Study on the Photosynthetic Characteristics of High-yield and Good-quality Hybrid Rice Varieties of Fengliangyou Series during the Late Growth Stage and Its Yield

[Objective] The aim was to study the photosynthetic characteristics of high-yield and good-quality hybrid rice varieties of Fengliangyou series during the late growth stage and its yield,and provide a reference for breeding and cultivating high-yield rice varieties.[Method] The photosynthetic characteristics of there representative Fengliangyou series varieties,Fengliangyou1hao,Fengliangyouxiang1hao and Fengliangyou4hao,were studied taking Shanyou 63 as a control during the late growth stage.And their yield and its components were analyzed.[Result] The grain yield of the three hybrid-rice combinations was 9.7%-19.5% higher than that of Shanyou 63.Compared with Shangyou63,the chlorophyll contents of functional leaves of Fengliangyou series rice varieties during the late growth stage were higher.The net photosynthetic rate of flag leaves was strong.The phenomenon of midday depression of photosynthesis was not obvious.The Superoxide dismutase(SOD) activities of flag leaves were higher and decreased more slowly than that of Shanyou 63,while their Malondialdehyde(MDA) contents were lower and increased more slowly.[Conclusion] Fengliangyou series rice varieties have super high yield potential with strong photosynthetic capability and long high value duration of photosynthetic function.