Heterogeneity of the content of endogenous gibberellins in the leaves of winter wheat in relation to their insertion and ontogeny

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Abstract
Free and bound gibberellins were estimated in individual leaves of winter wheat using TLC a lettuce hypocotyl bioaasay. Bound gibberellins were extracted from the hydrolyzate of the water remnant after the removal of free gibberellins. Each leaf exhibits its own dynamics of free and bound gibberellins during its individual ontogeny, the gradual changes tending to be identical in every leaf. In young developing leaves the level of free gibberellins is high and that of bound is low. Further, inhibitors are sometimes present. The free gibberellin level rises with the activisation of growth and vital activity of a given leaf. Towards the end of the life cycle the content of free gibberellins is reduced to its minimum and inhibitory substances appear. The dynamics of bound gibberellins is opposite to that of free ones during ontogeny.
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