Abstract
Jujube (Ziziphus jujuba) is a plant whose cuttings root with great difficulty. Several strains of Agrobacterium rhizogenes were tested on two segments (proximal and basal) of derooted jujube seedlings in the presence or absence of IBA for induction of roots in vitro. Strains of A. rhizogenes used were A4, A4pARC8, TR105, and R1000. Strain, segment of derooted seedling, and IBA influenced inoculation success. Strains A4pARC8 and TR105 were more infective than A4 and R1000. Basal segments were more responsive than proximal ones and 0.5 mg·liter–1 1BA had a positive effect on inoculation success. Agrobacterium rhizogenes and IBA were very effective in promoting root formation, root number, root length, and early root emergence. They worked synergistically, but were effective independently as well. A4pARC8 and TR105 were more effective than strains A4 and R1000, and generally more effective than IBA. lBA was unable to eliminate the differential response of the two segments for individual strains.
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