Changes in bio-chemical constitutes in Barley infected with Drechslera graminea leaf stripe

Bio-chemical changes in five varieties of barley infected with Drechslera graminea leaf stripe were determined in the present investigation. Total phenolic compounds were higher in healthy leaves of RD-2462 (highly resistant) followed by RD-2472 (resistant) and RD-2475 (moderately susceptible). Reduction in the contents of total sugars, reducing and non-reducing sugars were observed in diseased leaves of all five barley varieties irrespective of susceptibility towards D. graminea. The soluble protein content was significantly decreased in diseased leaves of all five varieties. Maximum decrease in soluble protein was observed in diseased leaves of RD-2035 followed by RD-2406 and RD-2475. Increase in peroxidase (PO) and polyphenol oxidase (PPO) activities in diseased leaves of highly susceptible variety (RD-2035) was highest followed by susceptible (RD-2406), moderately susceptible (RD-2475) resistant (RD-2472) and highly resistant variety (RD-2462). The phenylalanine ammonia lyase (PAL) activity was highest in leaves of highly resistant (RD-2462) followed by diseased leaves of resistant (RD-2472) moderately susceptible (RD-2475) susceptible and lowest in highly susceptible variety (RD-2035).