The development of efficient gene vector systems and various genetic transformation techniques has catalyzed rapid progress in plant genetic 421 0066-4197/8811215-0421$2.00 WEISING, SCHELL & KAHL engineering over the past five years. Stable integration and expression of foreign genes in many dicotyledonous and a few monocotyledonous plants is now routine. As a result, plant gene research is witnessing a burst of new data that need critical evaluation. This review examines new insights into natural plant engineering via the Ti plasmid of Agrobacterium tumefaciens, Ti plasÂ mid-derived plant gene vectors, transformation techniques, the structure and expression of genes in their transgenic environment, and it briefly discusses the impact of plant genetic engineering for basic gene research, as well as for crop improvement. The reader should also consult three other recent surveys of the topic (112 , 184, 281) . NATURAL PLANT ENGINEERING VIA THE TI PLASMID OF AGROBACTERIUM TUMEFACIENS Virulent strains of Agrobacterium tumefaciens (Rhizobiaceae) are characterÂ ized by the presence of a large plasmid (Ti plasmid , > 150 kb; 353). These bacteria induce neoplastic growth on most dicots and gymnosperms (77), but also on a few monocots (45 , 1 30, 1 49, 280) where it results in
Annual Review of Genetics – Annual Reviews
Published: Dec 1, 1988
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