Trehalose-6-phosphate synthase as an intrinsic selection marker for plant transformation.

Abstract:

:Insertion of foreign DNA into plant genomes occurs randomly and with low frequency. Hence, a selectable marker is generally required to identify transgenic plants. Until now, all selection systems have been based on the use of non-plant genes, derived from microorganisms and usually conferring antibiotic or herbicide resistance. The use of microorganism-derived genes however has raised biosafety concerns. We have developed a novel selection system based on enhancing the expression of a plant-intrinsic gene and the use of a harmless selection agent. Selection takes advantage of the reduced glucose sensitivity of seedlings with enhanced expression of AtTPS1, a gene encoding trehalose-6-P synthase. As a result, transformants can be identified as developing green seedlings amongst the background of small, pale non-transformed plantlets on high glucose medium. In addition, vegetative regeneration of tobacco leaf explants is very sensitive to high external glucose. Overexpression of AtTPS1 in tobacco allows selecting glucose insensitive transgenic shoots.

journal_name

J Biotechnol

journal_title

Journal of biotechnology

authors

Leyman B,Avonce N,Ramon M,Van Dijck P,Iturriaga G,Thevelein JM

doi

10.1016/j.jbiotec.2005.08.033

subject

Has Abstract

pub_date

2006-02-10 00:00:00

pages

309-17

issue

3

eissn

0168-1656

issn

1873-4863

pii

S0168-1656(05)00541-9

journal_volume

121

pub_type

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