Astract: In order to study the effects of BA hormone levels (0, 0,01, 0.1, 3, 5 and 10 mg/L) in vitro culture of poinsettia (Euphorbia pulcherrima wild), an experiment as RCBD with four replications was conducted during 2010 at Research Laboratory of Faculty of Agriculture, Lahijan University in Iran. The culture bed were contained MS, sucrose (3%) and agar (75%). The results show that BA hormone levels on shoot length in vitro culture of poinsettia had a significant difference in 1 % probability level. The highest shoot length in vitro culture of poinsettia was obtained with application 3 mg/L BA hormone (8.57 mm). The lowest shoot length in vitro culture of tea was obtained with application 0 mg/L BA hormone (4.28 mm).
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