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群体叶片截获光能能力的叶面积指数（ＬＡＩ）的发展和单个叶片光能转化效率的最大光合速率（Ｐｍ ａｘ），是提高水稻光能利用效率的两大关键性的指标．利用适应低光强生态型的、ＬＡＩ发展快的广东优良品种“七桂早”，与适应高光强生态型的、Ｐｍ ａｘ 高的美国优良品种“Ｌｅｍ ｏｎｔ”为亲本，利用化学杂交剂组配成化杀杂种稻Ｌｅ／七，较好地解决了ＬＡＩ与Ｐｍａｘ的矛盾．Ｌｅ／七既保持了父本“七桂早”早期ＬＡＩ发展快的优点，又兼具有母本“Ｌｅｍ ｏｎｔ”Ｐｍａｘ较高、适应高光强的优点．杂种Ｌｅ／七在中午强光下光合作用“午睡”现象不明显，尤其是当广东出现造成水稻光氧化伤害的气象条件时，Ｌｅ／七的光氧化伤害很轻或无，比“七桂早”明显提高了对高光强的光能利用效率．对杂种Ｌｅ／七在人工气候箱不同控光控温条件下进行的生长分析，及在平原、丘陵及山区的试种，均表明其光合生产力和光合适应性比亲本有明显的提高和改进．研究表明∶利用美国适高光强的优良品种，通过组配成化杀杂种稻的途径，是改良广东水稻品种对高光强的光合适应性，提高光合生产力和经济效益的一条快速而有效的育种途径．
The development of LAI and the maximum photosynthetic rate (Pm ax) of leaf energy conversion efficiency of single leaf were the two key indexes to improve the light utilization efficiency of rice. Using the “Qi Gu Zao”, an elite Guangdong variety with low light intensity and high LAI, was used as the parent of “Lem ont”, a high-yielding American cultivar “Lem ont” To kill hybrid rice Le / seven, a better solution to the contradiction between LAI and Pmax. Le / 7 not only maintained the advantage of rapid development of LAI in the early stage of Qi Guizao, but also had the advantage of higher Pmax and higher light intensity in female parent Lem ont. Hybrid Le / VII photosynthesis at noon light “nap” phenomenon is not obvious, especially when Guangdong weather conditions that cause photooxidative damage in rice, Le / seven of light-induced oxidative damage is very light or no, than “Qi Guizao ”Significantly increased the use of high light energy efficiency. The growth analysis of the hybrid Le / 7 under different light and temperature control conditions in the artificial climate chamber, and the trial planting in the plains, hills and mountains showed that their photosynthetic productivity and photosynthetic adaptability were significantly improved and improved than the parents. The research shows that it is a fast and effective breeding way to improve the photosynthetic adaptability of Guangzhong rice to high light intensity and improve photosynthetic productivity and economic benefits through the combination of elite varieties with high light intensity in the United States through the combination of maize and hybrid rice.