فیزیولوژی محیطی گیاهی (Nov 2007)
Effect of pix (mepiquat chloride) on growth, amount of carbohydrate and antioxidant enzyme activity in cotton seedling
Abstract
Cotton has non limitation growth and is sensitive to environmental changes and usually grows more than natural dimension. These non limitation growths not only cause serotine of product and quaility deacresing but also increase pests, disease and harvesing expenses in cotton. Pix is one plant growth regulator that cause decrease vegetative growth in cotton.It acts as antigibberellin and inhibits synthesis this hormone. There are some researches about effect of pix on growth parameters of cotton but a little information's are about pix effects on biochemical reactions and antioxidant systems. In this research effect of different concentrations of pix includes 0 (control)10, 20, 30 and 40ppm on germination percentage, radicle length and Catalase peroxidase and polyphenol oxidase in cotton seedling was evaluated. Our results showed that percentage of germination increased with increasing pix concentration. Lenght of radicle increased until 20 ppm and decreased in concentration 30 and 40 ppm of pix. Also with increasing of pix amount of soluble sugar increasd and starch content decreased Catalase activity decreased while polyphenol oxidase activity increased. Activity peroxidase also increased until 30ppm concentration.
