Abstract
Low temperature during the vegetative stage affects rice (Oryza sativa L.) seed-setting rate in Heilongjiang province at Northeast China. However, little is known about changes of the photosynthetic rate and physiological response in contrasting rice cultivars during chilling periods. In this study, two rice cultivars with different chilling tolerance were treated with 15°C from June 27 to July 7. The chilling-susceptive cultivar, Longjing11 (LJ11), showed a significant decrease in a ripening rate and seed-setting rate after being treated for four days, whilst chilling-tolerant cultivar, Kongyu131 (KY131), was only slightly affected after 4-d treatment. The photosynthetic activities, chlorophyll contents, and antioxidative enzyme activities in LJ11 decreased significantly along with the chilling treatment. The decrease in ß-carotene contents might play a role as it could cause direct photooxidation of chlorophylls and lead to the inhibition of the photosynthetic apparatus. In the meantime, no significant damage was found in leaves of KY131 from June 27 to July 11. In conclusion, the chilling-tolerance mechanism of rice is tightly related to the photosynthetic rate, metabolism of reactive oxygen species, and scavenging system in the vegetative stage.
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Abbreviations
- ABA:
-
abscisic acid
- Chl:
-
chlorophyll
- ETR:
-
electron transport rate
- F0 :
-
minimal fluorescence level in dark-adapted leaves
- F '0 :
-
minimal fluorescence level in light-adapted leaves
- Fm :
-
maximal fluorescence level in dark-adapted leaves
- F 'm :
-
maximal fluorescence level in light-adapted leaves
- Fv :
-
variable fluorescence level in dark-adapted leaves
- F 'v :
-
variable fluorescence level in light-adapted leaves
- Fv/Fm :
-
maximal efficiency of PSII photochemistry
- F 'v /F 'm :
-
efficiency of excitation energy capture by open PSII reaction centers
- KY131:
-
chilling tolerant cv.
- LJ11:
-
chilling-susceptible cv.
- MDA:
-
malondialdehyde
- NBT:
-
nitroblue tetrazolium
- NPQ:
-
nonphotochemical quenching
- POD:
-
peroxidase
- qP:
-
photochemical quenching coefficient
- SOD:
-
superoxide dismutase
- ß-Car:
-
ß-carotene
- ФPSII :
-
actual photochemical efficiency of PSII
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Acknowledgements: This work was supported by National Science and Technology Support Project (2012BAD20B0304).
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Wang, LZ., Wang, LM., Xiang, HT. et al. Relationship of photosynthetic efficiency and seed-setting rate in two contrasting rice cultivars under chilling stress. Photosynthetica 54, 581–588 (2016). https://doi.org/10.1007/s11099-016-0648-1
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DOI: https://doi.org/10.1007/s11099-016-0648-1