Traits of new maize inbred lines and hybrids with efficient photosynthetic functions

Abstract

This study confirms the hypothesis that there are new elite maize inbred lines and prospective hybrids, which have a dominant property of an efficient photosynthetic model that is successfully used in breeding programmes, modern technologies of the 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 florescence 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 the thylakoid membrane. Furthermore, a grain structure, including its physical and chemical parameters, of new maize inbred lines was analysed in the present study. Also, relevant breeding, seed production and technological traits, properties and parameters of new inbred lines and prospective maize hybrids were observed in the present study. The presented results show that properties of new inbred lines and prospective 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, modern hybrid seed production and the commercial maize production.

U ovom radu vršena su proučavanja novih elitnih inbred linija kukuruza: ZPPL 218 i ZPPL 318 i perspektivnih hibrida kukuruza ZP 600, ZP 606 i ZP 666 stvorenih iz njih. Pokazano je da se potvrđuje naša hipoteza da nove elitne inbred linije i perspektivni hibridi kukuruza poseduju dominantno svojstvo efikasnog fotosintetičnog modela što se uspešno koristi u oplemenjivanju, savremenim tehnologijama proizvodnje hibridnog semena i merkantilnog kukuruza. Ovoj konstataciji idu u prilog izloženi rezultati o uspravnom položaju vršnih listova novih inbred linija kukuruza i o fotosintetički-fluorescentnim pokazateljima: promeni intenziteta zakasnele fluorescencije hlorofila u njenom toku i dinamici, Arenijusovom kriterijumu za određivanje kritičnih temperature (temperature faznih prelaza) i o energiji aktivacije kao meri strukturnih promena u hloroplastima i tilakoidnoj membrani. U radu se analiziraju struktura zrna uključujući i njegove fizičke i hemijske pokazatelje novih inbred linija kukuruza. Isto tako, u radu se razmatraju relevantna selekcionarska, semenarska i tehnološka svojstva, karakteristike i parametri novih inbred linija i perspektivnih hibrida kukuruza. Ukupno izloženi rezultati pokazuju da su svojstva novih inbred linija i perspektivnih hibrida kukuruza, zasnovana na prirodi strukturnih i funkcionalnih promena koje se odigravaju u hloroplastima i tilakoidnim membranama, kao i na progresivnim efektima u oplemenjivanju, savremenoj proizvodnji hibridnog semena i merkatilnog kukuruza.