Abstract
Growth parameters and auxin metabolism of developing cotton (Gossypium hirsutum L., cv. Sankar 5) fibre were studied in plants grown in the field. Fibre length and dry weight were plotted against boll age and fitted to the best-fit curves by computer curvilinear regression analysis. Based on this analysis, fibre development was divided into four phases: (i) initiation, (ii) elongation, (iii) secondary thickening, and (iv) maturation. Changes in IAA oxidase and peroxidase activity showed that IAA catabolism was low during the elongation phase, while during the phase of secondary thickening it was very high (four-fold increase). It is suggested that the level of IAA may regulate the termination of primary wall extension and the initiation of cellulose deposition in cotton fibre.
Published Version
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