Effect of elevated CO2 concentration on photosynthetic characteristics of hyperaccumulator Sedum alfredii under cadmium stress. Issue 7 (29th January 2015)

• Record Type: Journal Article
• Authors: Li, Tingqiang; Tao, Qi; Di, Zhenzhen; Lu, Fan; Yang, Xiaoe
• Is Part Of: Journal of integrative plant biology. Volume 57:Issue 7(2015)
• Page Start: 653
• Page End: 660
• Publication Date: 2015-01-29
• Subjects: Plants -- Periodicals; Plants -- China -- Periodicals; Electronic journals; 580.5
• DOI: 10.1111/jipb.12307
• Languages: English
• ISSNs: 1672-9072

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="jipb12307-sec-0001" sec-type="section"> <p>The combined effects of elevated CO<sub>2</sub> and cadmium (Cd) on photosynthetic rate, chlorophyll fluorescence and Cd accumulation in hyperaccumulator <italic>Sedum alfredii</italic> Hance were investigated to predict plant growth under Cd stress with rising atmospheric CO<sub>2</sub> concentration. Both pot and hydroponic experiments were conducted and the plants were grown under ambient (350 µL L<sup>−1</sup>) or elevated (800 µL L<sup>−1</sup>) CO<sub>2</sub>. Elevated CO<sub>2</sub> significantly (<italic>P < </italic>0.05) increased Pn (105%–149%), Pn<sub>max</sub> (38.8%–63.0%) and AQY (20.0%–34.8%) of <italic>S</italic>. <italic>alfredii</italic> in all the Cd treatments, but reduced chlorophyll concentration, dark respiration and photorespiration. After 10 days growth in medium with 50 µM Cd under elevated CO<sub>2</sub>, PSII activities were significantly enhanced (<italic>P < </italic>0.05) with Pm, Fv/Fm, Φ(II) and qP increased by 66.1%, 7.5%, 19.5% and 16.4%, respectively, as compared with ambient‐grown plants. Total Cd uptake in shoot of <italic>S. alfredii</italic> grown under elevated CO<sub>2</sub> was increased by 44.1%–48.5%, which was positively correlated with the increase in Pn. These results indicate that elevated CO<sub>2</sub> promoted the growth of <italic>S. alfredii</italic> due to increased photosynthetic carbon uptake rate and photosynthetic light‐use efficiency, and showed great potential to improve the phytoextraction of Cd by <italic>S. alfredii</italic>.</p> </sec> </abstract>