Summary
Etiolation of Todea barbara sporophytes and the subsequent deetiolation of excised leaf blades have been studied. In etiolated plants leaf blade growth is arrested, petiole and stem growth is enhanced, and root growth is decreased. De-etiolation permits the resumption of leaf blade growth and differentiation, and the resulting de-etiolated blade appears comparable to its light-grown counterpart in every respect but cell number. Only two factors are required to attain maximum surface area growth in cultured leaf blades; these are light and sucrose. The addition of plant growth substances does not increase the final area attained. However, the inhibition of leaf blade growth with growth retardants and its partial reversal by exogenously supplied gibberellic acid demonstrates a role for gibberellins in leaf expansion in Todea.
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Tavares, J.E., Sussex, I.M. Expansion growth of isolated leaf blades of Todea barbara . Planta 80, 113–128 (1968). https://doi.org/10.1007/BF00385587
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DOI: https://doi.org/10.1007/BF00385587