The net photosynthetic rates of 132 inbred lines from 14 provinces, cities (autonomous regiones) in China were studied with infrared rays CO2 gas analyzer in the project.

• 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%25？