GENETIC, BIOPHYSICAL AND BIOCHEMICAL FEATURES OF MAIZE INBRED LINES WITH EFFICIENT PHOTOSYNTHETIC FUNCTIONS

摘要

The results of this study confirm the hypothesis that elite maize inbred lines with erect top leaves share a dominant property of an efficient photosynthetic systems. These inbreds are successfully used in modern breeding programmes and the productionof maize hybrid seeds. Erect position of the top leaves is attended with specific dynamics of grain dry-down during the maturation period, photosynthetic and fluorescence parameters. In particular the changes of the intensity of delayed chlorophyll fluorescence intensity during its course and dynamics, the Arrhenius criterion for the determination of critical temperatures (phase transition temperatures) and the activation energies, as a measure of conformational changes in the thylakoid membranes havebeen revealed. A grain structure including it's physical and chemical parameters was analysed at one time. The presented results show that properties of leading maize inbreds are based on the nature of conformational and functional changes that occur intheir thylakoid membranes and other chemical structures of tissues of grain and intact leaves.