A quantitative estimation of sequential foliage development and fertility inDryopteris crassirhizoma |
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Authors: | Toshiyuki Sato |
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Institution: | (1) The Institute of Low Temperature Science, Hokkaido University, 060 Sapporo |
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Abstract: | The foliage development ofDryopteris crassirhizoma Nakai was quantitatively estimated by measurements of shape and size of leaves from different developmental stages of sporophytes,
to lead to an understanding of the life history characteristics of the species. The number of midrib branches (NV, number
of veins) of the leaf corresponds to the leaf-shape complexity (DI, dissection index; shape complexity from a circle) and
length of leafblade (BL). Some quantitative characters, such as leaf uniformity (decrease in NV variation), changes in shape
and increase in number of leaves, vary progressively during foliage formation. The sequence of foliage development can be
quantified using the parameter NV: for example, 15-NV for leaf uniformity, 30-NV for leaf-shape change from triangular to
oblanceolate, 60-NV for increase in leaf number and leaf fertility in the course of sporophyte ontogeny.
Contribution No. 3297 from the Institute of Low Temperature Science, Hokkaido University. |
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Keywords: | Dryopteris crassirhizoma Foliage development Leaf uniformity Number of veins (NV) Size and shape |
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