Abstract: The root exudates of peanut collected by a modified continuous collecting device and XAD-4 ion exchange resin were identified by GC-MS, and their allelophatic effects on Ralstonia solanacearum were studied. The root exudates mainly contained acetophenone, glycerol, benzoic acid, 3,5-dimethyl benzaldehyde, stearic acid, palmitic acid, and lactic acid, among which, only acetophenone had obvious promotion effect on the growth of R. solanacearum at concentration <0.1 g·L^-1, and significant inhibitory effect at concentration >0.1 g·L^-1. These findings could provide a credible basis for using acetophenone to control the occurrence of R. solanacearum.

Key words: blue carbon, seagrass bed, coastal wetland, climate change, carbon emission, carbon cycle.