The leaf anatomy, photosynthetic system parameters and accumulation of carbohydrates were determined at different times for Bipolaris oryzae pathogenesis in two rice cultivars (BRS Querência and Inov CL), grown in an environment with 400 ppm or 700 ppm of atmospheric CO₂. The results demonstrated that the plants exposed to 700 ppm underwent changes in anatomical characteristics (reduction in parenchyma thickness and size of bulliform cells), photosynthetic parameters (increased carbon assimilation rate, leaf intercellular CO₂ concentration and water use efficiency, and reduction of stomatal conductance to water vapor, transpiration rate and carboxylation efficiency), and carbohydrate accumulation (increased concentration of soluble sugars and starch), when compared to plants at 400 ppm. Therefore, the changes in morphological traits of the leaf and the accumulation of carbohydrates, which were stimulated in the rice plants by increased CO₂ concentration (700 ppm), were associated with less severe brown spot, caused by B. oryzae.

在两个不同的水稻品种（BRSQuerência和Inov CL）中，在大气CO ₂浓度为400 ppm或700 ppm的环境中生长时，在不同时间确定了双极稻的发病机理，叶片解剖结构，光合系统参数和碳水化合物的积累。结果表明，暴露于700 ppm的植物的解剖特征（薄壁组织厚度和扁桃体细胞大小减少），光合参数（碳同化率提高，叶片细胞间CO ₂减少）发生了变化。与浓度为400 ppm的植物相比，浓度和水分利用效率降低，气孔对水蒸气的电导率，蒸腾速率和羧化效率降低，碳水化合物的积累（可溶性糖和淀粉的浓度增加）。因此，稻米中因CO ₂浓度增加（700 ppm）而刺激的叶片形态特征的变化和碳水化合物的积累与稻米芽孢杆菌引起的褐斑程度较轻有关。