Comparison of the photodegradation rates of chlorophyll chlorin ring and PHYTOL (cas 150-86-7) side chain in phytodetritus: is the phytyldiol versus PHYTOL (cas 150-86-7) ratio (CPPI) a new biogeochemical index?

Add time:09/28/2019    Source:infona.pl

Rates of photodegradation of chlorophylls in their entirety and of chlorophyll phytyl chains, and time evolution of the Chlorophyll Phytyl side-Chain Photodegradation Index (CPPI) under visible light exposure were determined and compared in laboratory experiments. Killed phytoplanktonic cells of two widespread Bacillariophyceae (Thalassiosira rotula Meun. and Skeletonema costatum (Grev.) Cleve), one widespread Prymnesiophyceae (Emiliania huxleyi (Lohm.) May and Mohler) and one Chlorophyceae (Dunaliella tertiolecta Butch) were used as source of pigments (chlorophyll a, chlorophyll b and phaeophytin a). Chlorophyll and chlorophyll phytyl chain photodegradation and CPPI evolution showed apparent first-order kinetics with respect to light exposure. The in vitro determined degradation rates were approximately 3.5 times higher for the chlorophyll tetrapyrrolic structure than for the phytyl chain. Few variations of the relative photodegradation constant rates were observed between strains: less than 34% for chlorophyll a and 25% for chlorophyll phytyl chain at 20 o C. Nonetheless, the photo-oxidation process of the phytyl chain (Q 1 0 =2.0) seems more affected by temperature than does chlorophyll a (Q 1 0 =1.4). PHYTOL (cas 150-86-7) loss in the dark controls have been attributed to bacterial degradation, and, in the case of S. costatum, chlorophyllase dephytylation seems to have enhanced the potential for bacterial biodegradation. From these results, it clearly appears that in small detrital particles not only chlorophyll a, chlorophyll b and phaeophytin but also their phytyl chains may be rapidly photodegraded in the upper portion of the euphotic zone. The use of the CPPI for monitoring the chlorophyll photo-oxidation process in the aquatic environment is discussed.

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