Pectin is a widespread complex colloidal substance in the plant cell wall that the main ingredient is a galaeturonie acid, but its specific configuration is still unclear. The structure and physiological functions of pectin and its effects on crop quality are the hot topic in current research. Pectin accounts for about 5% -13% of the total mass in tobocco, which affects the level and sensory quality of tobacco leaf. In the past, little attention has been attached to impact on the quality of tobacco imposed by this kind comp?Lex cel~ wall mater...