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Somatic and zygotic embryos share common developmental features at the onset of plant embryogenesis

100%

Leljak-Levanic D. , Mihaljevic S. , Bauer N.

Acta Physiologiae Plantarum

2015

tom 37

nr 07

In many vascular plants, zygotic reproduction regularly alternates with different types of asexual reproduction, so embryos can develop not only from fertilized egg cells, but also from induced somatic cells through the process of somatic embryogenesis. Although somatic and zygotic embryogenesis are not directly correlated, their common features are presented, demonstrating that the origin and development of the somatic embryo morphologically and physiologically resemble zygotic embryogenesis at certain points. To initiate embryogenesis, both competent egg and somatic cells require activation either by fertilization or specific environmental signals, respectively. During induction of somatic and zygotic embryogenesis, modulation of DNA methylation, activation of particular hormonal and stress-related mechanisms and changes in cell wall properties are triggered. Here, we give an overview and discuss the most recent research in the field of plant somatic and zygotic embryogenesis, with special attention given to the onset of embryogenesis and early embryo development as well as to embryogenesisrelated interconnections between plant hormones, stress responses, DNA methylation and regulatory gene expression.

Mapping of mosquito (Culicidae) breeding sites using predictive geographic information methods

88%

Szabo S. , Kenyeres Z. , Bauer N. , Gosztonyi G. , Saringer-Kenyeres T.

Prace Komisji Krajobrazu Kulturowego

2008

tom nr 8

255--270

Application of remote sensing and other GIS methods in the subject of mapping mosquito breeding sites has not been premised accordingly. Despite the facts that the duration of field surveys would be shortened and the effectiveness of action plans would be higher with the supportance of computer modelling techniques. This work aimed to evaluate the applicability of digital elevation models and aerial photographs in the prediction of mosquito breeding sites. Relief analysis was carried out seeking depressions based on elevation models created with TIN and kriging interpolation methods. Spectral analysis was performed on aerial photographs to identify the patches of higher water content or moisture. The results show that terrain analysis can not give acceptable results due to its resolution and accuracy. Spectral analysis of normal (visible range) photographs can be a useful tool in predicting of breeding sites. On grasslands the verificitaion revealed 91% correct results.