אסיף מאגר המחקר החקלאי

The operon for cytokinin biosynthesis of Erwinia herbicola pv. gypsophilae contains two promoters and is plant induced

Year:

2001

Source of publication :

Authors :

Volume :

47

Co-Authors:

Guo, M., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Manulis, S.
Barash, I., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Lichter, A.

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Link :

Abstract:

The operon for cytokinin biosynthesis in the gall-forming bacterium Erwinia herbicola pv. gypsophilae (Ehg) has been previously shown to reside on an indigenous plasmid (pPATHEhg) that is mandatory for pathogenicity. This operon consists of two genes: the first open reading frame (pre-etz) is of unknown function, whereas the second one (etz) encodes for isopentenyl transferase. Northern hybridization performed with the wild-type strain Ehg824-1 grown in Luria-Bertani broth demonstrated two transcripts of which an etz-specific transcript (1.0 kb) was predominant. Fusion of upstream DNA fragments of both pre-etz and etz to the ice nucleation reporter gene inaZ in pVSP61 showed high ice nucleation activity in both cultures, confirming the presence of two independent promoters. An increase of 1-1.5 orders in transcriptional activity of these promoters was observed following inoculation of gypsophila cuttings. Mutants of Ehg824-1 were generated by insertion of inaZ into pre-etz and etz using the transposon reporter Tn3-Spice. An increase of about two orders in transcriptional activity was recorded with both mutants following inoculation of gypsophila or bean cuttings. A similar induction was also observed when the bacteria were applied to the leaf surface of these plants. Unlike other virulence genes present on the pPATHEhg, neither pre-etz nor etz was regulated by the adjacent hrp gene cluster.

Note:

The correct link to the article:

https://www.nrcresearchpress.com/doi/abs/10.1139/w01-116#.XIevxChvaM8

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