title: In vitro transformation of petunia cells by an improved method of co-cultivation with A. tumefaciens strains.
abstract: A method (termed co-cultivation) for transforming plant cells in vitro with A. tumefaciens strains, which was originally developed by Marton et al. (1978) Nature 277: 129-131, has been modified by the incorporation of a novel feeder plate culture system and been extended to use with petunia protoplasts. Using efficient cell plating and selection conditions for phytohormone-independent growth, large numbers of independent transformed calli can be obtained efficiently (∼10(-1)) and in less than 3 weeks following protoplast isolation. Southern hybridization analysis has confirmed that the majority of the resulting in vitro transformants contain a single copy of full length T-DNA.The high efficiency of this procedure allows simple screening to identify plant cells transformed by Ti plasmids attenuated by deletion of internal T-DNA regions. Results are presented that demonstrate the co-cultivation method can be used in conjunction with short term assays for monitoring plant gene expression.
authors: Monsanto Corporate Research & Development Staff, Biological Sciences, 800 N. Lindbergh, 63167, St. Louis, MO, U.S.A..
authors: R T
authors: RT
authors: Fraley
authors: R B
authors: RB
authors: Horsch
authors: A
authors: A
authors: Matzke
authors: M D
authors: MD
authors: Chilton
authors: W S
authors: WS
authors: Chilton
authors: P R
authors: PR
authors: Sanders