Abstract
A study was made of morphological and histological effects of various concentrations of sucrose on excised set III prospective frond primordia of Osmunda cinnamomea L. in sterile nutrient culture. Primordia under the temporary influence of 4% and 6% sucrose showed significant and progressive increases in final height of the leaves, and those on media containing sucrose concentrations up to 10% showed progressive amplification in the number of pairs of pinnae. These increases were the result of increased amount and duration of meristematic activity in certain tissues of the crozier during its formation. Parallel experiments using mannitol to replace sucrose proportionately and achieve equivalent concentrations have shown that the effect of the sucrose is not due to increased osmotic pressure in the medium. It is suggested that carbohydrate produced by photosynthesis in mature fronds above ground during the growing season may be one of the many factors that initiate and maintain meristematic activity in the young developing leaf primordia within the intact plant.
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