title: Molecular Cloning, Characterization, and Expression Analysis of Lignin Genes from Sugarcane Genotypes Varying in Lignin Content.
abstract: Sugarcane (Saccharum spp.) is one of the highest biomass-producing plant and the best lignocellulosic feedstock for ethanol production. To achieve more efficient conversion of biomass to ethanol, a better understanding of the main factors affecting biomass recalcitrance is needed. Therefore, with this objective, here, we report a systematic study on lignin content, deposition, identification, and cloning of genes involved in lignin biosynthesis and their differential expression in five sugarcane clones, EC11003, EC11010, IK 76-91, IK 76-99, and Co 86032. Lignin content among the clones varied from 26.87 to 23.19 % with the highest in the clone EC11010 and the lowest in high sugar Co86032. Lignin deposition studied through phloroglucinol staining of the cell walls implied that the sclerenchyma cells of the energy canes (EC11010 and EC11003) have more lignin deposition followed by the Erianthus (IK 76-91 and IK 76-99) clones whereas Co86032 has the minimum amount of lignin deposition. We cloned partial coding regions of important genes of lignification COMT (650 bp), CCR (332 bp), and PAL (650 bp) from Erianthus, wild relative of sugarcane followed by the expression analysis through real-time PCR. Differential expression analysis showed high level of expression for the three genes in the energy cane EC11010.
authors.affiliation: Genomics Laboratory, Division of Crop Improvement, Sugarcane Breeding Institute, Coimbatore, Tamil Nadu, 641007, India. K.Lakshmi@icar.gov.in.
authors.forename: Lakshmi
authors.initials: L
authors.lastname: Kasirajan
authors.affiliation: Genomics Laboratory, Division of Crop Improvement, Sugarcane Breeding Institute, Coimbatore, Tamil Nadu, 641007, India.|SRF, Centre for Plant Molecular Biology Department, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, 641007, India.
authors.forename: Kalaivaani
authors.initials: K
authors.lastname: Aruchamy
authors.affiliation: Genomics Laboratory, Division of Crop Improvement, Sugarcane Breeding Institute, Coimbatore, Tamil Nadu, 641007, India.
authors.forename: Prathima P
authors.initials: PP
authors.lastname: Thirugnanasambandam
authors.affiliation: Genomics Laboratory, Division of Crop Improvement, Sugarcane Breeding Institute, Coimbatore, Tamil Nadu, 641007, India.
authors.forename: Selvi
authors.initials: S
authors.lastname: Athiappan
mesh_terms: D000595:Amino Acid Sequence; D002473:Cell Wall / Q000378:metabolism; D003001:Cloning, Molecular; D018506:Gene Expression Regulation, Plant; D005838:Genotype; D008031:Lignin / Q000378:metabolism*; D031786:Saccharum / Q000166:cytology / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism*; D017421:Sequence Analysis
chemical_list: D008031:Lignin
keywords: Cell wall genes; Energy canes; Lignocellulosic biofuel; Saccharification; Sugarcane