丰两优系列高产优质杂交水稻品种生育后期光合特性及产量研究

[目的]研究丰两优系列高产优质杂交水稻品种生育后期的光合特性及产量,为高产水稻品种的选育和栽培提供参考。[方法]以汕优63为对照,对丰两优系列的3个代表品种丰两优一号、丰两优香一号和丰两优四号生育后期的光合特性进行研究,并分析其产量及其构成因素。[结果]丰两优系列水稻品种产量比对照高9.7%%～19.5%。丰两优系列水稻品种生育后期功能叶的SPAD较高,剑叶净光合速率强,＂光合午休＂现象较轻,超氧化物歧化酶（SOD）活性高于对照且下降缓慢,丙二醛（MDA）含量较低且上升缓慢。[结论]丰两优系列水稻品种光合能力强且光合功能的高值持续期长,具备超高产的潜力。

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.