New Insights on Endophytic Microbacterium-Assisted Blast Disease Suppression and Growth Promotion in Rice: Revelation...

Area of Science:

• Microbiology
• Plant Pathology
• Agricultural Science

Background:

• Endophytic microbes offer plant fitness benefits.
• Microbacterium testaceum is investigated for agricultural applications.

Purpose of the Study:

• To characterize agriculturally beneficial traits of rice-leaf-adapted Microbacterium testaceum.
• To evaluate its potential for managing rice blast disease.

Main Methods:

• Polyphasic taxonomy for identification.
• Confocal microscopy for endophytism confirmation.
• Biochemical assays for plant growth-promoting traits.
• Tobacco leaf infiltration for pathogenicity assessment.
• Antifungal assays against Magnaporthe oryzae.
• GC-MS analysis of volatile organic compounds.
• Rice seedling bacterization and gene expression analysis (OsNPR1, OsCERK).

Main Results:

• M. testaceum confirmed as endophytic in rice leaves.
• Demonstrated mineral solubilization, IAA, ammonia, and enzyme production.
• Exhibited non-pathogenic nature and antifungal activity against M. oryzae.
• Induced MAMP-triggered immunity (MTI) and blast suppressive activity in rice.
• Caused transcriptional tradeoff between growth and defense pathways.

Conclusions:

• M. testaceum possesses significant plant probiotic and disease suppressive traits.
• Its ability to elicit plant defense mechanisms is crucial for rice blast management.
• Paves the way for developing M. testaceum-based bioformulations for sustainable agriculture.