Ozone Effects on Cell Wall Metabolism of Avena Coleoptile Sections

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Abstract
Pretreatment of Avena coleoptile sections with 90-140 ppm by volume of ozone for 6 hours resulted in a subsequent stimulation of glucose uptake without destroying the final growth capacity of the tissue. This phenomenon occurred at both 10-5 [image] and 0.05 [image] external glucose concentrations. Cellulose synthesis and incorporation of C14 from C14 labeled glucose into glucan components of the aqueous and dilute acid soluble cell wall fractions were most readily inhibited by ozone treatment. Metabolism of other cell wall carbohydrate components was affected much less under conditions resulting in less than 50% inhibition of potential growth. The relationship of ozone to other inhibitors of ceil wall metabolism and growth is discussed. It was suggested that ozone inhibition of glucan and cellulose metabolism may be a factor in inhibition of plant growth by ozone.