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对我国１４个省、市（区）１３２份玉米自交系资源叶片光合特性的研究表明，在同一测定条件下自交系内各单株光合速率的变异系数集中在３％～１８％，而自交系间的为２４．７３％，经方差分析玉米自交系间光合速率存在极显著差异。我国目前常用１３２份自交系光合速率（ＣＯ２）平均值为２６．６６μｍｏｌ／（ｍ２ｓ），变幅在４０．８０～１０．４８μｍｏｌ／（ｍ２ｓ），呈偏常态分布。１３２份自交系可明显地被聚成光合速率高、较高、中等和低４种类群，并以光合速率中等（占４７．０％）和较高（占３１．１％）两种类群为主。光合速率高的自交系为沈１３７、多０５、武ＴＰ、Ｔ１／Ｒｍｏ１７Ｏ２、中群１４、１１－４３、多１８－１５、５００５、多９１１６、金黄９８和中系０４２，是一组光合生理育种利用价值高的特异种质资源材料。此外，玉米自交系在典型高产区（河北万全）比在北京表现出光合速率绝对值高（３１．３０％）和种间差异小的趋势。
Studies on the leaf photosynthetic characteristics of 132 maize inbred lines in 14 provinces and cities in China showed that the coefficient of variation of photosynthetic rate of all the inbred lines was 3% ~ 18% There was a significant difference in photosynthetic rate between maize inbred lines by analysis of variance. The average photosynthetic rate (CO2) of 132 inbred lines in our country is 26.66μmol / (m2s) at the average amplitude of 40.80 ~ 10.48μmol / (m2s), showing a normal distribution. 132 inbred lines could be apparently clustered into four groups with high photosynthetic rate, high, medium and low photosynthesis, with the photosynthetic rate of medium (47.0%) and high (31.1%) Mainly. Inbred lines with high photosynthetic rate were Shen 137, Wu 05, Wu TP, T1 / Rmo17O2, Zhongnun 14,11-43, Much 18-15,5005, Much 9116, Jin 98 and Zhong 042, Physiological breeding use of high value-specific germplasm resources. In addition, maize inbred lines showed a higher absolute value of photosynthetic rate (31.30%) and a lower interspecific difference in typical high-yielding areas (Hebei Wanquan) than in Beijing.