Additional virulence genes and sonication enhance Agrobacterium tumefaciens-mediated loblolly pine transformation.

Abstract:

:Additional virulence (vir) genes in Agrobacterium tumefaciens and sonication were investigated for their impact on transformation efficiency in loblolly pine (Pinus taeda L.). Mature zygotic embryos of loblolly pine were co-cultivated with disarmed A. tumefaciens strain EHA105 containing either plasmid vector pCAMBIA1301 or vector pCAMBIA1301 with an additional 15.8-kb fragment carrying extra copies of the Vir B, Vir C, and Vir G regions from the supervirulent plasmid pTOK47. pCAMBIA1301 contains hygromycin resistance and the beta-glucuronidase (GUS) reporter gene. Expression of GUS was observed after 3-6 days of co-cultivation, with peak expression at approximately 21 days. The highest numbers of GUS-expressing areas were visible up to 21 days after co-cultivation, declining rapidly thereafter. Both transient and stable transformation efficiencies increased when the explants were sonicated before co-cultivation and/or the additional virB, virC, and virG genes were included with the pCAMBIA1301 plasmid T-DNA. Use of the plasmid with additional vir genes and sonication dramatically enhanced the efficiency of Agrobacterium-mediated gene transfer not only in transient expression but also in the recovery of hygromycin-resistant lines. Stably transformed cultures and transgenic plants were produced from embryos transformed with A. tumefaciens EHA105 carrying pCAMBIA1301 or pCAMBIA1301+pTOK47 in the three families of loblolly pine. The presence of the introduced GUS and hygromycin phosphotransferase genes in the transgenic plants was confirmed by polymerase chain reaction and Southern hybridization analyses.

journal_name

Plant Cell Rep

journal_title

Plant cell reports

authors

Tang W

doi

10.1007/s00299-002-0550-0

keywords:

subject

Has Abstract

pub_date

2003-02-01 00:00:00

pages

555-62

issue

6

eissn

0721-7714

issn

1432-203X

journal_volume

21

pub_type

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