کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1942658 1052622 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chlorophyll breakdown in higher plants
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Chlorophyll breakdown in higher plants
چکیده انگلیسی

Chlorophyll breakdown is an important catabolic process of leaf senescence and fruit ripening. Structure elucidation of colorless linear tetrapyrroles as (final) breakdown products of chlorophyll was crucial for the recent delineation of a chlorophyll breakdown pathway which is highly conserved in land plants. Pheophorbide a oxygenase is the key enzyme responsible for opening of the chlorin macrocycle of pheophorbide a characteristic to all further breakdown products. Degradation of chlorophyll was rationalized by the need of a senescing cell to detoxify the potentially phototoxic pigment, yet recent investigations in leaves and fruits indicate that chlorophyll catabolites could have physiological roles. This review updates structural information of chlorophyll catabolites and the biochemical reactions involved in their formation, and discusses the significance of chlorophyll breakdown. This article is part of a Special Issue entitled: Regulation of Electron Transport in Chloroplasts.

Research Highlights
► Chlorophyll is broken down in a multi-step pathway called PAO pathway.
► The PAO pathway operates during leaf senescence and fruit ripening.
► The end products of the pathway are fluorescent and nonfluorescent catabolites.
► The pathway aims to detoxify chlorophyll, but may also have physiological roles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1807, Issue 8, August 2011, Pages 977–988
نویسندگان
, ,