Abstract
Summary In this study we investigated the effect of temperature on phototransformation of photoactive Pchlide into Chlides in etiolated barley leaves ( Hordeum vulgare ). Since the ratio of Pchlide 638 to Pchlide 650 in etiolated barley leaves was changed by heat treatment, it was evident that photoactive Pchlides (Pchlide 638 , Pchlide 650 ) do not show the same sensitivity to heat. Heat treatment at 45 °C decreased the amount of Pchlide 650 , and therefore the main precursor in Chlide synthesis became Pchlide 638 . It has been established earlier that a low-intensity flash may trigger the formation of Chlide 672 as a final stable Chlide species. However, we showed that after heat treatment, a high-intensity flash may also trigger the formation of Chlide 672 instead of the formation of Chlide 684 as observed in etiolated leaves that have not been exposed to heat. We have found that the heat-induced modification changes the pattern of Pchlide phototransformation triggered by light.
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