The chemical components of the volatiles from Vetiveria zizanioides were analyzed by SPME and GC-MS. In the roots, the main component was valencene (30.36%), while in the shoots and leaves, they were ...9-octadece-namide (33.50 % ), 2, 6, 10, 15, 19, 23-hexamethyl-2, 6, 10, 14, 18, 22-tetracosahexaene (27.46% ), and 1,2-benzendicarboxylic acid, diisooctyl ester(18.29% ). The results showed that there were many terpenoids in the volatils. In shoot volatiles, there existed 3 monoterpenes, 2 sesquiterpenes and 1 triterpene. Most of the volatiles in roots were sesquiterpenes.
Two rice varieties with varied perchlorate-sensitivity were selected to study their response when exposed to perchlorate-contaminated environment. Gannuoxiang is a perchlorate-resistance rice variety ...while IR65598-112-2 is a perchlorate-sensitive rice variety. A pot experiment was conducted to study the effects of perchlorate stress on plant growth, development and nutrient uptake. Perchlorate with three concentration levels at 0.2, 2.0 and 4.0 mmol/kg was added to the soil for different treatments at the end of recovering stage after transplanting. In conclusion, perchlorate pollution can decrease the growth and tiller number of the two rice varieties, delay their development, consequently, result in low biomass and low accumulation of nutrient. The phyto-toxicity of perchlorate to rice not only depended on the pollutant concentration and its duration, but also on the specific rice varieties and its organs.