ArticlePlanta2026
Bacillus amyloliquefaciens-responsive rice basic helix-loop-helix gene acts as putative regulator of phenylpropanoid pathway, carbohydrate metabolism, and ion homeostasis under nutrient-deficient conditions.
Article in Planta, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
MAIN
conclusionIn conclusion, the present study provides preliminary functional insights into the role of OsbHLH in promoting plant growth under low-nutrient conditions. Ectopic expression of OsbHLH in Arabidopsis was associated with improved plant performance at morphological, physiological, biochemical, and molecular levels under sub-optimal nutrient regimes. Taken together, the study indicates that OsbHLH could be a key component of the regulatory framework of plant-PGPR interactions and nutrient stress responses; further targeted studies are required to conclusively establish its precise functional role and underlying mechanisms. Plant growth-promoting rhizobacteria (PGPR) enhance plant performance under environmentally adverse conditions. In the present study, we analyzed the functional relevance of OsbHLH (OsbHLH63) gene that was notably upregulated in rice following SN13 inoculation under nutrient-deficient conditions. Ectopic expression of OsbHLH in Arabidopsis thaliana resulted in improved growth, and enhanced physio-biochemical attributes under nutrient-deficient conditions. Transgenic plants also exhibited modifications in tissue organization, cellular structure, and lignification patterns. Gene expression analysis revealed differential expression of genes involved in nutrient uptake and transport (IRT1, PHR1, ZNE, NRT, and KUP), lignin biosynthesis (CAD1, CCR1, and COMT), and carbohydrate metabolism (PK1, PEPC1, GDH, FBP, and ENO). Additionally, GC-MS-based metabolomic profiling revealed 40 significantly affected metabolites associated with galactose metabolism, propanoate metabolism, amino acid biosynthesis, the pentose phosphate pathway, the TCA cycle, and glycolysis/gluconeogenesis. Collectively, these findings affirm the potential involvement of OsbHLH in nutrient stress adaptation and in recapitulating key aspects of SN13-induced responses observed in rice, although further targeted investigations are required to validate its regulatory function in plant-microbe interactions and stress tolerance.
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