Influence of Resistance Inducers on Nitrogen, Phosphorus and Potassium Contents of Susceptible Chickpea Cultivars after Inoculation with Ascochyta rabiei
Muhammad Usman Ghazanfar1, Waqas Wakil2, Shahbaz Talib Sahi3 and Waqas Raza1*
ABSTRACT
Adequate nutrition plays a very important role in mitigating disease damage. Nevertheless, no specific rule exists that how a specific nutrient can alter the severity of the disease. Normally, plants are stressed by different environmental confines may be weakened and susceptible to disease and these include nutrient scarce plants. Tissue contents of potassium, nitrogen, and phosphorus of above parts of the ground of plant in three cultivars of chickpea (‘C-44’, Bittle-98’ and ‘Pb-91’) after treatment with Bion® (acibenzolar-S-methyl), salicylic acid (SA), potassium hydroxide (KOH) or plant extracts of neem (A. indica A. Juss.), datura (D. metel L.) and garlic (A. sativum L.) were investigated 7 and 14 days after inoculation with Ascochyta rabiei. Elevated nitrogen (2.95%), potassium (1.05%) and potassium (533.00 ppm) contents in the tissues decreased disease severity (79.3%) in cv. C-44. These increases were significant (P ≤ 0.05) after 14 days of inoculation with plant pathogen in plants pretreated with chemicals. There was no significant change in plants treated with the plant extracts except with extracts of A. indica. Chemically increased N, P, and K were highest in cultivar C-44 followed by Pb-91 and Bittle-98. A similar trend was observed with plant extract treated plants, with the greatest effect observed with A. indica extracts. The results indicate that chemicals reported to induce resistance to pathogens may increase mineral contents which prevent the spread of the pathogen.
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