Change in photosynthetic pigment concentration of wheat grass (Agropyron repens) cultivars response to drought stress and foliar application with Chitosan.

Abstract

In order to evaluation of Change in photosynthetic pigment concentration on Agropyron cultivars response to drought stress condition and foliar application with Chitosan an investigation was carried out with Randomized complete block design in split factorial with three replication. Treatments consisted of two Agropyron varieties containing A. elengatum, A. desertrum, Acristatum, and 2step application chitosan (with and with out chitosan) and 3 level stress (control, cut of irrigation at stage of 30 according to BBCH, cut of irrigation at stage of 40 according to BBCH).Finally Leaf chlorophyll content was measured. These traits were affected by drought condition, chitosan application and cultivar showed significant differences (p<0.01). Results show that all traits were increased in stress in stage of 30 BBCH. Application chitosan could improve chl a, b, T, carotenoide. also A.desertrum was the best cultivar for chl a, T, carotenoide but in chl b A.elengatum was the best cultivar. Chitosan had an positive effect on drought tolerance in some cultivars. Maximum chl b, T, carotenoide under the effects of stress × var × spraying chitosan was in the Stress in stage of 30 BBCH with applied chitosan on A.cristatum. This plants in stage of 30 BBCH (end of tillerring) was more tolerance than stage of 40(end of stem elongation) to drought condition.