Molecular Plant-Microbe Interactions (2008) 21, 1643-1653

Mi Seong Kim, Song Mi Cho, Eun Young Kang, Yang Ju Im, Hoon Hwangbo, Young Cheol Kim, Choong-Min Ryu, Kwang Yeol Yang, Gap Chae Chung and Baik Ho Cho (2008)
Galactinol is a signaling component of the induced systemic resistance caused by Pseudomonas chlororaphis O6 root colonization
Molecular Plant-Microbe Interactions 21 (12), 1643-1653
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.
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Link to article at publishers website
Database assignments for author(s): Choong-Min Ryu

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Corynespora cassiicola
Pseudomonas chlororaphis (antagonist)	Corynespora cassiicola