BIOCHEMICAL STUDIES ON WHEAT PLANT

Abstract

Calcareous soils characterized by increasing pH and calcium carbonate values which negatively affected on macro-and micronutrients availability needed for plants. Therefore, two field experiments were carried out at Nubaria Agricultural Experimental station, agricultural Research center (ARC) during the two successive seasons. The following results were obtained.

1- Yield and yield components :

a- Grain yield I feddan and 1000 grain weight were significant increased with sulphur supply. b- Yields and yield components were increased with different applied micronutrients. c- Grain and straw yields and grain index were significantly affected with micronutrients application under applied sulphur treatments by seed coating method. 2- Photosynthetic pigments : a- Chlorophyll a,b, total and carotenoids contents were increased with sulphur application. b- All applied microntrients induced significant increments of chlorophyll a.b, total and carotenoids contents. c- All photosynthetic pigments contents increased with different micronutrients under sulphur application. 3- Enzyme activities : a- polyphenol oxidase and peroxidase enzyme actrvmes were slightly and insignificantly increased by suphur application. b- The activities of polyphenol oxidase, peroxidase and catalase enzymes were significantly increased with all studied micronutrients • application. c- Peroxidase and catalase enzyme activities in wheat flag leaf were significnatly increased with sulphur application under different micronutrients application.