lignification definition plants

Among the many roles lignin plays in plant growth and development are those providing structural support for land plants and as a mechanical barrier in pest resistance. Most trees would topple over without lignin supporting their tissues, in addition to the long, dead cells of the xylem vessels. The lignification proceeds in the ML and the primary wall. lignin [lig´nin] a woody substance closely associated with cellulose in plants and grouped with the polysaccharides, although it is not actually a carbohydrate; it combines with bile acids to prevent their absorption. The lignification of the secondary wall proceeds slowly in the first stage but becomes faster after the thickening has been completed [118, 130]. It is largely a supportive structure and is part of the secondary thickening of tall plants. Meaning of ligneous plant. What does ligneous plant mean? lignification process, cross-sections of the young stem were performed, from 1st to 8th internodes and of adventitious roots (2-17.5 cm from the root cap) of individuals aged between 9 and 20 months. Lignification and the Definition of Lignin Lignification is a process essential to the nature and evolution of vascular plants that is still poorly understood, even though it has been studied for more than a century. Lignin is a critical structural component of plants, providing vascular integrity and mechanical strength. The plants measured between 8 and 12 cm, had 5 to 8 internodes, bright green stems, slightly striated, rectilinear and twisted when the plant Lignification of plant cell walls: Impact of genetic manipulation ... Plants appear to have adapted several strategies to circumvent genetic and metabolic obstacles to making lignin. Lignin precursors (monolignols) must be exported to the extracellular matrix where random oxidative coupling produces a complex lignin polymer. Lignification therefore has a direct and often important impact on the digestible energy (DE) value of the forage. Whereas the importance of lignin in the definition of compression wood mechanical properties is well established [3] , this is far from being the case for tension wood. Lignification is under genetic control and there are considerable differences in lignin lignin (lÄ­g`nÄ­n), a highly polymerized and complex chemical compound especially common in woody plants. ‘As plants do not possess a mechanism to degrade lignins, lignification represents a significant, non-recoverable investment of carbon and energy.’ ‘These include host cell browning around the penetration site, phytoalexin accumulation, lignification and cell wall phenolic deposition, and pathogenesis-related protein induction.’ Although vital to plant fitness, lignin negatively impacts paper pulp processing and feed for livestock. Lignin is the second most abundant polymer found in nature after cellulose. There are a number of plant-related factors that affect lignification in indi-vidual plants and plant communities. Definition of ligneous plant in the Definitions.net dictionary. In addition to using various monolignol precursors, plants also appear to possess a … The cellulose walls of the wood become impregnated with lignin, a process called lignification, which greatly increases the strength and hardness of the cell and gives the necessary rigidity to the tree. Lignin fibers are less digestible by gut bacteria than other polysaccharides. Information and translations of ligneous plant in the most comprehensive dictionary definitions resource on the web. Hence, lignification, among other features, is thought to be important in reaction wood both for its formation and the definition of its properties. When secondary thickening is formed it is called lignification. It is a major constituent of ‘woody’ material. 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