Physiological and biochemical responses as affected by antioxidant(ascorbic acid) in Giza 80 cotton cultivar [electronic resource].

Includes references.

Two field experiments were carried out to investigate the effects of spraying antioxidant ascorbic acid (ASA) at eight concentrations i.e. zero, 100, 200, 300, 400, 500, 800, 1000ppm at start of flowering on plant growth characters, leaf chemical constituents, enzyme activity, yield, yield components, as well as seed quality and fiber properties of Giza 80 cotton cultivar. The experiments were conducted at Sids Agricultural Experimental Station, during 2003 and 2004 seasons. The obtained results could be summarized as follows: 1. Ascorbic acid application increased significantly chlorophyll (chlorophyll a, b and total chlorophyll), carbohydrate content in cotton leaves (reducing, non reducing, total soluble sugars) and poly and total phenols. 2. Ascorbic acid application increased the activity of enzymes(peroxidase and polyphenol OXidase). 3. Ascorbic acid application significantly increased plant height, No. of fruiting branches, No. of bolls per plant, boll weight and seed cotton yield/F. 4. Spraying ascorbic acid did not significantly affect earliness %, lint % and fiber properties (Micronaire reading and Pressley index). 5. Results of seed quality showed that seed index, oil and protein percentage were significantly increased by ascorbic acid applications.

Summary in Arabic.

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