Abstract
The influence of various concentrations of imazapic residues (0–800 μg kg–1) on the growth, chlorophyll content, and photosynthetic characteristics of maize seedlings was studied in a greenhouse pot experiment. Plant height, root length, shoot dry mass, root dry mass, and total dry mass of maize declined with the increase of imazapic residue concentrations. The root/shoot ratio initially decreased and then increased in presence of imazapic, which indicated that the effects of imazapic residues on plant height and root length might differ in maize seedlings. Lowered chlorophyll content and net photosynthetic rate were observed in leaves of maize seedlings in all treatments and indicated a dose-response relationship to imazapic concentrations. Intercellular carbon dioxide concentration, transpiration rate, and stomatal conductance also declined to varying extents, but the chlorophyll a/b ratio increased gradually together with the increase of imazapic residue concentrations. Generally, the maize seedlings were negatively affected by the imazapic residues in soil. Response of root length and biomass to imazapic residues could be the important index for maize variety selection.
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Abbreviations
- ALS:
-
acetolactate synthase
- Car:
-
carotenoids
- Chl:
-
chlorophyll
- C i :
-
intercellular CO2 concentration
- DM:
-
dry mass
- E :
-
transpiration rate
- FM:
-
fresh mass
- Fv/Fm :
-
maximum photochemical efficiency of PSII
- g s :
-
stomatal conductance
- PHT:
-
plant height
- P N :
-
net photosynthetic rate
- RDM:
-
root dry mass
- RL:
-
root length
- SDM:
-
shoot dry mass
- TDM:
-
total dry mass
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Acknowledgements: This work was supported by the Special Fund for Agro-scientific Research in the Public Interest (201203098). The authors thank editors and anonymous reviewers for their valuable comments.
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Su, W.C., Sun, L.L., Wu, R.H. et al. Effect of imazapic residues on photosynthetic traits and chlorophyll fluorescence of maize seedlings. Photosynthetica 55, 294–300 (2017). https://doi.org/10.1007/s11099-016-0641-3
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DOI: https://doi.org/10.1007/s11099-016-0641-3