Photosynthetic properties of erect leaf maize inbred lines as the efficient photo-model in breeding and seed production

Abstract

The initial idea of this study was a hypothesis that erect leaf maize inbred lines were characterized by properties of an efficient photo-model and that as such were very desirable in increasing the number of plants per area unit (plant density) in the process of contemporary selection and seed production. The application of a non-invasive bioluminescence-photosynthetic method, suitable for the efficiency estimation of the photo-model, verified the hypothesis. Obtained photosynthetic properties of observed erect leaf maize inbred lines were based on the effects and characteristics of thermal processes of delayed chlorophyll fluorescence occurring in their thylakoid membranes. The temperature dependence of the delayed chlorophyll fluorescence intensity phase transitions (critical temperatures) in the thylakoid membranes and activation energy are the principal parameters of the thermal processes. Based on obtained photosynthetic properties it is possible to select erect leaf maize inbred lines that are resistant and tolerant to high and very high temperatures, as well as, to drought. They could be good and efficient photo-models wherewith.

Početna ideja za ovaj rad je bila hipoteza da su uspravni listovi samooplodnih linija kukuruza karakteristični za efikasan foto-model i da su kao takvi veoma poželjni u povećanju broja biljaka po jedinici površine (gustina biljaka) u procesima savremenog oplemenjivanja i semenske proizvodnje. Primena neinvazivne bioluminiscencne fotosintetičke metode pogodne za efikasnu ocenu modela, potvrdila je hipotezu. Dobijene fotositetičke karakteristike posmatranih uspravnih listova samooplodnih linija kukuruza su zasnovane na efektu i karakteristikama termalnih procesa odložene fluorescencije hlorofila, koji se pojavljuje na njihovim tilakoidnim membranama. Temperaturna zavisnost intenziteta odložene hlorofilne fluorescencije, fazni prelaz (kritična temperatura) u tilakoidnim membranama i aktivaciona energija su glavni parametri termalnih procesa. Na osnovu dobijenih fotosintetičkih karakteristika, moguće je izabrati samooplodne linije kukuruza uspravnih listova, koje su otporne i tolerantne na visoke i vrlo visoke temperature, kao i na sušu. One mogu biti efikasan fotomodel, za postizanje poboljšanja modernog oplemenjivanja i semenske proizvodnje.