کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8355048 | 1541948 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impaired leaf CO2 diffusion mediates Cd-induced inhibition of photosynthesis in the Zn/Cd hyperaccumulator Picris divaricata
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کلمات کلیدی
photosystem I and photosystem II, respectivelyNPQFv′/Fm′PPFDΦPSIIFm′ - Fm 'Fv/Fm - Fv / FmPSI and PSII - PSI و PSIIROS - ROSStomata - استوماتا2-Morpholinoethanesulfonic acid - اسید 2-مورفولینواتان سولفونیکVc,max - تو، حداکثرminimal fluorescence yield - حداقل عملکرد فلورسانسmaximum fluorescence yield - حداکثر عملکرد فلورسانسNon-photochemical quenching - خنک سازی غیر فتوشیمیاییPhotosynthesis - فتوسنتزphotosynthetic photon flux density - فتوسنتز تراکم شار فوتونSteady-state fluorescence - فلورسانس حالت پایدارChlorophyll fluorescence - فلورسانس کلروفیلFo′ - فوMeS - مسtranspiration rate - نرخ تنفسnet photosynthetic rate - نرخ فتوسنتزی خالصCadmium (Cd) - کادمیوم (Cd)Carbonic anhydrase - کربونیک آنهیدرازReactive oxygen species - گونههای فعال اکسیژن
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Mechanisms of cadmium (Cd)-induced inhibition of photosynthesis in the Zn/Cd hyperaccumulator Picris divaricata were investigated using photosynthesis limitation analysis. P. divaricata seedlings were grown in nutrient solution containing 0, 5, 10, 25, 50, or 75 μM Cd for 2 weeks. Total limitations to photosynthesis (TL) increased from 0% at 5 μM Cd to 68.8% at 75 μM Cd. CO2 diffusional limitation (DL) made the largest contribution to TL, accounting for 93-98% of TL in the three highest Cd treatments, compared to just 2-7% of TL attributable to biochemical limitation (BL). Microscopic imaging revealed significantly decreased stomatal density and mesophyll thickness in the three highest Cd treatments. Chlorophyll fluorescence parameters related to photosynthetic biochemistry (Fv/Fm, NPQ, ΦPSII, and qP) were not significantly decreased by increased Cd supply. Our results suggest that increased DL in leaves is the main cause of Cd-induced inhibition of photosynthesis in P. divaricata, possibly due to suppressed function of mesophyll and stomata. Analysis of chlorophyll fluorescence showed that Cd supply had little effect on photochemistry parameters, suggesting that the PSII reaction centers are not a main target of Cd inhibition of photosynthesis in P. divaricata.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Physiology and Biochemistry - Volume 73, December 2013, Pages 70-76
Journal: Plant Physiology and Biochemistry - Volume 73, December 2013, Pages 70-76
نویسندگان
Lu Tang, Rong-Rong Ying, Dan Jiang, Xiao-Wen Zeng, Jean-Louis Morel, Ye-Tao Tang, Rong-Liang Qiu,