Status of Growth Hormone and Its Relationship with Vegetative Growth of Mandarin cv. Batu 55 Resulted from Top Working with Several Interstocks

The research was aimed to obtain information on the status of growth hormone and its relationship to vegetative growth of mandarin cv. Batu 55 resulted from top working technique. The research was done in Indonesian Citrus and Subtropical Fruits Research Institute (ICSFRI), East Java, from April to October 2013. A randomized Complete Block Design was used with 10 treatments which were combined between interstocks and top working technique. The result showed that the highest mandarin cv. Batu 55 leaf auxin concentration was found on treatment of KB/S/JC-SK (mandarin cv. Batu 55/interstock tangerine/JC-bark grafting) about 217,17 mu g/g, while the lowest one was on treatment KB/JC-Ok (mandarin cv. Batu 55/JC-bud grafting) about 9,99 mu g/g. The highest cytokinin concentration was found on treatment of KB/M/JC-SK (mandarin cv. Batu 55/interstock sweet orange/JC-bark grafting) about 13,38 mu g/g, while the lowest one was on treatment of KB/Pr/JC-Ok (mandarin cv. Batu 55/interstock lime/JC-bud grafting) about 2,52 mu g/g. The highest giberellin concentration on treatment of KB/S/JC-Ok (mandarin cv. Batu 55/interstock tangerine/JC-bud grafting) was about 3.122,232 mu g/g, while the lowest on treatment of KB/P/JC-Ok (mandarin cv. Batu 55/interstock pummelo/JC-bud grafting) was about 277,54 mu g/g. Furthermore, the highest abscisic acid was found on treatment of KB/S/JC-SK (mandarin cv. Batu 55/interstock tangerine/JC-bark grafting) which was about 6,88 mu g/g, while it was not detected on KB/P/JC-Ok (mandarin cv. Batu 55/interstock pummelo/JC-bud grafting). The result of correlation analysis showed that the growth of plant height and number of leave is proportional to the increase of cytokinin and gibberellin concentration but negatively influenced by the concentration of auxin and abscisic acid.