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Effect of loss of T-DNA genes on MIA biosynthetic pathway gene regulation and alkaloid accumulation in Catharanthus roseus hairy roots

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Title Effect of loss of T-DNA genes on MIA biosynthetic pathway gene regulation and alkaloid accumulation in Catharanthus roseus hairy roots
 
Creator Taneja, Jyoti
Jaggi, Monika
Wankhede, Dhammaprakash Pandhari
Sinha, Alok Krishna
 
Subject Agrobacterium rhizogenes
Catharanthus roseus
Hairy root culture
Monoterpenoid indole alkaloid pathway
Ri T-DNA genes
 
Description Hairy roots are generated by integration of T-DNA in host plant genome from root inducing (Ri) plasmid of Agrobacterium rhizogenes and have been utilized for production of secondary metabolites in different plant systems. In Catharanthus roseus, hairy roots are known to show different morphologies, growth patterns, and alkaloid contents. It is also known that during transformation, there is a differential loss of a few T-DNA genes. To decipher the effect of loss of T-DNA genes on the various aspects of hairy roots, ten hairy root clones were analyzed for the presence or absence of T-DNA genes and its implications. It was found that the loss of a few ORFs drastically affects the growth and morphological patterns of hairy roots. The absence of T(R)-DNA from hairy roots revealed increased transcript accumulation and higher alkaloid concentrations, whereas callusing among hairy root lines led to decreased transcript and alkaloid accumulation. Significantly higher expression of MIA biosynthetic pathway genes and low abundance of regulator transcripts in hairy root clones in comparison with non-transformed control roots were also observed. This study indicates that it is not only the integration of T-DNA at certain region of host plant genome but also the presence or absence of important ORFs that affects the expression patterns of MIA biosynthetic pathway genes, regulators, and accumulation of specific alkaloids.
This work is supported by financial assistance from the core grant of
National Institute of Plant Genome Research, New Delhi, India.
 
Date 2014-02-24T10:23:56Z
2014-02-24T10:23:56Z
2010
26 June 2010
 
Type Article
 
Identifier Plant Cell Reports, 29(10): 1119-1129
http://hdl.handle.net/123456789/162
 
Language en
 
Publisher Springer