Caffeic acid-O-methyltransferase(COMT)is a crucial enzyme in the phenylpropanoid metabolic pathway,with significant roles in both the lignin and coumarin pathways.The function of COMT in plant disease resistance has b...Caffeic acid-O-methyltransferase(COMT)is a crucial enzyme in the phenylpropanoid metabolic pathway,with significant roles in both the lignin and coumarin pathways.The function of COMT in plant disease resistance has been demonstrated in several species.Our research identified the potato COMT gene family on a genome-wide scale and StCOMT1 as a candidate gene for enhancing potato disease resistance under DON induction through phylogenetic analyses combined with previously identified metabolic differences and weighted gene co-expression network analysis(WGCNA)results.In order to better understand the function of StCOMT1,heterologous expression and overexpression assays were conducted.StCOMT1 is localized in chloroplasts and was found to catalyze the methylation of substrates to produce ferulic acid and melatonin in vitro.Physiological parameters showed that,compared with wild-type potato plants,StCOMT1-overexpressing plants infected with Fusarium sporotrichioides exhibited smaller lesion areas and lower reactive oxygen species(ROS)levels.High-performance liquid chromatography(HPLC)and RT-qPCR analyses revealed organ-specific accumulation of coumarin-related compounds and organ-specific expression of their corresponding genes in StCOMT1-overexpressing plants post-inoculation.The results indicate that StCOMT1 overexpression in potatoes enhanced resistance to F.sporotrichioides by enhancing reactive oxygen species clearance and promoting organ-specific accumulation of coumarin-related compounds.展开更多
The cDNA fragment encoding caffeic acid 3_O_methyltransferase (COMT) in Chinese white poplar ( Populus tomentosa Carr.) was isolated and cloned by RT_PCR technique. The size of the cDNA fragment is 1 080 bp, which alm...The cDNA fragment encoding caffeic acid 3_O_methyltransferase (COMT) in Chinese white poplar ( Populus tomentosa Carr.) was isolated and cloned by RT_PCR technique. The size of the cDNA fragment is 1 080 bp, which almost covers the whole cDNA_encoding region. Authors’ cDNA fragment in P. tomentosa shares 98.7% homology with the reported corresponding cDNA in the P. tremuloids at nucleotide level, 99.4% homology at amino acid level, respectively. The analysis of Northern dot hybridization showed that COMT is expressed specifically in the developing secondary xylem of stem during the season of xylem differentiation, which means the linkage between the gene expression for a monolignol biosynthetic enzyme and seasonal regulation of xylem development in woody plant.展开更多
基金supported by the National Natural Science Foundation of China(U22A20443)the Heilongjiang Provincial Research Institutes Scientific Research Operating Expenses Project,China(CZKYF2023-1-B020)+1 种基金the Key Research and Development Plan Project of Heilongjiang Province,China(GA23B015)the Young Scientists Fund of the National Natural Science Foundation of China(32201717)。
文摘Caffeic acid-O-methyltransferase(COMT)is a crucial enzyme in the phenylpropanoid metabolic pathway,with significant roles in both the lignin and coumarin pathways.The function of COMT in plant disease resistance has been demonstrated in several species.Our research identified the potato COMT gene family on a genome-wide scale and StCOMT1 as a candidate gene for enhancing potato disease resistance under DON induction through phylogenetic analyses combined with previously identified metabolic differences and weighted gene co-expression network analysis(WGCNA)results.In order to better understand the function of StCOMT1,heterologous expression and overexpression assays were conducted.StCOMT1 is localized in chloroplasts and was found to catalyze the methylation of substrates to produce ferulic acid and melatonin in vitro.Physiological parameters showed that,compared with wild-type potato plants,StCOMT1-overexpressing plants infected with Fusarium sporotrichioides exhibited smaller lesion areas and lower reactive oxygen species(ROS)levels.High-performance liquid chromatography(HPLC)and RT-qPCR analyses revealed organ-specific accumulation of coumarin-related compounds and organ-specific expression of their corresponding genes in StCOMT1-overexpressing plants post-inoculation.The results indicate that StCOMT1 overexpression in potatoes enhanced resistance to F.sporotrichioides by enhancing reactive oxygen species clearance and promoting organ-specific accumulation of coumarin-related compounds.
文摘The cDNA fragment encoding caffeic acid 3_O_methyltransferase (COMT) in Chinese white poplar ( Populus tomentosa Carr.) was isolated and cloned by RT_PCR technique. The size of the cDNA fragment is 1 080 bp, which almost covers the whole cDNA_encoding region. Authors’ cDNA fragment in P. tomentosa shares 98.7% homology with the reported corresponding cDNA in the P. tremuloids at nucleotide level, 99.4% homology at amino acid level, respectively. The analysis of Northern dot hybridization showed that COMT is expressed specifically in the developing secondary xylem of stem during the season of xylem differentiation, which means the linkage between the gene expression for a monolignol biosynthetic enzyme and seasonal regulation of xylem development in woody plant.
