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 components follows the overall traces of plant relationships. although, it quickly turned transparent that little was once to be won from the examine of person compounds and their usual distribu tion. as a result, extra accomplished stories have been try out ed during which the secondary chemistry of an incredible plant team was once rigorously studied and evaluated within the broader context of comparative phytochemistry. Holger Erdtman's admir capable paintings on Coniferae is the key instance of this sort. given that then, there was an upswing within the examine of the biosynthesis of secondary plant ingredients and it has turn into really universal to use biosynthetic wisdom in reading chemosystematic proof. extra over, on the grounds that taxonomists have insisted that use be made up of all very likely on hand proof for construction classifications, it's been claimed that chemosystematics too should still con sider the entire array of ingredients found in an enormous taxon. notwithstanding, in perform it has proved tough to make use of absolutely the possibility of normal product chemistry and biosynthetic reviews for plant systematics and evolution, simply because bota nists came across themselves quite disorientated by way of the scattered, usually hardly ever obtainable chemical literature and the truth that the chemical facts was once tough for them to judge! even if the pioneering paintings of E. C.
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Extra resources for Micromolecular Evolution, Systematics and Ecology: An Essay into a Novel Botanical Discipline
Example text
Number of derivatives of codified (cf. 1) reported up to the beginning of 1978, BTIQ-derived alkaloids accumulate in a chemosystematically significant manner only in Magnoliiflorae and Ranunculiflorae. Other highly modified phenylalanine derived alkaloids appear in Caryophylliflorae and Liliiflorae. All these superorders are placed close together in Dahlgren's (1980) graphical system of classification of the angiosperms (Fig. 2). 1), are general and, hence, primitive characters of the benzylisoquinoline biogenetic group.
7. Evolution of systematically significant allelochemics in angiosperm superorders (sensu Dahlgren 1980). j>. til .... 'o·" S .... CD '< til I:l. til '"i:l ~ .... S tn· (') 46 Evolution of Allelochemics in Angiospermae and phenylalanine, anthranilate and gallate, mevalonate and acetate for the production of allelochemics in flowering plants occurs in three separate levels. This is an encouraging result since it is consistent with the division of the angiosperms into the three major groups Magnoliidae - Caryophyllidae - (Liliatae); Rosidae - Dilleniidae - Hamamelidae; and Asteridae (sensu Cronquist 1968).
The emergence of plant life from water to dry land (Chap. 3) was conditioned by these molecular types, both stemming from an identical precursor. CHAPTER 5 Evolution of Allelochemics in Angiospermae Primitive angiosperms may owe their woody habit to a gymnosperm-type ancestry. Gymnosperms, in which, significantly, alkaloids are rare, possess the metabolic pathway sugar ~ shikimic acid ~ chorismic acid ~ phenylalanine ~ cinnamic acid ~ cinnamyl alcohol (Fig. 1), and derive substantial quantities of lignins from cinnamyl alcohols and condensed tannins from cinnamic acids.