Feb 1, 1991

Embryonic Lethals and T-DNA Insertional Mutagenesis in Arabidopsis

The Plant Cell
D ErrampalliDavid W Meinke

Abstract

T-DNA insertional mutagenesis represents a promising approach to the molecular isolation of genes with essential functions during plant embryo development. We describe in this report the isolation and characterization of 18 mutants of Arabidopsis thaliana defective in embryo development following seed transformation with Agrobacterium tumefaciens. Random T-DNA insertion was expected to result in a high frequency of recessive embryonic lethals because many target genes are required for embryogenesis. The cointegrate Ti plasmid used in these experiments contained the nopaline synthase and neomycin phosphotransferase gene markers. Nopaline assays and resistance to kanamycin were used to estimate the number of functional inserts present in segregating families. Nine families appeared to contain a T-DNA insert either within or adjacent to the mutant gene. Eight families were clearly not tagged with a functional insert and appeared instead to contain mutations induced during the transformation process. DNA gel blot hybridization with internal and right border probes revealed a variety of rearrangements associated with T-DNA insertion. A general strategy is presented to simplify the identification of tagged embryonic mutants and facil...Continue Reading

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Mentioned in this Paper

Embryo
Arabidopsis
Agrobacterium tumefaciens
Nucleic Acid Hybridization Procedure
Embryonic Development
Arabidopsis thaliana extract
Mutant
Nopaline synthase
Plasmids
Arabidopsis thaliana <plant>

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