Abstract
Rice seedlings grown from seeds that had been soaked in dodecyl DL-alaninate hydrochloride (AH) solution were found to be resistant to infection by the rice blast fungus, Pyricularia oryzae.
1. Number of lesions was fewer on rice seedlings grown from AH-soaked seeds than on seedlings grown from the water-soaked seeds.
2. Resistance to infection increased as concentration of AH was increased up to 500ppm. Concentrations above the optimum caused a decrease in the preventive value of the treatment.
3. Resistance was most effectively induced when seeds were soaked in AH solution for 72 hours.
4. No significant resistance was induced in seedlings for first 20 days under a glasshouse condition. Resistance then increased and the maximum inhibition of disease development was attained at about 30 days. This induced resistance was retained without decrease for 75 days.
