Allelopathic effects of Cymbopogon citratu volatile and its chemical components
香茅天然挥发物的化感作用及其化学成分分析

This paper studied the allelopathic effects of Cymbopogon citratus volatile on the seed germination and seedling growth of corn and barnyard grass (Echinochloa crusgalli) in field and in obturator,and analyzed the chemical components of the volatile with SPME and GC-MS. The results of bio-assay indicated that the germination rate of corn or barnyard grass intercropped with C.citrate or enclosed in obturator with fresh C.citratus had no significant difference from the control,but the seedling growth of corn and barnyard grass was significantly inhibited.The volatile from C.citratus roots contained 10 components.The main component was longifolene-(V4),occupying 56.67% of the total,the second component was selina-6-en-4-ol (20.03%),while the others were under 10%.There were 12 components in the volatile from C.citratus shoots.The main component was citral (53.98%),the second was z-citral (34.40%),and the others were under 4%.There were 2 monoterpenes and 9 sesquiterpenes in the volatile from shoots,and all the terpenes in the volatile from roots were sesquiterpenes.Therefore,the allelopathy of C.citratus should not be ignored when planted it with other crops.