Regulation of Leaf Form in Centaurea solstitialis L. II. The Developmental Potentialities of Excised Leaf Primordia in Sterile Culture

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Abstract
Some factors controlling heteroblastic development in Centaurea solstitialis L. are reported and discussed. Leaf primordia normally destined to become lobed leaves were excised and grown in sterile culture in a variety of media. It was shown that in order to develop into an adult leaf, a primordium must remain in situ at the apex for a certain period of time. Primordia P5 and older have been "at" the apex for the minimum time so that when excised and placed in sterile culture they become relatively normal but miniature adult leaves. Primordia explanted to a GA3-supplemented medium initiate a reduced number of lobes and develop as relatively less complex leaves than comparable primordia in control medium. Primordia explanted to media supplemented with Cycocel develop in a manner similar to primordia in control medium. It is proposed that a gibberellin or gibberellinlike system is operating, at least in part within the developing leaf, and is one of the factors regulating whether a leaf primordium develops into a juvenile or adult leaf.

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