Abstract
Chemical evolutionary pathways operating in the subclass Asteridae have been critically assessed. The different groups of plants are found to experiment with the various plant products such as alkaloids, cardiac glycosides, tannins, volatile oils, quinones and iridoids. Compounds which help plants to combat pathogens, discourage herbivores and act as allelochemics are found to provide a selective advantage to those individuals that possess them. Compounds providing little or no selective advantage are discarded. Trends in the chemical evolution of Asteridae are (i) reduction/elimination of alkaloids, flavonols and proanthocyanidins/tannins, (ii) introduction and further methoxylation of 6-deoxy and 6-oxyflavones, (iii) introduction of iridoids especially aucubins, (iv) development of volatile oils rich in sesquiterpenes, and (v) increased reliability on quinones as antimicrobials and allilochemics. The advanced groups of Asteridae possess a specific assortment of antimicrobials, bitter substances and allelochemics. The classification within the Asteridae is examined in the light of these trends.
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Claims 9
Claim · model-written summary
Plant products vary among groups of Asteridae.
- Outcome
- various plant productse0
Verbatim
e0“The different groups of plants are found to experiment with the various plant products such as alkaloids, cardiac glycosides, tannins, volatile oils, quinones and iridoids”
t0“Asteridae”
Claim · model-written summary
Compounds that combat pathogens, deter herbivores or act as allelochemicals provide selective advantage.
Verbatim
e0“Compounds which help plants to combat pathogens, discourage herbivores and act as allelochemics are found to provide a selective advantage to those individuals that possess them”
t0“Asteridae”
Claim · model-written summary
Compounds with little or no selective advantage are discarded.
- Outcome
- discardede0
Verbatim
e0“Compounds providing little or no selective advantage are discarded”
t0“Asteridae”
Claim · model-written summary
Asteridae show reduction or elimination of alkaloids, flavonols and proanthocyanidins or tannins.
- Outcome
- reduction/elimination of alkaloids, flavonols and proanthocyanidins/tanninse0
Verbatim
e0“reduction/elimination of alkaloids, flavonols and proanthocyanidins/tannins”
t0“Asteridae”
Claim · model-written summary
Asteridae show introduction and further methoxylation of 6-deoxy and 6-oxyflavones.
- Outcome
- introduction and further methoxylation of 6-deoxy and 6-oxyflavonese0
Verbatim
e0“introduction and further methoxylation of 6-deoxy and 6-oxyflavones”
t0“Asteridae”
Claim · model-written summary
Asteridae show introduction of iridoids, especially aucubins.
- Outcome
- introduction of iridoids especially aucubinse0
Verbatim
e0“introduction of iridoids especially aucubins”
t0“Asteridae”
Claim · model-written summary
Asteridae developed volatile oils rich in sesquiterpenes.
- Outcome
- development of volatile oils rich in sesquiterpenese0
Verbatim
e0“development of volatile oils rich in sesquiterpenes”
t0“Asteridae”
Claim · model-written summary
Asteridae increasingly rely on quinones as antimicrobials and allelochemicals.
- Outcome
- increased reliability on quinones as antimicrobials and allilochemicse0
Verbatim
e0“increased reliability on quinones as antimicrobials and allilochemics”
t0“Asteridae”
Claim · model-written summary
Advanced Asteridae groups possess a specific assortment of antimicrobials, bitter substances and allelochemicals.
- Outcome
- specific assortment of antimicrobials, bitter substances and allelochemicse0
Verbatim
e0“The advanced groups of Asteridae possess a specific assortment of antimicrobials, bitter substances and allelochemics”