Phytotoxicity of thiocyanate to rice seedlings.
The acute toxicity of potassium thiocyanate (KSCN) and ammonium thiocyanate (NH(4)SCN) to rice seedlings was tested. Hydroponically-grown plants showed different responses to the two species of thiocyanate. NH(4)SCN caused more severe stress to rice seedlings than KSCN. A significant reduction in transpiration and relative growth was observed with all NH(4)SCN treatments (p < 0.01), while the effect of KSCN on rice seedlings was more evident at greater than 100 mg SCN/L (p < 0.01). Both chemicals had a negligible effect on total chlorophyll content in shoots of rice seedlings (p > 0.05). Although phyto-transport of thiocyanate was apparent, rice seedlings showed significantly higher removal potential for NH(4)SCN than KSCN.
Department of Environmental Sciences and Engineering, Hunan Agricultural University, Changsha, 41028, People's Republic of China. yuxiaozhang@hotmail.com
Xiao-Zhang
XZ
Yu
Fu-Zhong
FZ
Zhang
Fan
F
Li
D012275:Oryza / Q000187:drug effects* / Q000254:growth & development; D036226:Seedlings / Q000187:drug effects* / Q000254:growth & development; D013861:Thiocyanates / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D013861:Thiocyanates; D014874:Water Pollutants, Chemical; C026976:thiocyanic acid; C031760:thiocyanate