This book emphasized on three points: first effect of growth conditions(Field and greenhouse) on endogenous sugar(sucrose, glucose, fructose and starch) content of turnip tuber and sugar trans-location during turnip tuber formation, second in vitro protocol optimization(sucrose,medium, photo-period and hormones(GA and BAP)) and third effect of BAP(15mg/l)containing medium in vitro condition on 21 turnip tuber related genes expression.