INFLUNCE OF AUXIN AND POLYAMINEES ON ROOTING OF SHOOTS OF CITRUS VOLKAMERIANA ROOTSTOCK IN VITRO

This  research  was  conducted  in  the  plant  tissue  culture  Lab. College  of Agriculture / University  of  Baghdad  from  February to  October  2015. The aim  of  the  study  was  investigating  the  influence  of  combinations  of Indole  butyric  acid (IBA) ,  Naphthalene  acetic  acid (NAA) and  polyamine Spermidine (Spd.) on rooting of shoots of  citrus volkameriana rootstock cultured  on 1\2  MS medium. The Results indicated that 1/2 MS medium supplemented  with 1.0 mg L-1 (IBA)  gave the highest  percentage  of  rooting  (67 %) which differed significantly  from the MS medium with free auxin IBA  that gave (22%) while  the  MS medium  supplemented with 0.5 mg L-1  spermidine  gave the highest percentage of rooting (63%) that was not significantly different  than other concentrations of Spd . MS medium supplemented with 1.0 mg L-1 IBA and 0.5 mg L-1 Spd. gave the highest percentage of rooting (83%) and the highest root number / shoot (3.17) and highest length of root (3.15 cm) while the MS medium with free auxin IBA and spd. did not give percentage of rooting (0%) for citrus volkameriana rootstock plantlets . The MS medium supplemented with 1.0 mg L-1 NAA gave the highest percentage of rooting (56%) which differed significantly from MS medium with free auxin NAA that gave (22%)  while MS medium supplemented with 0.5mg L-1 spd. gave the highest percentage of rooting (50%) that was not significantly different from other concentration of Spd . MS medium supplemented with 1.0 mg L-1 NAA and 0.5 mg L-1 Spd. gave the highest percentage of rooting (68%) and the highest root number /shoot (2.5) and highest length of root (2.65 cm) while the MS medium with free auxin NAA and Spd. did not gave percentage of rooting (0%) .