Abstract
Water is a limited resource and is likely to become even more restricted with climate change. The aim of this study was to evaluate the effect of humic acid (HA) applications on photosynthesis efficiency of rapeseed plants under different watering conditions. Water stress strongly increased electron transport flux, probability that trapped excitation can move an electron into the electron transport chain beyond QA, and quantum yield of reduction of end electron acceptors at the PSI acceptor side. Application of HA decreased the values of these parameters to be similar to those of non-stress conditions. We found that, the application of HA improved plants net photosynthesis under water stress via increasing the rate of gas exchange and electron transport flux in plants.
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Abbreviations
- ABS/RC:
-
absorption flux per reaction center
- CCI:
-
chlorophyll content index
- ChlF:
-
chlorophyll a fluorescence
- DI0/RC:
-
dissipation energy flux per RC
- ETC:
-
electron transfer chain
- ET0/RC:
-
maximum electron transport flux per RC
- F0 ~ F20μs :
-
minimum fluorescence intensity at 20 μs
- Fm :
-
maximum fluorescence intensity at P-step (~300 ms)
- Fv :
-
variable fluorescence
- Fv/F0 :
-
a value that is proportional to the activity of the water-splitting complex on the donor side of PSII
- Fv/Fm :
-
maximum quantum yield of PSII photochemistry
- g s :
-
stomatal conductance
- HA:
-
humic acid
- KN :
-
the nonphotochemical de-excitation rate constant in the excited antennae for non-photochemistry
- KP :
-
the photochemical de-excitation rate constant in the excited antennae of energy fluxes for photochemistry
- MWS:
-
moderate water stress
- OEC:
-
oxygen-evolving complex
- OJIP:
-
transient-fluorescence induction defined by the names of its intermediate steps
- PItotal :
-
performance index
- P N :
-
net photosynthetic rate
- Sm :
-
representing energy necessary for the closure of all reaction centers
- SWS:
-
severe water stress
- TR0/RC:
-
trapped energy flux per RC
- VJ :
-
relative variable florescence at J-step (2 ms)
- VI :
-
relative variable florescence at I-step (30 ms)
- WWC:
-
well watering condition
- ѱE0 :
-
probability that trapped excitation moves an electron into the electron transport chain beyond QA-
- φR0 :
-
quantum yield of reduction of end electron acceptors at the PSI acceptor side
- δR0 :
-
probability with which an electron from the intersystem electron carriers move to reduce end electron acceptors at the PSI acceptor side
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Lotfi, R., Kalaji, H.M., Valizadeh, G.R. et al. Effects of humic acid on photosynthetic efficiency of rapeseed plants growing under different watering conditions. Photosynthetica 56, 962–970 (2018). https://doi.org/10.1007/s11099-017-0745-9
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DOI: https://doi.org/10.1007/s11099-017-0745-9