Galactinol is a signaling component of the induced systemic resistance caused by Pseudomonas chlororaphis O6 root colonization

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Title
Galactinol is a signaling component of the induced systemic resistance caused by Pseudomonas chlororaphis O6 root colonization
Author(s)
M S Kim; S M Cho; E Y Kang; Y J Im; H Hwangbo; Y C Kim; Choong-Min Ryu; K Y Yang; G C Chung; B H Cho
Bibliographic Citation
Molecular Plant-Microbe Interactions, vol. 21, no. 12, pp. 1643-1653
Publication Year
2008
Abstract
Root colonization by Pseudomonas chlororaphis O6 in cucumber elicited an induced systemic resistance (ISR) against Corynespora cassiicola. In order to gain insight into O6-mediated ISR, a suppressive subtractive hybridization technique was applied and resulted in the isolation of a cucumber galactinol synthase (CsGolS1) gene. The transcriptional level of CsGolS1 and the resultant galactinol content showed an increase several hours earlier under O6 treatment than in the water control plants following C. cassiicola challenge, whereas no difference was detected in the plants without a pathogen challenge. The CsGolS1-overexpressing transgenic tobacco plants demonstrated constitutive resistance against the pathogens Botrytis cinerea and Erwinia carotovora, and they also showed an increased accumulation in galactinol content. Pharmaceutical application of galactinol enhanced the resistance against pathogen infection and stimulated the accumulation of defense-related gene transcripts such as PR1a, PR1b, and NtACS1 in wild-type tobacco plants. Both the CsGolS1-overexpressing transgenic plants and the galactinol-treated wild-type tobacco plants also demonstrated an increased tolerance to drought and high salinity stresses.
ISSN
0894-0282
Publisher
Amer Phytopathological Soc
DOI
http://dx.doi.org/10.1094/MPMI-21-12-1643
Type
Article
Appears in Collections:
Division of Research on National Challenges > Infectious Disease Research Center > 1. Journal Articles
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