Photosynthetica 2016, 54(4):581-588 | DOI: 10.1007/s11099-016-0648-1

Relationship of photosynthetic efficiency and seed-setting rate in two contrasting rice cultivars under chilling stress

L. Z. Wang1, L. M. Wang1, H. T. Xiang1, Y. Luo1, R. Li1, Z. J. Li1, C. Y. Wang1, Y. Meng1,*
1 Crop Tillage and Cultivation Institute, Heilongjiang Academy of Agricultural Sciences, Harbin Heilongjiang, China

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.

Additional key words: abscisic acid; chlorophyll fluorescence; malondialdehyde; peroxidase; proline; superoxide dismutase

Received: October 30, 2015; Accepted: May 13, 2016; Published: December 1, 2016  Show citation

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Wang, L.Z., Wang, L.M., Xiang, H.T., Luo, Y., Li, R., Li, Z.J., Wang, C.Y., & Meng, Y. (2016). Relationship of photosynthetic efficiency and seed-setting rate in two contrasting rice cultivars under chilling stress. Photosynthetica54(4), 581-588. doi: 10.1007/s11099-016-0648-1
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