A versatile transposon-based activation tag vector system for functional genomics in cereals and other monocot plants

Shaohong Qu, Aparna Desai, Rod A Wing, Venkatesan Sundaresan

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Transposon insertional mutagenesis is an effective alternative to T-DNA mutagenesis when transformation through tissue culture is inefficient as is the case for many crop species. When used as activation tags, transposons can be exploited to generate novel gain-of-function phenotypes without transformation and are of particular value in the study of polyploid plants where gene knockouts will not have phenotypes. We have developed an in cis-activation- tagging Ac-Ds transposon system in which a T-DNA vector carries a Dissociation (Ds) element containing 4X cauliflower mosaic virus enhancers along with the Activator (Ac) transposase gene. Stable Ds insertions were selected using green fluorescent protein and red fluorescent protein genes driven by promoters that are functional in maize (Zea mays) and rice (Oryza sativa). The system has been tested in rice, where 638 stable Ds insertions were selected from an initial set of 26 primary transformants. By analysis of 311 flanking sequences mapped to the rice genome, we could demonstrate the wide distribution of the elements over the rice chromosomes. Enhanced expression of rice genes adjacent to Ds insertions was detected in the insertion lines using semiquantitative reverse transcription-PCR method. The in cis-two-element vector system requires minimal number of primary transformants and eliminates the need for crossing, while the use of fluorescent markers instead of antibiotic or herbicide resistance increases the applicability to other plants and eliminates problems with escapes. Because Ac-Ds has been shown to transpose widely in the plant kingdom, the activation vector system developed in this study should be of utility more generally to other monocots.

Original languageEnglish (US)
Pages (from-to)189-199
Number of pages11
JournalPlant Physiology
Volume146
Issue number1
DOIs
StatePublished - Jan 2008

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Genomics
Liliopsida
transposons
genomics
rice
Zea mays
Herbicide Resistance
Caulimovirus
Transposases
insertional mutagenesis
Phenotype
phenotype
Plant Genes
Gene Knockout Techniques
Polyploidy
genes
herbicide resistance
Cauliflower mosaic virus
Insertional Mutagenesis
DNA

ASJC Scopus subject areas

  • Plant Science

Cite this

A versatile transposon-based activation tag vector system for functional genomics in cereals and other monocot plants. / Qu, Shaohong; Desai, Aparna; Wing, Rod A; Sundaresan, Venkatesan.

In: Plant Physiology, Vol. 146, No. 1, 01.2008, p. 189-199.

Research output: Contribution to journalArticle

Qu, Shaohong ; Desai, Aparna ; Wing, Rod A ; Sundaresan, Venkatesan. / A versatile transposon-based activation tag vector system for functional genomics in cereals and other monocot plants. In: Plant Physiology. 2008 ; Vol. 146, No. 1. pp. 189-199.
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