Abstract:
:Homospermidine synthase is the first specific enzyme in the biosynthesis of pyrrolizidine alkaloids. Whereas the substrates putrescine and spermidine are part of the highly dynamic polyamine pool of plants, the product homospermidine is incorporated exclusively into the necine base moiety of pyrrolizidine alkaloids. Recently, the gene encoding homospermidine synthase has been shown to have been recruited several times independently during angiosperm evolution by the duplication of the gene encoding deoxyhypusine synthase. To test whether high levels of homospermidine suffice for conversion, at least in traces, to precursors of pyrrolizidine alkaloids, transgenic tobacco plants were generated expressing homospermidine synthase. Analyses of the polyamine content revealed that, in the transgenic plants, about 80% of spermidine was replaced by homospermidine without any conspicuous modifications of the phenotype. Tracer-feeding experiments and gas chromatographic analyses suggested that these high levels of homospermidine were not sufficient to explain the formation of alkaloid precursors. These results are discussed with respect to current models of pathway evolution.
journal_name
Plant Mol Bioljournal_title
Plant molecular biologyauthors
Abdelhady MI,Beuerle T,Ober Ddoi
10.1007/s11103-009-9514-xsubject
Has Abstractpub_date
2009-09-01 00:00:00pages
145-55issue
1-2eissn
0167-4412issn
1573-5028journal_volume
71pub_type
杂志文章abstract::Using a yeast two-hybrid system, we identified a plant cellular factor that interacts with the proteins of the Cucumber mosaic virus (CMV). Initially 14 candidate genes were isolated from Nicotiana tabacum, using a full-length CMV 1a gene as bait. Among the candidate genes, two were encoding thaumatin-like proteins (T...
journal_title:Plant molecular biology
pub_type: 杂志文章
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abstract::Using RNA from developing cotyledons and leaves of bean two products were synthesizedin vitro, with Mr 31000 and 31500 which are antigenically related to the subunit of phytoferritin (Mr 26500). The relative abundance of the two products is dependent on the type of tissue from which the RNA was derived. Evidence is pr...
journal_title:Plant molecular biology
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
pub_type: 杂志文章
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journal_title:Plant molecular biology
pub_type: 杂志文章
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/s11103-005-0698-4
更新日期:2005-03-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/s11103-006-9023-0
更新日期:2006-10-01 00:00:00
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journal_title:Plant molecular biology
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更新日期:1989-11-01 00:00:00
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
pub_type: 杂志文章
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更新日期:1995-02-01 00:00:00
abstract:KEY MESSAGE:Lack of structural components results in inflorescence stem bending. Differentially expressed genes involved in lignin and hemicellulose biosynthesis are vital; genes involved in cellulose and glycan biosynthesis are also relevant. An erect inflorescence stem is essential for high-quality cut herbaceous peo...
journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/s11103-019-00945-4
更新日期:2020-02-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
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更新日期:2013-10-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
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journal_title:Plant molecular biology
pub_type: 杂志文章
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更新日期:2009-08-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/s11103-006-0037-4
更新日期:2006-07-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/BF00042073
更新日期:1995-08-01 00:00:00
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journal_title:Plant molecular biology
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更新日期:2012-07-01 00:00:00
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更新日期:2019-11-01 00:00:00
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
pub_type: 杂志文章
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更新日期:1998-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:2000-05-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
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更新日期:1999-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:2009-01-01 00:00:00
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journal_title:Plant molecular biology
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/BF00039617
更新日期:1993-01-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
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更新日期:2020-10-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1007/BF00020388
更新日期:1995-06-01 00:00:00