By Professor Dr. Otto Richard Gottlieb (auth.)
For a number of a long time botanists were inspired via the invention that the distribution of secondary plant ingredients follows the overall strains of plant relationships. besides the fact that, it quickly turned transparent that little was once to be received from the learn of person compounds and their average distribu tion. accordingly, extra finished reviews have been test ed within which the secondary chemistry of an enormous plant staff was once conscientiously studied and evaluated within the broader context of comparative phytochemistry. Holger Erdtman's admir capable paintings on Coniferae is the main instance of this type. seeing that then, there was an upswing within the examine of the biosynthesis of secondary plant ingredients and it has develop into rather widely used to use biosynthetic wisdom in analyzing chemosystematic facts. extra over, given that taxonomists have insisted that use be made up of all almost certainly to be had proof for construction classifications, it's been claimed that chemosystematics too may still con sider the total array of ingredients found in an incredible taxon. notwithstanding, in perform it has proved tricky to make use of absolutely the possibility of ordinary product chemistry and biosynthetic reviews for plant systematics and evolution, simply because bota nists came across themselves particularly disorientated via the scattered, usually not often available chemical literature and the truth that the chemical facts was once tough for them to guage! even though the pioneering paintings of E. C.
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Additional resources for Micromolecular Evolution, Systematics and Ecology: An Essay into a Novel Botanical Discipline
The reappearance of volatile terpenoids in advanced monocotyledons was noted above. Evolution of lsopentanylated Phenolics The ortho or para substitution of a phenolic nucleus by methyl, benzyl, cinnamyl or prenyl moieties leads to derivatives (respectively la-d in Fig. 6) whose oxidation would yield QJi-unsaturated ketones (respectively 2a-d). The reactivity of this functional group towards nucleophiles is well known and the substitution reactions are thus expected to enhance the biological activity of phenolics (cf.
The entire story is then envisaged as a case of progressive switch-overs in which groups with similar reactivity or structure, and hence possibly possessing similar, though unknown, allelochemical functions, arise by different biosynthetic pathways conforming with evolutionary pressure. The incidence of the isopentanylation reaction already suggests the affinity of the Rutiflorae, Santaliflorae, Araliiflorae, and Asteriflorae, superorders which form an evolutionary line characterized by the presence of polyacetylenes (Fig.
Such an endeavour must dispense with Sporne indices which are based on different systems (Sporne 1974, 1980) for the two divisions of this class. g. by an EAF/EAA correlation (Fig. 8). This demonstrates the existence of three pathways of flavonoid evolution spreading from a hypothetical flavonoid complex, a 5,7-dioxygenated flavone-flavonol mixture with a respective structural variability of about 2:8. The pathways are distinguished by the rates of flavone variation (EAF values) and ring A oxygenation (EA A values).
Micromolecular Evolution, Systematics and Ecology: An Essay into a Novel Botanical Discipline by Professor Dr. Otto Richard Gottlieb (auth.)