dc.identifier.uri |
http://dx.doi.org/10.15488/4994 |
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dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/5038 |
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dc.contributor.author |
Koeslin-Findeklee, Fabian
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dc.contributor.author |
Becker, Martin A.
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dc.contributor.author |
van der Graaff, Eric
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dc.contributor.author |
Roitsch, Thomas
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dc.contributor.author |
Horst, Walter J.
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dc.date.accessioned |
2019-06-26T06:32:26Z |
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dc.date.available |
2019-06-26T06:32:26Z |
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dc.date.issued |
2015 |
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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 |
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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 |
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dc.publisher |
Oxford : Oxford University Press |
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dc.relation.ispartofseries |
Journal of Experimental Botany 66 (2015), Nr. 13 |
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dc.rights |
CC BY 3.0 Unported |
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dc.rights.uri |
https://creativecommons.org/licenses/by/3.0/ |
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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 |
eng |
dc.type |
Article |
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dc.type |
Text |
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dc.relation.issn |
1460-2431 |
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dc.relation.issn |
0022-0957 |
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dc.relation.doi |
https://doi.org/10.1093/jxb/erv170 |
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dc.bibliographicCitation.issue |
13 |
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dc.bibliographicCitation.volume |
66 |
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dc.bibliographicCitation.firstPage |
3669 |
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dc.bibliographicCitation.lastPage |
3681 |
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dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
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