Effect of exogenous salicylic acid on the photosynthetic and physiological characteristics of Viola tricolor L.under cadmium stress
This article explored the effects of cadmium stress and exogenous salicylic acid on the photosynthesis and physiological characteristics of Viola tricolor L.,providing a basis for rational application of salicylic acid and alleviating cadmium toxicity.Viola tricolor L.was planted under Cd stress(200 mg·kg-1),and spray 0(SA0)and 50(SA1),100(SA2),200(SA3),500(SA4)μmol·L-1 salicylic acid on the leaves,to explore its effects on the growth,photosynthesis,osmoregulation substances and enzymatic protection system of Viola tricolor L.The results showed that 200 mg·kg-1 of Cd can lead to a significant increase in MDA,significantly inhibit the vegetative growth,reproductive growth and photosynthesis of Viola tricolor L.;The application of an appropriate amount of salicylic acid(100-200 μmol·L-1)can reduce the content of MDA and increase the plant length,stem diameter,leaf area,number of leaves and flowers,dry weight,fresh weight and water content of Viola tricolor L.under Cd stress;The net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr)were increased;The application of an appropriate amount of salicylic acid(100-200 μmol·L-1)can also increase the content of proline,soluble protein,soluble sugar and the activity of superoxide dismutase(SOD),catalase(CAT),and peroxidase(POD),but if the concentration reaches 500 μmol·L-1,the effect is not as good as when the concentration is lower,indicating that an appropriate amount of salicylic acid(100-200 μmol·L-1)can significantly alleviate the Cd toxicity of Viola tricolor L.,and 200 μmol·L-1 is the best application concentration based on all indicators.
万方数据
维普
