Identification and isolation of theFEEBLY gene from tomato by transposon tagging
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Abstract
TheAc/Ds transposon system from maize was used for insertional mutagenesis in tomato. Marker genes were employed for the selection of plants carrying a total of 471 uniqueDs elements. Three mutants were obtained withDs insertions closely linked to recessive mutations:feebly (fb), yellow jim (yj) anddopey (dp). Thefb seedlings produced high anthocyanin levels, developed into small fragile plants, and were insensitive to the herbicide phosphinothricin. Theyj plants had yellow leaves as a result of reduced levels of chlorophyll. Thedp mutants completely or partially lacked inflorescences. Thefb andyj loci were genetically linked to theDs donor site on chromosome 3. Reactivation of theDs element in thefb mutants by crosses with anAc-containing line resulted in restoration of the wild-type phenotypes. Plant DNA fragments flanking both sides of theDs element in thefb mutant were isolated by the inverse polymerase chain reaction. Molecular analysis showed that phenotypic reversions offb were correlated with excisions ofDs. DNA sequence analysis ofFb reversion alleles showed the characteristicDs footprints. Northern and cDNA sequence analysis indicated that transcription of theFEEBLY (FB) gene was impeded by the insertion ofDs in an intron. Comparison of the predicted amino acid sequence of the FB protein with other database sequences indicated thatFB is a novel gene.
Key words
Transposon tagging Activator/Dissociation Lycopersicon esculentum MutantsPreview
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