Influence of Reproduction on the Abscission Process of Cotton (Gossypium barbadense L.) Leaves

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Abstract
Abscission responses of debladed petioles of young and older leaves were analysed during flowering, fruiting and post fruiting stages of development of G. barbadense plants. Identical abscission experiments were performed with materials collected from plants maintained in a vegetative condition by removal of flower buds. Inhibition of the abscission of debladed petioles by NAA was greater in debudded plants as compared to normal plants and the extent of inhibition gradually declined during growth. Promotive effects of ethrel and abscisic acid were higher in normal plants than in debudded plants. The duration of auxin-inhibitablc stage-I of abscission was extended in debudded plants and it gradually declined with the progress of development. Debudded plants were characterized by higher abscission inhibition during stage-I and lower abscission promotion during stage-II as a result of application of auxin compounds to the debladed petioles. Laminar tissues of debudded plants contained higher amounts of endogenous IAA and lesser amount of abscisions than did those of normal plants and in both cases the levels of these compounds changed markedly during plant development. Decrease of total RNA content in the distal tissues of the abscission zones was accompanied by increase in proximal tissues during abscission in both normal and debudded plants. This tendency was more pronounced in normally grown plants as compared to debudded plants.

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