Abstract
Jujube (Ziziphus jujuba), is valued for its fruit, its ornamental quality, and for its use in reforestation. Jujube is considered to be very difficult to root. Five strains of Agrobacterium rhizogenes were tested on eight cultivars of jujube for the induction of roots. Strains of A. rhizogenes used were A4, TR105, AR WT, MT232, and 50. Cultivars of jujube included `Sherwood', `Sugar Cane', `So', `Li', `Silver Hill', `Tiger Tooth', `Lang', and `Contorta'. `Sugar Cane' had the lowest callus rating of the cultivars and `Li' the highest of the cultivars, followed closely by `Tiger Tooth'. `Sugar Cane' consistently had the lowest number of primary and secondary roots, and did not have any tertiary roots. `Li' consistently had the highest number of primary, secondary, and tertiary roots of the cultivars, followed by `Lang'. `Li' had more, longer roots than any of the other cultivars, followed by `Contorta'. `Li' had the best root grade rating of the cultivars. The highest percentage of rooting occurred in `Li' and `Contorta'. `Sugar Cane' had the lowest percentage of rooting. There was no significant effect of strain on any of the rooting parameters measured. Overall, `Li' rooted the best of the cultivars tested in response to Agrobacterium rhizogenes. `Sugar Cane' performed the worst.
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