Induce of Crude Toxin from Cladosporium fulvum on Defense Enzyme and Activity Oxygen of Tomato Seedlings

doi:10.7668/hbnxb.2009.06.044

Abstract

Abstract: The inducement of crude toxin from Cladosporiumfulvum on defense enzyme (SOD,POD,PAL) and ac tivity (O2-,H2O2) was studied in leaves of different tomato varieties by soaking method.The studies provided scientific basis on plant physiological and biochemical resistance mechanisms induced by pathogentoxin.The results showed that superoxide dismutase (SOD) activity of all varieties descended,but the resistant variety had lower declining ratio and higher enzyme activity than that of the susceptible one.Changes of peroxidase (POD) activity in two varieties were simi lar.POD activity increased at first,followed by a decline,but two varieties had a little diversity in activity change.Pheny lalanine ammonialyase (PAL) activity increased in two varieties,but PAL activity in the resistant variety increased fast,and increasing ratio was higher than that in susceptible one.Production rate of superoxide anion (O-) and hydrogen peroxide (H2O2) content increased.Increasing ratio in resistant variety was higher than that in susceptible one.The ac tivity in the resistant variety appeared earlier than that in the susceptible one.Changes of defense enzyme and activity oxygen induced by toxin from Cladosporium fulvum in tomato seedlings were closely related to their resistance.

Key words: Cladosporium fulvum, Crude toxin, Defense enzyme, Activity oxygen, Induced resistance to diseases

CLC Number:

S36.12.19

LIU Hui-qin, LIU Hui-ping, HAN Ju-cai. Induce of Crude Toxin from Cladosporium fulvum on Defense Enzyme and Activity Oxygen of Tomato Seedlings[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(6): 215-218. doi: 10.7668/hbnxb.2009.06.044.

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