Effects of changes in thilakoid membranes - a measure for evaluation of resistance and adaptability of maize inbred lines to high temperature
2001
Radenovic, C.N. (Maize Research Institute Zemun Polje, Belgrade - Zemun (Serbia and Montenegro)) | Babic, M.M. | Delic, N.S. | Ristanovic, D.B.
The chlorophyll delayed fluorescence (DF) method. as a non-invasive bioluminescence method, is recommended for application in maize breeding and seed production in order to evaluate maize inbred lines for resistance and adaptability to increased and high temperatures. The following thermal properties of the photosynthetic apparatus of the studied maize inbred lines have been determined: the temperature dependence within a range of 23-60 deg C; critical temperatures at which phase transitions occur in the thylakoid membrane were established and by means of it significant functional changes in the photosynthetic apparatus of the investigated maize inbred lines were detected. Activation energies (Esub(a), kJ/mol) alongside the straight lines prior and after critical temperatures were calculated. Esub(a) is a measure of occurrence of chlorophyll DF recombination processes and, simultaneously, a measure of total changes in the structure and functioning of thylakoid membranes. Thylakoid membranes in maize inbred lines underwent significant conformational changes in the part following the maximum intensity, i.e. in the part of its sharp linear decline. Such a state fits more a non-living than a living organism in relation to its both, structure and functions. The presented parameters of total thermal processes of chlorophyll DF such as temperature dependence, critical temperatures and activation energy can be an important factor for a more exact characterization of maize inbred lines in relation to their resistance and adaptation to increased and high temperatures, contributing to a more rapid and rational development of the selection process.
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