Abstract
A hydroponic experiment was conducted to investigate bioaccumulation and photosynthetic activity response to Cd in sweet sorghum seedlings. The seedlings were treated with 0, 50, and 100 μM Cd for 15 d. Our results showed that morphological characteristics of sweet sorghum were significantly affected by Cd treatments. The Cd concentrations in roots and shoots increased with increasing Cd concentrations in the nutrition solution; higher Cd accumulation was observed in the roots. Meanwhile, the photosynthetic activity decreased significantly and a shape of chlorophyll (Chl) a fluorescence transient in leaves was altered by Cd treatments. The Chl contents in the leaves decreased significantly, which was demonstrated by a change of spectral reflectance. Our data indicated that the higher Cd concentration reduced Chl contents and inhibited electron transport in the leaves, leading to the decrease of photosynthetic activity.
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Abbreviations
- ABS/RC:
-
absorption flux per RC
- DIo/RC:
-
dissipated energy flux per RC at t = 0
- DM:
-
dry mass
- E :
-
transpiration rate
- ETo/RC:
-
electron transport flux per RC at t = 0
- FI :
-
fluorescence intensity at the I step (at 30 ms)
- FJ :
-
fluorescence intensity at the J step (at 2 ms)
- Fm :
-
maximal fluorescence intensity
- Fo :
-
fluorescence intensity at 20 μs
- Ft :
-
fluorescence emission from a darkadapted leaf at the time t
- gs:
-
stomatal conductance
- mND705 :
-
modified red-edge normalized difference vegetation index
- Mo :
-
slope of the curve at the origin of the relative variable fluorescence rise
- mSR705 :
-
modified red-edge ratio
- PIabs :
-
performance index
- P N :
-
net photosynthetic rate
- PRI:
-
photochemical reflectance index
- RC:
-
reaction center
- RC/CSo :
-
QA-reducing reaction centers per cross-section
- TF:
-
translocation factor
- TRo/RC:
-
trapped energy flux per RC at t = 0
- Vt :
-
relative variable fluorescence at the time t
- δRo :
-
probability that an electron is transported from the reduced intersystem electron acceptors to the final electron acceptors of PSI
- φPo :
-
maximum quantum yield for primary photochemistry
- ΨEo :
-
probability that an electron moves further than Q –A
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Acknowledgements: This work was supported by the Ministry of Science and Technology of the People's Republic of China under Grant number 2013GS460202-3 of the Science and Technology Program for Public Wellbeing.
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Xue, Z.C., Li, J.H., Li, D.S. et al. Bioaccumulation and photosynthetic activity response of sweet sorghum seedling (Sorghum bicolor L. Moench) to cadmium stress. Photosynthetica 56, 1422–1428 (2018). https://doi.org/10.1007/s11099-018-0835-3
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DOI: https://doi.org/10.1007/s11099-018-0835-3