Functional morphology of the horseshoe spot in the frustule of Planothidium species (Bacillariophyta)
Morphology of the horseshoe spot (HHS) with the cavity has been investigated in details in several species of Planothidium Round et Bukht. that carry out an attached mode of life. On the base of photomicrographs obtained with light and scanning electron microscopy, the model of the HSS longitudin...
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| Date: | 2014 |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
Інститут ботаніки ім. М.Г. Холодного НАН України
2014
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| Series: | Український ботанічний журнал |
| Subjects: | |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Functional morphology of the horseshoe spot in the frustule of Planothidium species (Bacillariophyta) / L.M. Bukhtiyarova, A.M. Lyakh // Український ботанічний журнал. — 2014. — Т. 71, № 2. — С. 223-227. — Бібліогр.: 21 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | Morphology of the horseshoe spot (HHS) with the cavity has
been investigated in details in several species of Planothidium
Round et Bukht. that carry out an attached mode of life. On the
base of photomicrographs obtained with light and scanning electron microscopy, the model of the HSS longitudinal section was
designed and light rays tracing through it has been implemented.
It has been shown that HHS is an optical system that may diffuse
or focus light, depending on the refractive index of the matter inside the cavity. For the first time HHS functions are revealed in a
living diatom organism: diffusion of light over the chloroplast side
turned to the substrate. The vertical part of inner convexity generates on the attached valve the heating arc that provides a diatom
cell with additional heating energy. Thus, a new mechanism of
light utilization was detected in the diatom species widely distributed in benthic ecosystems. A new term, lensoid, and terminology
for its morphological description are proposed. |
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