Abstract:
:In this study, attempt has been made to produce a selected cultivar of tea with low-caffeine content using RNAi technology. The caffeine biosynthetic pathway in tea has been proposed to involve three N-methyltransferases such as xanthosine methyltransferase, 7-N-methylxanthine methyltransferase and 3, 7-dimethylxanthine methyltransferase. Last two steps of caffeine biosynthesis in tea have been known to be catalyzed by a bifunctional enzyme known as caffeine synthase. To suppress the caffeine synthesis in the selected tea [Camellia sinensis (L.) O. Kuntze] cv. Kangra jat, we isolated a partial fragment of caffeine synthase (CS) from the same cultivar and used to design RNAi construct (pFGC1008-CS). Somatic embryos were transformed with the developed construct using biolistic method. Transformed somatic embryos showed reduction in the levels of CS transcript expression as well as in caffeine content. Plants were regenerated from the transformed somatic embryos. Transgenic plants showed a significant suppression of CS transcript expression and also showed a reduction of 44-61% in caffeine and 46-67% in theobromine contents as compared to the controls. These results suggest that the RNAi construct developed here using a single partial fragment of CS gene reduced the expression of the targeted endogenous gene significantly. However, the reduction in theobromine content in addition to caffeine documented the involvement of this single CS in the catalysis of last two methyl transfer steps in caffeine biosynthesis of tea.
journal_name
Plant Mol Bioljournal_title
Plant molecular biologyauthors
Mohanpuria P,Kumar V,Ahuja PS,Yadav SKdoi
10.1007/s11103-011-9785-xsubject
Has Abstractpub_date
2011-08-01 00:00:00pages
523-34issue
6eissn
0167-4412issn
1573-5028journal_volume
76pub_type
杂志文章abstract::RNA silencing is a sequence-specific RNA degradation mechanism found in most eukaryotes, where small cleavage products (siRNAs) of double stranded RNA (dsRNA) mediate silencing of genes with sequence identity to the dsRNA inducer. In several systems, silencing has been found to spread from the dsRNA inducer sequence i...
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
doi:10.1007/BF00032663
更新日期:1995-09-01 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/BF00018558
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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:10.1023/a:1005867215258
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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,评审
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更新日期:2010-09-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1023/a:1005736722794
更新日期:1997-04-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章
doi:10.1023/a:1006464822434
更新日期:2000-09-01 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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journal_title:Plant molecular biology
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pub_type: 杂志文章
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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:1995-01-01 00:00:00
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journal_title:Plant molecular biology
pub_type: 杂志文章,评审
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更新日期:2018-09-01 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:2016-06-01 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:1995-01-01 00:00:00