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- Q1067743 subject Q6951524.
- Q1067743 subject Q7214722.
- Q1067743 abstract "Sporopollenin is one of the most chemically inert biological polymers. It is a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and is usually well preserved in soils and sediments. The exine layer is often intricately sculptured in species-specific patterns (see image at right), allowing material recovered from (for example) lake sediments to provide useful information to palynologists about plant and fungal populations in the past. Sporopollenin has found uses in the field of paleoclimatology as well. Sporopollenin is also found in the cell walls of several taxa of green alga, including Phycopeltis (an ulvophycean) and Chlorella.The chemical composition of sporopollenin is not exactly known, due to its unusual chemical stability and resistance to degradation by enzymes and strong chemical reagents. Analyses have revealed a mixture of biopolymers, containing mainly long chain fatty acids, phenylpropanoids, phenolics and traces of carotenoids. Tracer experiments have shown that phenylalanine is a major precursor, but other carbon sources also contribute. It is likely that sporopollenin derives from several precursors that are chemically cross-linked to form a rigid structure. Electron microscopy shows that the tapetal cells that surround the developing pollen grain in the anther have a highly active secretory system containing lipophilic globules. These globules are believed to contain sporopollenin precursors. Chemical inhibitors of pollen development and many male sterile mutants have effects on the secretion of these globules by the tapetal cells.Sporopollenin has been applied in the nutrition and pharmaceutical fields, where it is claimed to have medicinal and health benefits".
- Q1067743 thumbnail Misc_pollen.jpg?width=300.
- Q1067743 wikiPageExternalLink contents.php?vol=49&issue=5-6&doi=052019lb.
- Q1067743 wikiPageWikiLink Q103129.
- Q1067743 wikiPageWikiLink Q132016.
- Q1067743 wikiPageWikiLink Q132560.
- Q1067743 wikiPageWikiLink Q133017.
- Q1067743 wikiPageWikiLink Q1414075.
- Q1067743 wikiPageWikiLink Q161219.
- Q1067743 wikiPageWikiLink Q170545.
- Q1067743 wikiPageWikiLink Q177332.
- Q1067743 wikiPageWikiLink Q180184.
- Q1067743 wikiPageWikiLink Q191069.
- Q1067743 wikiPageWikiLink Q191907.
- Q1067743 wikiPageWikiLink Q212919.
- Q1067743 wikiPageWikiLink Q271844.
- Q1067743 wikiPageWikiLink Q36133.
- Q1067743 wikiPageWikiLink Q407142.
- Q1067743 wikiPageWikiLink Q417181.
- Q1067743 wikiPageWikiLink Q420190.
- Q1067743 wikiPageWikiLink Q422649.
- Q1067743 wikiPageWikiLink Q61476.
- Q1067743 wikiPageWikiLink Q6951524.
- Q1067743 wikiPageWikiLink Q7188442.
- Q1067743 wikiPageWikiLink Q7214722.
- Q1067743 wikiPageWikiLink Q756.
- Q1067743 wikiPageWikiLink Q7692823.
- Q1067743 wikiPageWikiLink Q79932.
- Q1067743 wikiPageWikiLink Q8047.
- Q1067743 wikiPageWikiLink Q84230.
- Q1067743 wikiPageWikiLink Q999895.
- Q1067743 comment "Sporopollenin is one of the most chemically inert biological polymers. It is a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and is usually well preserved in soils and sediments.".
- Q1067743 label "Sporopollenin".
- Q1067743 depiction Misc_pollen.jpg.