sporopollenin


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sporopollenin

[¦spȯr·ō′päl·ə·nən]
(biochemistry)
A substance related to suberin and cutin but more resistant to decay that is found in the exine of pollen grains.
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References in periodicals archive ?
Identification of ionene and other carotenoid degradation products from the pyrolysis of sporopollenins derived from some pollen exines, a spore coal and the green river shale.
Since mature orbicules consist of sporopollenin they are well represented in the fossil record.
It has been reported that [11] orbicules originate in the cytoplasm of the tapetal cells as lipoidal pro-orbicular bodies that accumulate below the membrane and eventually extrude to the cell surface (facing the locule) where they provide sporopollenin precursors for exine formation.
intine: Inner wall of a pollen grain that does not contain sporopollenin.
The protective pigment, called sporopollenin, and several of its long-lived breakdown products absorb a specific wave-length of ultraviolet radiation, says Lomax.
Pollen wall and tapetum development in Anaxa gorea brevipes (Annonaceae): sporoderm substructure, cytoskeleton, sporopollenin precursor particles, and the endexine problem.
The cell may enter a quiescent state during which its covering becomes thicker and accumulates materials similar, at least in terms of their resistance, to the sporopollenin of the walls of pollen grains and other plant spores.
On the other hand, the dense layer of Heterocapsa niei and other dinoflagellates has been suggested to contain sporopollenin, a very resistant plant terpenoid that has been demonstrated to be insoluble, even in hot ethanolamine (Loeblich, 1970; Morrill and Loeblich, 1981).
The four cells resulting from meiosis/cytokinesis become a tetrad of spores, each encased in a heavy sporopollenin wall, the sporoderm.
its component sporopollenin is as effective as cholestyramin in binding neurotoxins and more effective in binding toxic metals then any other natural substance found;
Orbicules are tiny sporopollenin particles up to 3-4 [micro]m in