INFLUENCE OF THE MN(II) AND CH(4) ON THE EVOLUTION OF LIGHT-INDUCED RADICALS IN CHLOROPLASTS

The photochemical activity of the leaves and chloroplasts of several s pecies of plants developed in gaseous hydrocarbon environments (CnH2n2) was investigated by the EPR method. The influence of different conc entrations of paramagnetic ions [Mn(II), Cu(II) and VO(II), respective ly] on the plants grown in dietary media containing these ions was als o followed by EPR spectroscopy. The contents of paramagnetic ions, low er than 0.1%, in the nutritive solutions, are the most suitable in the biosynthesis of chlorophyll-like pigments containing paramagnetic ion s in their porphyrine ring. The changes in the form, structure and pho tosensibility of the EPR signals corresponding to the free radicals, a s well as the properties of the pheophytins containing paramagnetic io ns, such as: Mn(II), Cu(II) and VO(II), were related to the photochemi cal synthesis in gaseous hydrocarbon environments.