Effect of potassium fertilizer types on alleviating cadmium stress in pota-toes
In order to explore the effect of potassium fertilizer types on alleviating cadmium stress in potatoes and clarify the physiological mechanism of potassium fertilizer types on potato growth under cadmium stress,a pot experiment was conducted to study the effects of potassium sulfate(S),potassium chloride(Cl),their equal ratio treatments(SCl)and cadmium stress on potato growth and physiology.The results showed that when plants were subjected to cadmium stress(25 mg·kg-1),the plant height,SPAD,biomass,root vitality,and tuber mass were significantly higher than those of the SCL and Cl treatments,and the net photosynthetic rate,stomatal conductance and transpiration rate of the S treatment were significantly higher than those of the SCL and Cl treatments.Compared with the absence of cadmium,cadmium stress significantly increases the activity of superoxide dismutase(SOD),proline(Pro),and malondialdehyde(MDA)con-tent of potato leaves,and the impacts on the content of reduced glutathione(GSH),complex elements(PCs),and non protein thiol(NPT)were significantly related to the type of potassium fertilizer.Under cadmium stress,the GSH,NPT,PCs,Pro content,and SOD activity in potato leaves S treatment were significantly higher than those of Cl treatment,while the MDA content was significantly lower than that of Cl treatment.The cadmium content in the roots of S treatment was significantly lower than that of Cl treatment,and the transport coefficient of cadmium in the stems and leaves of S treatment were significantly higher than that of Cl treatment,while the difference in cadmium content in the stems and leaves was not significant.Overall,compared to potassium chloride,potassium sulfate can promote the growth of potato plants,alleviate the impact of cadmium stress on potatoes,reduce the absorption of cadmium by potatoes in the soil,and promote the migration of cadmium from potato roots to above ground parts.
PotatoType of potassium fertilizerCadmiumGrowthAntioxidant system
万方数据
维普
