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Explants of sweet potato ( Ipomoea batatas ) and garden egg plant ( Solanum integrifolium ) were cocultivated with disarmed strains of  Agrobacterium tumefaciens  containing binary vectors with  gusA, gusA-nptll  fusion or gusA-intron genes. We examined whether the addition of  vir  gene inducers during cocultivation would improve the transformation in both crops. Acetosyringone and galacturonic acid were tested individually and in combination. A very high GUS expression was detected histochemically in both plant species. The frequency and extent of transformation varied with the type of explant, petioles being the most responsive. The presence of the  vir  inducing substances in the medium influenced the percent explant area transformed but did not appreciably affect the frequency of transformation. The selective proliferation of the transformed tissue and organogenesis was achieved by the culture of explants on MS medium supplemented with antibiotics.

EFFECT OF VIR GENE INDUCERS ON GENETIC TRANSFORMATION FREQUENCIES OF SWEET POTATO AND GARDEN EGG PLANT