Physiological Respon of Tpd-affected Rubber Plant to Growth Regulator and Antioxidant Treatments

: The research aimed to determine bark and latex the effect of applied NAA on thiol content, total protein and peroxidase activity in the bark and latex of TPD –affected rubber tree ( Hevea brasiliensis muell Arg.). The research was conducted at the Sungei Putih Estate with 54 meters altitude, in leaf fall session from January 2018 to July 2018. The experiment was design using Split Plot Design, with three factors i.e: clones (RRIM 921 and PB 260), condition of plants (Healthy and TPD) and the formula (control, 2.5% and 5% the stimulants). Parameter observed were thiol and protein content and peroxidase activity . The results showed that the range of values bark and latex are Thiol 0.1-1.7 µM, Protein 31-124 ppm and Peroxidase 0,01- 0,9 unit/ppm protein, the clone of rubber plants was significantly affected the thiol’s. The NAA application could improve the physiological characters of the rubber plant and the activities from all parameters significantly affected by environmental conditions.