Effect of NAA and IBA on rooting of Stevia(Stevia rebundiana)

Abstract

ABSTRACT : The experiment was conducted in the Tissue Culture Laboratory of the Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during June, 2007 to April, 2008 for effect of NAA and IBA on rooting of -stevia (Stevia rebundiana). In this experiment, five levels of NAA (0.0, 0.2, 0.5, 1.0 and 2.0 mg/1) and six levels of IBA (0.0, 0.2, 0.5, 1.0, 2.0 and 4.0 mg/1) were used as explants in the experiment. The treatment effects were found significant in most the characters studied. The highest number of roots per shoot (8.69) was recoded from lmg/1 NAA at 45 days and the longest root (1.72cm) was recorded from 0.2 mg/1 NAA. The concentration of 0.2mg/l IBA was proved to the best regarding the number of roots/shoot (9.51) and the earliest rooting (14.08 days) while 0.5 mg/I IBA produced the highest percentage of root inducing shoots (88.84). The treatment combination N5I2 produced the highest number of root initiation at minimum days and the highest percentage of root inducing shoot and root length were recorded from control treatment (N,I,).