Hormonal regulation of fibre elongation and the enzymic hydrolysis of abscisic acid conjugate in developing cotton (Gossypium arboreum L.) fibres
2009
Sharma, P. | Malik, C.P.
Changes in endogenous levels of IAA, GA3 and ABA during in vivo fibre growth of Gossypium arboreum L. cv. LD 327 showed an over riding influence of ABA in limiting the rate of fibre elongation. The fiber growth of unfertilized cotton ovules cultured in vitro was elevated by the application of Fluridone markedly decreased the ABA level concomitant with an increase in the levels of promoter (IAA, GA3) in cultured ovules. The enzymic hydrolysis of the Ji-glucopyranosyl ester of ABA by glucosidases . and esterase were studied in fibres at 15 and 35 days after anthesis. Since, the activity levels of two hydrolase did not correlate with the ABA contents at two stages of fibre growth, it is saggested that the high content of free ABA at 15 DAA was not a consequence of the increased acticity of the ABA-Glc splitting enzymes. Our data suggest that ABA conjugate is final product of the AE metabolism under different stages of fibre growth
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