The structure and cytochemistry of the pistil of Hypericum calycinum: the style |
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Authors: | F. Ciampolini K. R. Shivanna M. Cresti |
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Affiliation: | (1) Dipartimento di Biologia Ambientale, Università di Siena, Via P.A. Mattioli, 4, I-53100 Siena, Italy;(2) Present address: Department of Botany, University of Dehli, 110007 Dehli, India |
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Abstract: | Summary A typical style of Hypericum calycinum is solid with a core of transmitting tissue traversing the whole length of the style. This transmitting tissue consists of loosely arranged cells and large intercellular spaces filled with a secretion product. The secretion product is rich in lipids, but poor in proteins and polysaccharides. The intercellular spaces of the transmitting tissue originate partly by a separation of cells as a result of the decomposition of the middle lamella and partly by degeneration of some of the cells of the transmitting tissue. H. calycinum is self-compatible. Both self- and cross-pollinations result in profuse pollen germination on the stigma and pollen tube growth through the style. The data on Hypericum is discussed in relation to information available on other solidstyled systems. |
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Keywords: | Hypericum calycinum Pistil Pollen pistil interaction Transmitting tissue Ultra structure |
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