[Effects of exogenous melatonin on accumulation and chemical form of Cd in rice].

Effects of exogenous melatonin on accumulation and chemical form of Cd in rice seedlings were investigated. The results showed that Cd stress significantly decreased the biomass of shoots and roots, and the chlorophyll content in rice leaves. The addition of exogenous melatonin could remarkably increase the biomass of rice and significantly decreased Cd content in the shoots and roots.

[Alleviation Effects of Exogenous Melatonin on Ni Toxicity in Rice Seedings].

The alleviation effect of exogenous melatonin (MT) on Ni toxicity in rice seedings was investigated. The results showed that low concentration of Ni stress (10, 50 μmol·L) had little effect on the growth of root of rice seedings, while higher concentration of Ni stress (100-1000 μmol·L) significantly inhibited the growth of rice root. Compared with the control treatment, the addition of 100 and 1000 μmol·L Ni would decrease the total length and surface area of root by 63.

[Phenols pollutants in soil and shallow groundwater of a retired refinery site].

To study the distribution of phenol compounds in a retired refinery site, 21 soil sampling sites and 8 shallow groundwater wells were investigated. The results showed, shallow unconfined groundwater of the site was in a serious pollution situation and the phenols concentration was much higher than quality standard for ground water. Confined water sample was slightly contaminated by phenols and the total quality was good.