From the perspective of the most abundant component (Table 1), the most abundant component of the CP group was heptadecane, 2,6,10,15-tetramethyl, with a content of 8.46%, but that of the P group was 9-octadecenoic acid (Z)-, methyl ester, with a content of 31.88%. In the CV group, the content of 9-octadecenamide, (Z)- was 9.6%, and in the V group, the content of 9-octadecenoic acid (Z)-, methyl ester was 22.31%. According to the above results, the most abundant components of the two plant groups changed to esters under SD stress, and the content increased. Under material stress, the secretion of some compounds in plant root exudates was inhibited or changed (Rolfe et al. 2019). In this study, dichloromethane was used for extraction, and the obtained experimental results covered relatively complete root exudates.