title: Interaction between glucose and brassinosteroid during the regulation of lateral root development in Arabidopsis.
abstract: Glucose (Glc) plays a fundamental role in regulating lateral root (LR) development as well as LR emergence. In this study, we show that brassinosteroid (BR) signaling works downstream of Glc in controlling LR production/emergence in Arabidopsis (Arabidopsis thaliana) seedlings. Glc and BR can promote LR emergence at lower concentrations, while at higher concentrations, both have an inhibitory effect. The BR biosynthesis and perception mutants showed highly reduced numbers of emerged LRs at all the Glc concentrations tested. BR signaling works downstream of Glc signaling in regulating LR production, as in the glucose insensitive2-1brassinosteroid insensitive1 double mutant, Glc-induced LR production/emergence was severely reduced. Differential auxin distribution via the influx carriers AUXIN RESISTANT1/LIKE AUXIN RESISTANT1-3 and the efflux carrier PIN-FORMED2 plays a central role in controlling LR production in response to Glc and BR. Auxin signaling components AUXIN RESISTANT2,3 and SOLITARY ROOT act downstream of Glc and BR. AUXIN RESPONSE FACTOR7/19 work farther downstream and control LR production by regulating the expression of LATERAL ORGAN BOUNDARIES-DOMAIN29 and EXPANSIN17 genes. Increasing light flux could also mimic the Glc effect on LR production/emergence. However, increased light flux could not affect LR production in those BR and auxin signaling mutants that were defective for Glc-induced LR production. Altogether, our study suggests that, under natural environmental conditions, modulation of endogenous sugar levels can manipulate root architecture for optimized development by altering its nutrient/water uptake as well as its anchorage capacity.
authors: National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India.
authors: Aditi
authors: http://orcid.org/0000-0002-3299-1625
authors: A
authors: Gupta
authors: National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India.
authors: Manjul
authors: http://orcid.org/0000-0001-9547-269X
authors: M
authors: Singh
authors: National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India ashverya_laxmi@nipgr.ac.in.
authors: Ashverya
authors: A
authors: Laxmi
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000378:metabolism; D001692:Biological Transport / Q000187:drug effects; D060406:Brassinosteroids / Q000378:metabolism* / Q000494:pharmacology; D004843:Epistasis, Genetic / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D005947:Glucose / Q000378:metabolism* / Q000494:pharmacology; D006593:Hexokinase / Q000378:metabolism; D006720:Homozygote; D007210:Indoleacetic Acids / Q000378:metabolism; D008954:Models, Biological; D009154:Mutation / Q000235:genetics; D010641:Phenotype; D010788:Photosynthesis / Q000187:drug effects; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D029681:Arabidopsis Proteins; D060406:Brassinosteroids; D007210:Indoleacetic Acids; D006593:Hexokinase; C473630:ATHXK1 protein, Arabidopsis; D005947:Glucose