کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10879005 | 1076524 | 2014 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Xanthophyll Cycle Pool Size and Composition in Several Cosmarium Strains (Zygnematophyceae, Streptophyta) are Related to their Geographic Distribution Patterns
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کلمات کلیدی
maximum quantum yield of PSIIde-epoxidation staterETRmaxViolaxanthinVDEZEPDDXDTXNPQantheraxanthinPSIIChlDTTFv/Fm - Fv / FmViolaxanthin de-epoxidase - Violaxanthin de-epoksidaseDES - ازDistribution pattern - الگوی توزیعzeaxanthin epoxidase - اکسیداز zeaxanthinPhotosynthetically active radiation - تابش فعال فتوسنتزیPar - توسطMaximum quantum yield - حداکثر عملکرد کوانتومیNon-photochemical quenching - خنک سازی غیر فتوشیمیاییDiadinoxanthin - دیادینوکسانتینdithiothreitol - دیتیوتریتولZeaxanthin - زاکسانتیینChlorophyll - سبزینه یا کلروفیلPhotosystem II - فتوسیستم 2
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The photosynthetic behaviour and composition of photosynthetic pigments of four Cosmarium strains collected from different geographic areas were examined under moderate and photoinhibitory white light by means of PAM fluorometry and high-performance liquid chromatography. Generally, all of the Cosmarium strains displayed the photosynthetic performance and the composition of xanthophyll cycle pigments corresponding to that of high-light adapted plants and algae, when grown under the standard laboratory conditions. However, photoinhibitory treatments provoked several strain- and species-specific characteristics despite the long-term cultivation in laboratory conditions. The typical arctic taxon, C. crenatum var. boldtianum, displayed an incomplete violaxanthin cycle yielding an accumulation of antheraxanthin during high light stress, which is considered as an adaptation to occasional high irradiances in the polar zone due to the albedo. So far, the violaxanthin/antheraxanthin turnover was known only in some prasinophycean algae. Antheraxanthin actively participated in the heat dissipation from PSII centres in C. crenatum, as concluded from a significant positive correlation between non-photochemical quenching (NPQ) and the quantity of antheraxanthin. In contrast, all the other Cosmarium strains displayed a complete violaxanthin de-epoxidase action during the high light treatments, as judged from the relatively high production of zeaxanthin which participated in thermal dissipation of excess energy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Protist - Volume 165, Issue 1, January 2014, Pages 14-30
Journal: Protist - Volume 165, Issue 1, January 2014, Pages 14-30
نویسندگان
Marija StamenkoviÄ, Kai Bischof, Dieter Hanelt,