In order to explore plant immunoinducer with control effect to watermelon virus disease,taking zucchini yellow mosaic virus(ZYMV)as control object,plant pathogenicity and relative control efficiency as indicators,this paper evaluated 6 agents with different concentrations,including picolinic acid(Pip),N-hydroxy-picolinic acid(NHP),gallic acid,benzothiadiazole(BTH),chitosan,β-aminobutyric acid(BABA),and their two-agent and three-agent combinations for their control effects on this virus disease.The results showed that the control effect of single-agent on ZYMV in watermelon ranked from high to low as follows:NHP(0.5 mmol·L-1),Pip(2 mmol·L-1),chitosan(1 g·L-1),gallic acid(0.5 g·L-1),BABA(1 mmol·L-1),BTH(0.1 mmol·L-1).In the combination agent experiment,the best control effect of the two-agent combination was 2-Ⅶ(NHP 0.5 mmol·L-1+Pip 2 mmol·L-1).Eleven days after inoculation,when incidence rate of the plant by control-treated water reached 100.00％,the incidence rate of the combination-treated plants was 10.00％,and relative control effect was 89.99％.However,this combination agent would affect plant growth.The combination of 3 agents with better control effect were 3-Ⅰ(gallic acid 0.5 g·L-1+NHP 0.5 mmol·L-1+BABA 1 mmol·L-1)and 3-Ⅱ(gallic acid 0.5 g·L-1+NHP 0.5 mmol·L-1+Pip 2 mmol·L-1).Their incidence rates were 27.27％and 33.33％,respectively,and their relative control effects were 79.49％and 68.27％,respectively,significantly higher than those of the other combinations.Among them,the incidence rate of the plants treated with 3-Ⅱ increased slowly,and disease control effect was more lasting than that of the other treatments.Thus,3-Ⅶ had the best control effect on ZYMV.The results indicate that NHP,Pip and gallic acid had potential application value in preventing watermelon virus diseases.
维普
万方数据
