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- Title
THE EFFECTS OF CD<sup>2+</sup> STRESS ON PHOTOSYSTEM Ⅱ FUNCTIONING OF RICE (ORYZA SATIVA L.) LEAVES UNDER ELEVATED CO<sub>2 </sub>LEVEL.
- Authors
M., LI; X F., QI; X. H., WANG; Y. Y., LI; L. J., MA; X. M., LI; L, WANG L.
- Abstract
The effects of elevated levels of CO2 (EC) and cadmium (Cd2+) on the photosystem II of rice leaves were studied using fast chlorophyll fluorescence technique. Rice seedlings (two-leaves-stage) were treated under atmospheric CO2 (AC, 400 μmol/mol) and elevated CO2 (EC, 800 μmol/mol), while applied 0, 50, 150, 250 and 500 μmol/L Cd2+ concentrations respectively. Chlorophyll fluorescence parameters were measured after six days treatments. The results showed that: (1) Under Cd2+, FV/F0, φPo, Ψo, φEo and PIABS decreased significantly, while VK, VJ, WK, M0, φDo, ABS/RC, TR0/RC, DI0/RC increased significantly compared to AC. Additional effects were found on the donor side, reaction centers and acceptor side under Cd2+, which caused a lower energy connectivity, reduction of PSⅡ activity and electron transfer efficiency as well as an increase of heat dissipation. (2) EC significantly increased FV/F0, φPo, Ψo, φEo and PIABS, while significantly decreased VJ and φDo compared to AC. EC increased the photo-energy conversion efficiency of PSⅡ. (3) Under EC and Cd2+ treatments, the adverse effects of Cd2+ were slightly alleviated by EC in EC 50 (EC + 50 μmol/L Cd2+, the following abbreviations are consistent with this), but the negative influence on photosystem Ⅱ was still the most significant
- Subjects
PHOTOSYSTEMS; CHLOROPHYLL spectra; CHARGE exchange; QUANTUM efficiency; CADMIUM poisoning; FLUX (Energy)
- Publication
Applied Ecology & Environmental Research, 2021, Vol 19, Issue 1, p739
- ISSN
1589-1623
- Publication type
Article
- DOI
10.15666/aeer/1901_739750