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Jordi W, Schapendonk A, Davelaar E, Stoopen GM, Pot CS, De Visser R, Van Rhijn JA, Gan S, Amasino RM
Increased cytokinin levels in transgenic PSAG12-IPT tobacco plants have large direct and indirect effects on leaf senescence, photosynthesis and N partitioning
Plant, Cell and Environment 23(3) (2000)
279-289
|
b-D-Ribf-(1-7)-Subst
Subst = trans-zeatin = SMILES C/C(=C\CNC1=NC=NC2=C1{7}NC=N2)/{13}CO |
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Nicotiana tabacum
(NCBI TaxID 4097,
species name lookup)
Nicotiana tabacum cv. Wisconsin 38
(Ancestor NCBI TaxID 4097,
species name lookup)
Taxonomic group: plant / Streptophyta
(Phylum: Streptophyta)
Organ / tissue: leaf
Publication DOI: 10.1046/j.1365-3040.2000.00544.xJournal NLM ID: 9309004Publisher: Blackwell Scientific Publications
Correspondence: a.j.c.devisser
ab.wag-ur.nl
Institutions: Department of Biochemistry, University of Wisconsin, Madison, USA, Research Institute for Agrobiology and Soil Fertility (AB), Wageningen, The Netherlands, RIKILT, Wageningen, The Netherlands, Department of Agronomy and Tobacco and Health Research Institute, University of Kentucky, Lexington, USA
We studied the impact of delayed leaf senescence on the functioning of plants growing under conditions of nitrogen remobilization. Interactions between cytokinin metabolism, Rubisco and protein levels, photosynthesis and plant nitrogen partitioning were studied in transgenic tobacco (Nicotiana tabacum L.) plants showing delayed leaf senescence through a novel type of enhanced cytokinin syn-thesis, i.e. targeted to senescing leaves and negatively auto-regulated (PSAG12–IPT), thus preventing developmental abnormalities. Plants were grown with growth-limiting nitrogen supply. Compared to the wild-type, endogenous levels of free zeatin (Z)- and Z riboside (ZR)-type cytokinins were increased up to 15-fold (total ZR up to 100-fold) in senescing leaves, and twofold in younger leaves of PSAG12–IPT. In these plants, the senescence-associated declines in N, protein and Rubisco levels and photosynthesis rates were delayed. Senescing leaves accumulated more (15N-labelled) N than younger leaves, associated with reduced shoot N accumulation (–60%) and a partially inverted canopy N profile in PSAG12–IPT plants. While root N accumulation was not affected, N translocation to non-senescing leaves was progressively reduced. We discuss potential consequences of these modified sink–source relations, associated with delayed leaf senescence, for plant productivity and the efficiency of utilization of light and minerals.
cytokinins, Chlorophyll, photosynthesis, transgenic plants, canopy N profile, isopentenyl transferase, N-15, Rubisco, remobilization, senescence-associated gene, sink activity
Structure type: monomer
Location inside paper: p. 284, Table 2
Trivial name: zeatinriboside
Compound class: glycoside, cytokinin
Contained glycoepitopes: IEDB_149136
Methods: SDS-PAGE, enzyme immunoassay, ESI-MS, biological assays, radiolabeling, HPLC, extraction, column chromatography, isotopic labeling, LC-MS/MS, precipitation, spectrophotometry, evaporation, centrifugation, immunoaffinity chromatography, densitometry
Related record ID(s): 66457
NCBI Taxonomy refs (TaxIDs): 4097
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Jordi W, Schapendonk A, Davelaar E, Stoopen GM, Pot CS, De Visser R, Van Rhijn JA, Gan S, Amasino RM
Increased cytokinin levels in transgenic PSAG12-IPT tobacco plants have large direct and indirect effects on leaf senescence, photosynthesis and N partitioning
Plant, Cell and Environment 23(3) (2000)
279-289
|
b-D-Ribf-(1-7)-Subst
Subst = dihydrozeatin = SMILES C/C(CCNC1=NC=NC2=C1{7}NC=N2)/{13}CO |
Show graphically |
Nicotiana tabacum
(NCBI TaxID 4097,
species name lookup)
Nicotiana tabacum cv. Wisconsin 38
(Ancestor NCBI TaxID 4097,
species name lookup)
Taxonomic group: plant / Streptophyta
(Phylum: Streptophyta)
Organ / tissue: leaf
Publication DOI: 10.1046/j.1365-3040.2000.00544.xJournal NLM ID: 9309004Publisher: Blackwell Scientific Publications
Correspondence: a.j.c.devisser
ab.wag-ur.nl
Institutions: Department of Biochemistry, University of Wisconsin, Madison, USA, Research Institute for Agrobiology and Soil Fertility (AB), Wageningen, The Netherlands, RIKILT, Wageningen, The Netherlands, Department of Agronomy and Tobacco and Health Research Institute, University of Kentucky, Lexington, USA
We studied the impact of delayed leaf senescence on the functioning of plants growing under conditions of nitrogen remobilization. Interactions between cytokinin metabolism, Rubisco and protein levels, photosynthesis and plant nitrogen partitioning were studied in transgenic tobacco (Nicotiana tabacum L.) plants showing delayed leaf senescence through a novel type of enhanced cytokinin syn-thesis, i.e. targeted to senescing leaves and negatively auto-regulated (PSAG12–IPT), thus preventing developmental abnormalities. Plants were grown with growth-limiting nitrogen supply. Compared to the wild-type, endogenous levels of free zeatin (Z)- and Z riboside (ZR)-type cytokinins were increased up to 15-fold (total ZR up to 100-fold) in senescing leaves, and twofold in younger leaves of PSAG12–IPT. In these plants, the senescence-associated declines in N, protein and Rubisco levels and photosynthesis rates were delayed. Senescing leaves accumulated more (15N-labelled) N than younger leaves, associated with reduced shoot N accumulation (–60%) and a partially inverted canopy N profile in PSAG12–IPT plants. While root N accumulation was not affected, N translocation to non-senescing leaves was progressively reduced. We discuss potential consequences of these modified sink–source relations, associated with delayed leaf senescence, for plant productivity and the efficiency of utilization of light and minerals.
cytokinins, Chlorophyll, photosynthesis, transgenic plants, canopy N profile, isopentenyl transferase, N-15, Rubisco, remobilization, senescence-associated gene, sink activity
Structure type: monomer
Location inside paper: p. 284, Table 2
Trivial name: dihydrozeatinriboside
Compound class: glycoside
Contained glycoepitopes: IEDB_149136
Methods: SDS-PAGE, enzyme immunoassay, ESI-MS, biological assays, radiolabeling, HPLC, extraction, column chromatography, isotopic labeling, LC-MS/MS, precipitation, spectrophotometry, evaporation, centrifugation, immunoaffinity chromatography, densitometry
Related record ID(s): 66456
NCBI Taxonomy refs (TaxIDs): 4097
Show glycosyltransferases
There is only one chemically distinct structure:
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