Chlorophyll breakdown in senescent banana leaves: catabolism reprogrammed for biosynthesis of persistent blue fluorescent tetrapyrroles.
Bottom Line: Amazingly, in the leaves of banana plants, persistent hmFCCs were identified that accounted for about 80 % of the chlorophyll broken down, and yellow leaves of M. acuminata display a strong blue luminescence.The structures of eight hmFCCs from banana leaves were analyzed by spectroscopic means.As expressed earlier in related studies, the present findings call for attention, as to still elusive biological roles of these linear tetrapyrroles.
Affiliation: Institute of Organic Chemistry & Center for Molecular Biosciences, University of Innsbruck, 6020 Innsbruck (Austria).Show MeSH
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Mentions: Chlorophyll catabolites in senescent banana leaves: In freshly prepared extracts of yellow senescent leaves from bananas (Musa acuminata, Cavendish cultivar, short Ma) about a dozen of blue fluorescent fractions were detected by high performance liquid chromatography (HPLC), all of which were tentatively identified as fluorescent chlorophyll catabolites (FCCs) on the basis of their fluorescence and their absorbance characteristics. Surprisingly, nonfluorescent chlorophyll catabolites (NCCs), the typically more abundant chlorophyll catabolites in leaves, could not be detected in fresh extracts of yellow banana leaves (Figure 2 and the Experimental Section).
Affiliation: Institute of Organic Chemistry & Center for Molecular Biosciences, University of Innsbruck, 6020 Innsbruck (Austria).