Delayed fluorescence of chloroplasts of different genotypes of maize during development at aluminium (Al) stress

Abstract

The Al contamination of soil increased environmental danger in acidified fields. It is known that Al toxicity as a secondary effect can bring to chlorophyll degradation in leaves. At present work different components of millisecond Delayed Light Emission (ms-DLE) of chloroplasts isolated from shoots of two genotypes of maize with different sensitivity to Al ions were analyzed at the different stages of greening at Al20+3 presence. Investigation has shown that Al depress in both genotypes of maize as fast components of ms-DLE reflecting of thylakoid membrane potential as such a slow components of ms-DLE characterizing chemical proton gradient across the thylakoid membrane. Observed blocking more effective at slow components of ms-DLE. The Al effect was less strong and observed significantly later in chloroplasts isolated from more resists genotypes of maize.