Biomedical subjects

Emma Keck

Publications and source records attributed to Emma Keck.

2 recordsLinked to original sources

PubMed2004

Genetic diversity shown in Trichoderma biocontrol isolates.

Genetic variability within 69 biocontrol isolates of Trichoderma, obtained from different geographical locations and culture collections and selected as biocontrol agents, was studied. Sequence data, obtained from the ITS1 region of rDNA and a fragment of the translation elongation factor 1 (tef1) gene, were used in a phylogenetic analysis. Phylograms showing similar topologies were generated using alignments containing the ITS1 region or a portion of the tef1 gene. 21 distinct ITS1 sequence types and 17 distinct tef1 sequence types were identified among the 69 isolates. More than 50% of the potential biocontrol strains were grouped within Trichoderma sect. Pachybasium; of these, 81% were grouped within the cluster that included the ex-type strains of T. harzianum and T. inhamatum, and 16% were grouped with T. virens. Within T. sect. Trichoderma, which included 36% of the 69 strains, 56% were grouped with T. asperellum, and 24% with T. viride, T. atroviride or T. koningii. Only 10% of the strains studied were located in T. sect. Longibrachiatum.

Base Sequence↗

PubMed2003

Separation of genetic functions controlling organ identity in flowers.

Comparative studies on the ABC model of floral development have revealed extensive conservation of B and C class genes, but have failed to identify similar conservation for A class genes. Using a reverse genetic approach, we show that the previous inability to obtain Antirrhinum mutants corresponding to the A class gene AP2 of Arabidopsis reflects greater genetic redundancy in Antirrhinum . Antirrhinum has two genes corresponding to AP2, termed LIP1 and LIP2, both of which need to be inactivated to give a mutant phenotype. Analysis of interactions between LIP and class B/C genes shows that unlike AP2 in Arabidopsis, LIP genes are not required for repression of C in outer whorls of the flower. However, like AP2, LIP genes play a role in sepal, petal and ovule development, although some of their detailed effects are different, reflecting the diverse morphologies of Antirrhinum and Arabidopsis flowers. The dual functions for which AP2 is required in Arabidopsis are therefore separate in Antirrhinum, showing that the genetic basis of some aspects of organ identity have undergone major evolutionary change.

Amino Acid Sequence↗