Impaired leaf CO2 diffusion mediates Cd-induced inhibition of photosynthesis in the Zn/Cd hyperaccumulator Picris divaricata

Bibliographische Detailangaben
Veröffentlicht in:	Plant physiology and biochemistry : PPB. - 1991. - 73(2013) vom: 21. Dez., Seite 70-6
1. Verfasser:	Tang, Lu (VerfasserIn)
Weitere Verfasser:	Ying, Rong-Rong, Jiang, Dan, Zeng, Xiao-Wen, Morel, Jean-Louis, Tang, Ye-Tao, Qiu, Rong-Liang
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2013
Zugriff auf das übergeordnete Werk:	Plant physiology and biochemistry : PPB
Schlagworte:	Journal Article Research Support, Non-U.S. Gov't 2-morpholinoethanesulfonic acid A(N) B(L), D(L), MC(L) and S(L) C(a) and C(i) CA CO(2) mesophyll and stomatal conductances, respectively Cadmium (Cd) Chlorophyll fluorescence mehr... D Diffusional limitation (D(L)) E E(x) F(m) F(o) F(s) F(v)/F(m) MES NPQ P PPFD PSI and PSII Photosynthesis Picris divaricata ROS Stomata V(c,max) biochemical conductance, CO(2) diffusional conductance, mesophyll conductance and stomatal limitations, respectively carbonic anhydrase effective quantum yield of photochemical energy conversion in actinic light efficiency of open PSII centers fraction of absorbed light defines excess energy g(m) and g(s) in vivo maximum rate of Rubisco carboxylation light fraction used for PSII photochemistry light fraction used for heat dissipation maximal fluorescence yield under illumination maximum fluorescence yield maximum quantum efficiency of PSII primary photochemistry minimal fluorescence yield minimal fluorescence yield under illumination net photosynthetic rate non-photochemical quenching photochemical quenching efficient photosynthetic photon flux density photosystem I and photosystem II, respectively q(P) reactive oxygen species reference atmospheric and intercellular CO(2) concentrations steady-state fluorescence transpiration rate Φ(PSII) Photosystem II Protein Complex Cadmium 00BH33GNGH Chlorophyll 1406-65-1 Carbon Dioxide 142M471B3J Zinc J41CSQ7QDS

Beschreibung
Zusammenfassung:	Copyright © 2013. Published by Elsevier Masson SAS. 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
Beschreibung:	Date Completed 29.07.2014 Date Revised 30.09.2020 published: Print-Electronic Citation Status MEDLINE
ISSN:	1873-2690
DOI:	10.1016/j.plaphy.2013.09.008