Seasonal Changes in Gibberellin-Like Substances of Shamouti Orange(Citrus Sinensis(L.) Osbeck) Trees In Relation To Ringing

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Abstract
The activity of GA-like substances present in the tissues was determined in Shamouti orange trees, budded to sour orange stock, left undisturbed or ringed at different seasons of the year. The bark of the trunk above and below the ring, the bark of main branches 1.5 m above ground, lateral shoots and actively growing rootlets were assayed 24 h and two weeks after each ringing date. Seasonal curves of water-soluble gibberellins, with clear peaks and troughs, were obtained, the main feature being opposite trends in lateral shoots and rootlets. Opposite trends in these organs that were distant from the ring at the opposite ends of the tree were also evident with respect to the effects of ringing. Nearer to the ring the effects were less consistent. The effects of ringing on yields might partly be explained by the accumulation of gibberellins in the aerial parts and by interference with its production in, or its translocation to, the roots.

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