Effects of Ca²⁺ in Symptom Masking of TMV Inoculated Tobacco Under High Temperature Stress

The results of Ca²⁺ and inhibitor treatments showed that after TMV inoculating,the activities of POD and SOD in tobacco leaf increased obviously by Ca²⁺ treatment and followed by high temperature stress,while those activities decreased significantly by Ca²⁺ specific chelator EGTA and CaM specific inhibitor CPZ treatment.There was no significant difference in TMV latent period between different treatments(Ca²⁺,EGTA,CPZ,and check);however,mosaic symptom was slightly masked by Ca²⁺ treatment and aggravated by treatments by EGTA and CPZ;it indicated that Ca²⁺ signal route probably involved in symptom masking under high temperature stress.