The ozone layer, which forms a protective envelope around the earth, has been thinning for several decades, leading to an increase in UV-B radiation on a global scale. The increase in UV-B radiation is assumed to have negative effects on crops, which exhibit stress-induced responses at the metabolic level. Finding a solution to this problem, which is now also of concern in Hungary, was thus included in the abiotic stress resistance breeding programme of the Martonvásár institute. For more than ten years a winter nursery has been maintained in the southern hemisphere, in Chile, where the climatic and ecological conditions are approximately the same as those in Hungary, to allow two generations to be raised each year. Some inbred lines have been found to exhibit physiological changes, generally negative, involving flowering asynchrony, barrenness, greater pollen mortality, etc., due to the fact that the UV-B level is higher in Chile (+27% averaged over 3 years). It was thus decided to test the responses of the basic breeding stock grown in Chile in order to set up a selection programme for the development of inbred lines with greater tolerance to higher UV-B radiation. As a first step, leaf samples often inbred lines from the same source, grown under field conditions, were tested for their total anthocyanine content. Averaged over ten lines, three years (2000, 2001, 2002) and two locations (Martonvásár/Hungary, Buin/Chile) it can be said that the higher anthocyanine contents found in the Chilean samples appear to be a response at the metabolic level to the negative stress factor (higher UV-B radiation level). Among the lines tested, the five early maturing lines exhibited an increase in anthocyaninc content averaging over 57% at higher UV-B level. Substantial differences were found between inbred lines with different genotypes and maturity periods as regards their response to UV-B radiation.
|Translated title of the contribution||Changes in the anthocyanine content of maize (Zea mays L.) leaves under increased UV-B radiation|
|Number of pages||12|
|Publication status||Published - Dec 1 2005|
ASJC Scopus subject areas
- Agronomy and Crop Science