The results indicated that 3 chemicals could greatly enhance resistance of potato tuber to early blight at low concentrations. Protection rates induced by phenol(1 mmol/L),benzoic acid(0.01 mmol/L),and paraaminobenzoic acid(5 mmol/L) were 43.21%,40.72%,and 28.75%,respectively.
Results showed that SA and OAA had no inhibition effect,but had remarkable induction efficiency. Protection efficiency of strawberry,which was treated with SA at 0.5 mmol/L or OAA at 20 mmol/L was 91.9% and 96.4%,respectively. K_2HPO_4 had no inhibition effect and induction efficiency.
pH variation of pectinases extract showed different effect on induced resistance to cucumber scab. At pH5.5,cucumber plants expressed the highest resistance with induced efficiency of 51.87% and 66.42% respectively at the two concentrations.
The disease severity of bacterial blight decreased after sprayed with nickel nitrate solution in rice seedilings. According to a plate test,nickel nitrate was slightly toxic to Xanthomonas oryzae pv.oryzae,so the decrease in disease index of bacterial blight was mainly due to induction resistance to X.oryzae pv.oryzae,by nickel nitrate in rice seedlings. The concentration of nickel nitrate ranging from 0.55 to 2.75 mmol/L was effective, of which,2.2 mmol/L had the optimum induction. Rice seedlings displayed...
The disease severity of bacterial blight decreased after sprayed with nickel nitrate solution in rice seedilings. According to a plate test,nickel nitrate was slightly toxic to Xanthomonas oryzae pv.oryzae,so the decrease in disease index of bacterial blight was mainly due to induction resistance to X.oryzae pv.oryzae,by nickel nitrate in rice seedlings. The concentration of nickel nitrate ranging from 0.55 to 2.75 mmol/L was effective, of which,2.2 mmol/L had the optimum induction. Rice seedlings displayed the strongest induction resistance to X.oryzae pv.oryzae when challenge inoculated with X.oryzae pv.oryzae 76 25 strain (high virulent) 3 days after the treatment of spraying the parts under the third leaf with 2.2 mmol/L nickel nitrate. The lesion length of pre treated rice leaves was 69.6% shorter than that of the control. On the 4th day after the treatment,the 3rd leaf of the crop was challege inoculated,from which the leaf acquired systemic resistance to bacterial blight.Its relative induction effect was 42.9%. The resistance effect induced by nickel nitrate lasted about 21 days.
Salicylic acid (SA), K2HPO4, filtrates of Cercospora zeae-maydis and oxalic acid (OA) were used to inducing the resistance of maize to gray leaf spot of maize (GLS) and searched changes of activities of phenylalanine ammonia lyase (PAL) which associated with the induced resistance among the four kinds of inducer. SA was the best inducer the filtrates of C. zeae-maydis and K2HPO4 were next, and after the weakest OA was the last one. PAL activities were low and the changes were stable and reached the peak value...
Salicylic acid (SA), K2HPO4, filtrates of Cercospora zeae-maydis and oxalic acid (OA) were used to inducing the resistance of maize to gray leaf spot of maize (GLS) and searched changes of activities of phenylalanine ammonia lyase (PAL) which associated with the induced resistance among the four kinds of inducer. SA was the best inducer the filtrates of C. zeae-maydis and K2HPO4 were next, and after the weakest OA was the last one. PAL activities were low and the changes were stable and reached the peak value in 8 days after treatment by inducer.
Resistance effect induced by salicylic acid (SA), p- aminophenol (p-AP) ,nickel nitrate, paraquat (PQ), cupric chloride and Cu reagent in rice seedlings to Xanthomonas oryzae pv. oryzae (XOO) was compared. The optimum induction conc entrations and optimum induction phase of these factors were determined. Their o ptimum induction concentrations were 0.05mmol/L, 0.5mmol/L, 2.2mmol/L, 0.15mg/L, 0.3mmol/L and 0.5mmol/L respectively. SA and PQ displayed the most effective in duction effect when the pre-treated...
Resistance effect induced by salicylic acid (SA), p- aminophenol (p-AP) ,nickel nitrate, paraquat (PQ), cupric chloride and Cu reagent in rice seedlings to Xanthomonas oryzae pv. oryzae (XOO) was compared. The optimum induction conc entrations and optimum induction phase of these factors were determined. Their o ptimum induction concentrations were 0.05mmol/L, 0.5mmol/L, 2.2mmol/L, 0.15mg/L, 0.3mmol/L and 0.5mmol/L respectively. SA and PQ displayed the most effective in duction effect when the pre-treated rice seedlings were inoculated with XOO 2 an d 4 days later respectively, while the other factors that the 3rd day after tr eatment. The local relative induction effect of SA, p-AP, nickel nitrate, PQ , Cupric acid and Cu reagent was 19.7%、34.4% 、69.6%、46.1%、12.3% and 18.9% resp ectively at their optimum induction concentrations. Obviously effective systemic resistance was induced by nickel nitrate, PQ and p-AP. On the 4th day after tre atment, they displayed the most significant induction effect of resistance to XO O systemically. The severity of bacterial blight was reduced by 40.9%、35.5% and 27.6% respectively. Moreover, resistance induced by them was still relatively significant on the 8th day after treatment. Comparatively, nickel nitrate was th e best chemical inducer.
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