Abstract
Growth parameters and alkaline phosphatase (AP 1 ) isoenzyme pattern were studied in developing cotton fibre. Fibre length and dry weight when plotted against boll age showed four distinct phases: (i) initiation, (ii) elongation, (iii) secondary thickening and (iv) maturation. Considerable correlations were observed between the developmental phases and the appearance of isoenzyme pattern and their intensities according to the growth phases. The presence of isoenzymes during different phases indicating clearly developmental alterations are exists during fibre development, which are physiologically functional at different growth periods.
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