This study confirms the hypothesis that new and prospective maize inbred lines and hybrids possess dominant property of an efficient photosynthetic model. This and other relevant traits are successfully used in breeding programmes, modern technologies of seed and commercial maize production. This statement is supported by the displayed results on the erect position of the top leaves of new maize inbred lines and photosynthetic and fluorescence parameters: the change of the 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 chloroplasts and thylakoid membranes. Furthermore, a grain structure including its physical and chemical properties of new maize inbred lines and hybrids was analyzed in the present study. In addition, breeding procedures, seed production, technological traits, properties and parameters of new and prospective maize inbred lines and maize hybrids were observed in the present study. Presented results show that properties of these inbred lines and maize hybrids are based on the nature of conformational and functional changes that occur in their chloroplasts and thylakoid membranes, as well as, on progressive effects in maize breeding, seed production and commercial maize production.

Breeding and selection of inbred lines ZPPL 146 and ZPPL 159 and hybrids developed from them (ZP 633, ZP 735 and ZP 737, primarily intended for feed) have been carried out for almost three decades. These inbred lines and hybrids have high nutritive values, they are rich in pigment properties, have efficient photosynthesis and other relevant parameters characteristic for standard hybrids. Observed maize hybrids are very important as carbohydrate rich nutrients. Feed produced from these hybrids is of high productivity and high quality. Due to their high productivity of total dry matter per area unit, these hybrids represent one of the most important forage products. Moreover, the study presents the importance of the chemical composition of maize hybrid grain in essential biogenic substances particularly pigments that have antioxidant properties.