中文摘要：

以南粳9108及其亲本为材料,研究在大田栽培条件下优质高产迟熟中粳品种南粳9108在产量形成的关键时期的生长和光合生理指标、光强-光合响应曲线,并在成熟期考察其产量构成因子。结果表明：南粳9108的单株实际产量比亲本均显著提高,比亲本武香粳14提高7.7%,大库和大粒是其高产的重要结构基础。进一步分析生长指标,南粳9108在开花后14 d内具有较大的绿叶面积以及倒三叶的较小叶基角,其群体的光合能力较强;供试材料剑叶开花后14 d光合作用对光强的光合参数分析,南粳9108的光合能力与亲本武香粳14类似,但显著低于亲本关东194;而通过光合作用对光响应的直角双曲线修正模型分析,其对光强更容易饱和,且容易发生光抑制。可见,高产水稻南粳9108具有良好的株型、穗粒结构以及较高的群体光合能力。进一步提高其单叶光合能力,将是其发挥超高产潜力的重要途径。

英文摘要：

A good quality,high yield,slow mature and middle season Japonica rice variety,Nanjing 9108 and its parents Guandong 194 and Wuxiangjing 14,were taken as the materials for the study. The growth and photosynthetic characteristics of the rice plants at the post-flowering stage were compared and the rice yield components were examined at harvest.The results showed that as compared with Wuxiangjing 14,the per plant yield of Nanjing 9108 was 7.70% higher,and much higher than that of Guandong194.The large total grain per plant and heavy grain weight of Nanjing 9108 were the important structure basis for its yield.Further analysis of the growth indicators showed that Nanjing 9108 had a large leaf area of upper three green leaves area and a smaller leaf base angle in the third leaf from the bottom blades,which helped get a higher photosynthetic capacity in groups.On the14 thday after flowering,Nanjing 9108 had similar value of net photosynthetic rate（ Pn）to that of Wuxianjing 14,but lower than that of Guandong 194.Viewing from the parameters obtained from light response of photosynthesis on the modified model of rectangular hyperbola,Pnof Nanjing 9108 was more apt to be saturated by light intensity and sensitive to photoinhibition. On the whole,Nanjing 9108 with high yield mainly resulted from its good plant type,grain structure and higher photosynthetic capacity in groups. Further improving its photosynthetic capacity of single leaf in Nanjing 9108 would be an important way for its super high yield potential in the future.