کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8886824 | 1628023 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High anthocyanin accumulation in poinsettia leaves is accompanied by thylakoid membrane unstacking, acting as a photoprotective mechanism, to prevent ROS formation
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کلمات کلیدی
FRAPNPQΦPSIINBTPPFDAPXPSImaximum quantum efficiency of PSIIΦNPQDPPHCLSM2,2-diphenyl-1-picrylhydrazyl - 2،2-دی فینیل-1-پریکیل هیدرازیلFv/Fm - Fv / FmROS - ROSnitroblue tetrazolium - tetrazolium nitroblueHydrogen peroxide - آب اکسیژنهPlastoquinone pool - استخر پلاستوکینونTem - این استhigh light - برجستهNon-photochemical quenching - خنک سازی غیر فتوشیمیاییphotochemical quenching of chlorophyll fluorescence - خنک کردن فتوشیمیایی فلورسانس کلروفیلROS scavenging - ریختن ROSSOD - سدSuperoxide dismutase - سوکسوکس دیسموتازPhotoprotection - عکسبرداریPhotoinhibition - عکسبرداریNon-photochemical quenching of chlorophyll fluorescence - غلظت غیر فتوشیمیایی فلورسانس کلروفیلphotosynthetic photon flux density - فتوسنتز تراکم شار فوتونTransmission electron microscopy - میکروسکوپ الکترونی عبوریConfocal laser-scanning microscope - میکروسکوپ کانن کانال لیزر اسکنactinic light - نور فعالlow light - نور کمH2O2 - هیدروژن پراکسیدascorbate peroxidase - پراکسیداز آسکورباتیplastoquinone - پلواستیکینونferric reducing antioxidant power - کاهش قدرت آنتی اکسیدان آهنReactive oxygen species - گونههای فعال اکسیژن
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In poinsettia (Euphorbia pulcherrima Willd. ex Klotzsch.), green leaves turn reddish and then red, due to vacuolar anthocyanin accumulation. Reddish leaves accumulate anthocyanins mainly in the adaxial (upper) epidermis, and less in the mesophyll cells, while red, in both adaxial and abaxial (lower) epidermides, and the adjacent mesophyll cells. In green leaves, the photoprotective mechanism of non-photochemical quenching (NPQ) is sufficient under low light (LL), but not under high light (HL), which results in a more reduced redox state of the plastoquinone (PQ) pool compared to reddish. In red leaves, higher anthocyanin accumulation is accompanied by unstacking of thylakoid membranes that results in loss of photosystem II (PSII) complexes and undetectable hydrogen peroxide (H2O2). Superoxide dismutase (SOD) activity is enhanced in the reddish compared to green leaves, while it decreases significantly in the red ones. Anthocyanin accumulation was significantly correlated to the redox state of the PQ pool and the higher accumulation in reddish compared to green leaves was responsible for the diminished H2O2 production, since ascorbate peroxidase (APX) activity remained unchanged in all leaves. We suggest that H2O2 production regulated by the redox state of the PQ pool induces anthocyanin biosynthesis that is accompanied by thylakoid membrane unstacking and loss of PSII complexes, serving as a photoprotective mechanism to HL, preventing the formation of reactive oxygen species (ROS).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental and Experimental Botany - Volume 154, October 2018, Pages 44-55
Journal: Environmental and Experimental Botany - Volume 154, October 2018, Pages 44-55
نویسندگان
Julietta Moustaka, Emmanuel Panteris, Ioannis-Dimosthenis S. Adamakis, Georgia Tanou, Anastasia Giannakoula, Eleftherios P. Eleftheriou, Michael Moustakas,