کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9485697 | 1329283 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
UV-B-induced compounds as affected by proline and NaCl in Hordeum vulgare L. cv. Alfa
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کلمات کلیدی
UV-B absorbing compoundsTCAUV-BPPFDChltrichloracetic acid - اسید تریکلراکتیکAOS - بهoxygen evolution - تکامل اکسیژنHordeum vulgare - ذرتPhotochemical quenching - رفع عکس شیمیاییChlorophyll - سبزینه یا کلروفیلnon-photochemical fluorescence quenching - غلظت فلورسنت غیر فتوشیمیاییphotosynthetic photon flux density - فتوسنتز تراکم شار فوتونFlavonoids - فلاونوئیدهاChlorophyll fluorescence - فلورسانس کلروفیلvariable chlorophyll fluorescence - فلورسانس کلروفیل متغیرactive oxygen species - گونه های اکسیژن فعال
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: UV-B-induced compounds as affected by proline and NaCl in Hordeum vulgare L. cv. Alfa UV-B-induced compounds as affected by proline and NaCl in Hordeum vulgare L. cv. Alfa](/preview/png/9485697.png)
چکیده انگلیسی
From the leaves of barley seedlings (Hordeum vulgare L. cv. Alfa) UV-B induced compounds, with maximum absorbance at 438Â nm (A438) were extracted. The relationship between the level of UV-B induced compounds and UV-B tolerance of barley seedlings was investigated. The level of these compounds depended on the time of UV-B irradiation. They increased 4Â h after UV-B treatment, reached maximum after 24Â h and then declined. Contrary, the syntheses of UV-absorbing compounds extracted in acidified methanol continued for a long period after UV exposure and after 120Â h the values of A300 are higher. The content of UV-induced compounds enhanced in the plants treated with proline before UV-B irradiation and decreased as a result of NaCl pretreatment in a concentration depending manner. A physiological response to UV-B irradiation was evaluated by measuring the oxygen evolution rate, chlorophyll fluorescence and chlorophyll/carotenoids ratio. No correlation was found between the level of A438 and UV-B tolerance of barley seedlings. It is possible these compounds to play a subtle role in plant UV-B protection than simple UV-B screening or to serve as stress markers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental and Experimental Botany - Volume 54, Issue 2, September 2005, Pages 182-191
Journal: Environmental and Experimental Botany - Volume 54, Issue 2, September 2005, Pages 182-191
نویسندگان
Ivanka Fedina, Maya Velitchkova, Katya Georgieva, Irena Grigorova,