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测定不同抗性大豆品种（系）接种ＳＭＶ不同株系后的叶绿素和光合速率，分析它们在大豆不同生育阶段的变化，阐明大豆感染ＳＭＶ后一些光化学活性特点：叶绿素ａ含量减少—叶绿体进行光合作用的原初反应中心受到伤害，光合速率降低，最终引致产量下降。ＳＭＶ对大豆叶绿素、光合速率及产量的影响因品种的抗性及ＳＭＶ毒系的致病力不同而有所差异。
The changes of chlorophyll and photosynthetic rate after inoculation of different strains of SMV in different lines were analyzed, and their changes in different growth stages of soybean were analyzed. Some photochemical activities of soybean infected with SMV were clarified: the content of chlorophyll a decreased - photosynthesis of chloroplasts Of the original reaction center was harmed, reducing photosynthetic rate, eventually leading to decline in production. The effects of SMV on the chlorophyll, photosynthetic rate and yield of soybean varied with the resistance of the cultivars and the virulence of SMV strains.