COMPARISON OF THE SEEDLING DEVELOPMENT AN D FROST-RESISTANCE OF CEREAL PLANTS GROWN IN LIGHT WITH DIFFERENT SPECTRA

The new plant growth conditions available in the reconstructed Martonv asar phytotron, which differ considerably as regards the spectral comp osition of the light, made it necessary to investigate whether previou sly elaborated phytotronic methods (e.g. for the testing of frost resi stance) could be used unchanged under the present conditions or whethe r modifications were required. The expreiments were designed to trace the frost resistance of winter cereals grown at identical photon flux density provided by fluorescent tubes or metal halide lamps. The exper iments also made it possible to compare the dynamics of seedling devel opment in plants raised in light with different spectra.