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: Quantification of tetrapyrroles in senescent banana leaves: In M. acuminata leaves, freshly harvested at different stages of senescence, the amounts of chlorophylls (a and b) and of fluorescent chlorophyll catabolites (FCCs) were determined quantitatively (Figure 3). For this purpose, green, greenish-yellow, yellow-greenish, shiny yellow and yellow-brownish areas were cut out from different banana leaves and extracted with methanol. Quantitative UV/Vis spectroscopic measurements of the filtered extracts of green leaves and analysis for their chlorophyll content indicated the leaves to contain 61.3(±5.3) nmol cm−2 of chlorophyll a and b (n=3).
Affiliation: Institute of Organic Chemistry & Center for Molecular Biosciences, University of Innsbruck, 6020 Innsbruck (Austria).