[Photooxidation characteristics of super-hybrid rice "Liangyoupeijiu" and its parents].

With comparison of the differences of light absorption and active oxygen metabolism between super-hybrid rice "Liangyoupeijiu" and its parents, this paper provided a physiological foundation of matching and grouping for cultivating anti-photooxidized hybrid rice. TPS-photosynthetic system and FMS2-fluorescence (Hansatech, UK) were used to respectively determine the photosynthetic rate and the chlorophyll fluorescence in the rice leaves that had been processed in artificial photooxidization. Meanwhile, the contents of chlorophyll, protein and malonaldehydic acid (MDA) as well as the activation of superoxide dismutase (SOD) and peroxidase (POD) were determined. The results showed that the photosynthetic rate of "Liangyoupeijiu" was 2.4% lower than that of its female parent, and 23% higher than that of its male parent. After eight days anti-photooxidization process, its chlorophyll content was higher than that of its female parent by 33%, protein by 15%, initial photochemical efficiency by 30%, SOD by 32% and POD by 100%, while its photochemical quince coefficient was lower than that of its female parent by 9% and MDA by 50%. It showed that there was not much difference between the filial generation and its male parent. The super-hybrid rice "Liangyoupeijiu" was very efficient for solar energy utilization under the condition of photooxidization, and had outgrown its parents in the aspect of anti-photooxidization.