences in N starvation-induced leaf senescence and thus N efficiency. eng
dc.language.iso eng
dc.publisher Oxford : Oxford University Press
dc.relation.ispartofseries Journal of Experimental Botany 66 (2015), Nr. 13
dc.rights CC BY 3.0
dc.rights.uri https://creativecommons.org/licenses/by/3.0/
dc.subject Brassica napus eng
dc.subject cytokinins eng
dc.subject genotypic differences eng
dc.subject leaf senescence eng
dc.subject nitrogen efficiency eng
dc.subject nitrogen starvation eng
dc.subject reciprocal grafting eng
dc.subject stay-green. eng
dc.subject Photosynthesis eng
dc.subject Cultivar eng
dc.subject Chlorophyll eng
dc.subject Brassica eng
dc.subject Photosynthetic capacity eng
dc.subject Zeatin eng
dc.subject Senescence eng
dc.subject Botany eng
dc.subject Apex (geometry) eng
dc.subject Biology eng
dc.subject.ddc 580 | Pflanzen (Botanik) ger
dc.title Differences between winter oilseed rape (Brassica napus L.) cultivars in nitrogen starvation-induced leaf senescence are governed by leaf-inherent rather than root-derived signals
dc.type article
dc.type Text
dc.relation.issn 1460-2431
dc.relation.issn 0022-0957
dc.relation.doi https://doi.org/10.1093/jxb/erv170
dc.bibliographicCitation.issue 13
dc.bibliographicCitation.volume 66
dc.bibliographicCitation.firstPage 3669
dc.bibliographicCitation.lastPage 3681
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


Files in this item

This item appears in the following Collection(s):

Show simple item record

 

Search the repository


Browse

My Account

Usage Statistics