Abstract
Summary Growth parameters and indolyl-3-acetaldehyde dehydrogenase activity were investigated during the entire period of cotton ( Gossypium hirsutum L. cv. SRT-I) fibre development. A significant increase in indolyl-3-acetaldehyde dehydrogenase activity was recorded during the elongation phase while during the secondary thickening phase it decreased suggesting thereby the importance of auxin biosynthesis in elongation growth. The role of auxin turnover in the regulation of cotton fibre development is discussed.
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