Influence of Enhanced UV-B Radiation on Chlorophyll Fluorescence Characteristics of Rice

doi:10.7668/hbnxb.2014.02.027

Abstract

Abstract: It was used to investigate the contents of photosynthetic pigment and the characteristics of chloro- phyll fluorescence kinetics parameters in the different growth stages of rice(Shennong 265) at different treatments (UV radiation intensity increased by 5% and 10% respectively), compared with natural lighting. Results showed that the contents of chlorophyll-a and chlorophyll-b were diminished significantly in the jointing stage. The content of chlorophyll-a was diminished by 13. 87% and 23. 30% respectively. The content of chlorophyll-b was diminished by 10. 76% and 17. 70% respectively. The contents of carotenoids were increased by 21. 55% and 31. 02% respec- tively, especially in the heading stage. The intrinsic photochemical efficiency (F_v/F_m) of two treatments was dimin- ished by 4. 4% and 7. 83% respectively in the filling stage, and the potential activities (F_v/F_o) were diminished by 9. 02% and 17. 03% respectively. Decreasing amplitude of effective quantum yield (Φ_PSⅡ ) in the heading stage was higher than other stages, but there had no significant difference between treatments (P < 0. 05) . Photochemical quenching (qP) reduced significantly in the two treatments, and the influence was waning with growth process. Non- photochemical quenching (NPQ) of T1 increased significantly, yet NPQ of T2 reduced significantly.

Key words: Rice, UV-B, Chlorophyll, Fluorescence parameters

CLC Number:

S511.01

QIAO Yuan, YIN Hong, LI Hu, YANG Zhen-xing, GAO Min. Influence of Enhanced UV-B Radiation on Chlorophyll Fluorescence Characteristics of Rice[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(2): 146-151. doi: 10.7668/hbnxb.2014.02.027.

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