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- W1563807157 abstract "During plant senescence, chlorophyll (Chi) is degraded to non-fluorescent Chi catabolites (NCCs; Fig. la). These linear tetrapyrroles accumulate in the vacuoles of senescing cells and, in many plant species, represent the final products of Chi catabolism (Matile et al. 1988; Krautler 2003). Despite the billions of tons of Chi dis appearing this way every year and the fascinating autumnal color change of deciduous trees resulting from it, most reactions underlying conversion of Chi to NCC have only recently been elucidated (for recent reviews, see Hortensteiner 1999; Takamiya et al. 2000; Krautler 2003). Chi breakdown is a multi-step pathway (Fig. la) aiming to increase pigment solubility and to abolish the photodynamic properties of Chi by complete disruption of the conjugated 7i-electron system. Taking this into account, Chi breakdown can be apostrophized as Chi detoxification (Hortensteiner 1999). As inferred from the structures of NCCs (Krautler et al. 1991), the most remarkable structural change is the oxygenolytic opening of the porphyrin macrocycle of Chi. This reaction is catalyzed by the joint action of two enzymes, pheophorbide a oxygenase (PaO) and red Chi catabolite reductase (RCCR) converting pheophorbide (pheide) a to a primary fluorescent Chi catabolite (pFCC; Fig. la; Rodoni et al. 1997a). Several lines of evidence suggest that the two enzymes interact during catalysis, thereby channeling the first porphyrin cleavage" @default.
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- W1563807157 date "2004-06-01" @default.
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- W1563807157 title "The loss of green color during chlorophyll degradation?a prerequisite to prevent cell death?" @default.
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- W1563807157 doi "https://doi.org/10.1007/s00425-004-1231-8" @default.
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