NDLI: Thaxtomin A-deficient endophytic Streptomyces sp. enhances plant disease resistance to pathogenic Streptomyces scabies

Content Provider	Springer Nature Link
Author	Lin, Lan Ge, Hui Ming Yan, Tong Qin, Yan Hua Tan, Ren Xiang
Copyright Year	2012
Abstract	Each plant species in nature harbors endophytes, a community of microbes living within host plants without causing any disease symptom. However, the exploitation of endophyte-based phytoprotectants is hampered by the paucity of mechanistic understandings of endophyte-plant interaction. We here reported two endophytic Streptomyces isolates IFB-A02 and IFB-A03 recovered from a stress-tolerant dicotyledonous plant Artemisia annua L. After the determination of their non-pathogenicity at the genomic level and from the toxin (thaxtomin A, TXT) level, the endophytism of both isolates was supported by their successful colonization in planta. Of the two endophytes, IFB-A03 was further studied for the mechanism of endophyte-conferred phytoprotection owing to its plant growth promotion in model eudicot Arabidopsis thaliana. Using the endophyte-Arabidopsis co-cultivation system into which pathogenic Streptomyces scabies was introduced, we demonstrated that IFB-A03 pre-inoculation could activate the salicylic acid (SA)-mediated plant defense responses upon pathogen challenge. Moreover, IFB-A03 was shown to partially rescue the defense deficiency in eds5 (enhanced disease susceptibility 5) Arabidopsis mutants, putatively acting at the upstream of SA accumulation in the defense signaling pathway associated with the systemic acquired resistance (SAR). These data suggest that endophytic Streptomyces sp. IFB-A03 could be a promising candidate for biocontrol agents against S. scabies—a causative pathogen of common scab diseases prevailing in agronomic systems.
Starting Page	1849
Ending Page	1861
Page Count	13
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	236
Issue Number	6
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-08-25
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Artemisia annua L. Endophyte Streptomyces sp. Arabidopsis thaliana Plant defense Ecology Plant Sciences Forestry Agriculture
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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