Experimental and Analytical Studies of Pteridophytes

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Abstract
The hypothesis, that the regulative effect of the shoot apex and adjacent leaf primordia on incipient growth centres is exercised by way of the incipient or prevascular tissue, has been tested by isolating leaf primordia and primordium sites, and also the shoot apex, by various shallow incisions. These incisions were such as to pass through the single superficial layer of meristem cells of the shoot apex, the incipient vascular tissue being left intact. Young primordia thus isolated by tangential incisions developed normally as leaves whereas with deep incisions buds are usually induced. Primordia isolated by four shallow incisions when the apex was not in active growth usually became dispersed and disappeared; the inception of prospective primordia could also be prevented in this way. The hypothesis relating to the functional activity of the pre-vascular tissue in morphogenesis, which is supported by the results obtained, is discussed in the light of other recent experimental evidence.

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