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  • Author or Editor: T. Erdélyi x
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Nowadays, studying the impact of climate change on agricultural crops is of great importance in national and international projects. Research on the effects of climate change on agricultural cultivars is supported by crop growth models. Simulations provide facilities for the low cost investigation of the effects of many factors, both independently of each other and in combination. These models require parameterisation and testing, which can be done using data measurements. In order to test the correctness of the simulations of meteorological and nutrient supply effects, it is necessary to use the results of long-term field experiments with many replicates.In the present study, the Ceres Wheat and AFRCWHEAT2 winter wheat crop growth models were tested, utilizing the data of a five-year sowing date experiment and the relevant meteorological data. An analysis was made of whether changes in the sowing date were able to influence or eliminate the negative effects of the changing climate. It was found that choosing the optimum sowing date could be the key to adapting to changing conditions.

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The passage of highly specialized germ cells to future generations is essential for the maintenance of species. To date, conventional genetic screens identified relatively few genes that are involved in germ cell development. We aimed to identify germ line specific genes on the X chromosome of Drosophila melanogaster by the application of a new method: the dual-tagging gene-trap system (GT). A modified version of the gene-trap element was used in our experiments and the resulting insertional mutants were screened for grandchild-less phenotype with the help of the attached-X system and a sensitized genetic background developed in our laboratory. Among the 800 insertions mapped to the X chromosome 33 new mutations were identified that exhibited grandchild-less phenotype, 6 gave visible phenotype and 12 were conditional lethal. The cloning of a selected group of the 33 lines showing grandchild-less pheno-type confirmed that we have identified new candidates for genes involved in germ cell development. One of them named pebbled ( peb ) is discussed in details in this paper. Finally, we also describe a novel automatic selection system developed in our laboratory which enables the extension of the GT mutagenesis to the autosomes.

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