Vol. 5, Issue 6 (2020)
Inorganic chemical as inducer in induced resistance against Alternaria blight of potato
Author(s): Kishan Lal, SK Biswas, Arshad Husain, Shivam Kumar
Abstract: Tuber treatment and foliar spray with inorganic chemicals as inducers significantly reduced disease severity of early blight of potato as compared to control 1. The minimum disease severity with 12.40%, 17.60% and 20.65% were recorded in case of both tuber treatment and foliar spray with salicyclic acid as inducer at 2, 6 and 10 days of pathogen inoculation, respectively. Biochemical changes are associated with induced resistance showed that total soluble protein content in potato leaves before application of inducers ranges from 20.59 -21.44 mg/g of fresh leaves. Whereas after application ranges from 22.38 to 33.09 at 2 days, 24.36 to 35.39 at 4 days, 24.46 to 35.75 at 6 days, 24.66 to 35.98 and 23.62 to 34.58 mg/g of fresh leaves as 10 days of inoculation, indicating soluble protein content increase in all the treatments. The highest content of soluble protein was recorded from salicylic acid treated potato leaves, indicating 33.07, 35.27, 35.67, 35.87 and 34.48 mg/g of fresh leaves. Similarly, the maximum total phenol content was found in salicylic acid treated potato leaves which were 2.64, 3.17, 3.27, 3.34 and 3.29 mg/g of fresh leaves at 2, 4, 6, 8 and 10 days of pathogen inoculation, respectively. The correlation regression equation showed negative correlation (r) -0.723 and -0.850, between disease severity with total protein and total phenol at 2 days of pathogen inoculation, respectively. Similarly, negative correlation had also been found -0.957 and -0.823, at 4 days, -0.615 and -0.141, at 6 days, -0.943 and -0.916 at 8 days and -0.695 and -0.777 at 10 days of pathogen inoculation.