Effect of Deficit Irrigation Stress and Plant Density on Antioxidant Enzymes Activity, Compatible Osmolytes, Relative Water Content and Yield of Baby Corn (Pashan Cultivar)
In order to study the effect of deficit irrigation and plant density on antioxidant enzymes activity, compatible Osmolytes, relative water content and yield of baby corn (Pashan cultivar) a field experiment based on randomized complete block design (RCBD) arranged in split-plot with three replications was conducted at the Education-Research Farm (With geographical position: 37°33' north, 59°11' east), Mashhad Branch, Islamic Azad University, Mashhad, Iran, during in cropping season 2018-2019. Irrigation deficit at three levels (0 (Full irrigation), 20 and 40% less than the irrigation requirement) was considered as the main plots and plant density at three levels (100, 150 and 200 thousand plants/ha) were considered at the sub plots. Analysis of variance showed that the effect of deficit irrigation on all variables, effect of plant density on relative water content, husked cob yield, dehusked cob yield and dehusked standard cob yield and interaction between of two factors on all variables (Expect: relative water content and superoxide dismutase activity) were significant. The results showed that with increasing deficit irrigation (increasing stress) and increasing plant density, the relative water content decreased. Also, with increasing deficit irrigation, superoxide dismutase activity increased. Mean comparison of traits under influence of two factors showed that with increase of deficit irrigation and plant density proline content, soluble carbohydrates and the activity of catalase and peroxidase enzymes increased due to increased drought stress and intraspecific competition. Husked cob yield, dehusked cob yield and dehusked standard cob yield decreased due to of deficit irrigation. But at all levels of deficit irrigation, cob yield increased with increasing plant density. In general, the results showed that drought stress increased the content of compatible osmolytes and the activity of antioxidant enzymes in the tested cultivar, but this increase was not sufficient to reduce the effects of stress on yield.
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