Abstract Detail


Dowell, Jordan [1], Mason, Chase [2].

Correlation in plant volatile metabolites: physiochemical properties as a proxy for enzymatic pathways and an alternative metric of biosynthetic constraint.

From intra-individual regulation of metabolism to entire ecosystem functioning, the millions of biogenic compounds produced by organisms serve as a major component of ecological and evolutionary diversity mediating interactions across scales. Earlier work considers canonical reactions, defined as reactions specified along accepted (experimentally validated or theoretically postulated) biosynthetic pathways, as the primary form of constraint on chemical diversity. An emerging understanding of non-canonical reactions (reactions which occur independently of canonical reactions) suggests that the physical chemistry of compounds may play a larger role in constraining chemo-diversity than previously thought. We selected 25 studies of plant volatile profiles, satisfying a defined set of criteria, to assess the extent of correlation among profiles attributable to either shared biosynthetic enzymes or physiochemical properties. Across studies, regardless of treatment, 0.17 (± 0.16 SD) adjusted R2 was attributed to both shared biosynthetic enzymes and physiochemical properties, however there were no significant differences between the amount of unique variance attributed to shared enzymes (0.05 ± 0.08 SD) or physiochemical properties (0.03 ± 0.06 SD). The amount of unique variance explained by physiochemical properties, independent of their canonical relationships, provides a metric for evaluating the role of non-enzymatic and non-canonical reactions in constraining molecular diversity.  

1 - University of Central Florida, Department of Biology, 4110 Libra Dr., Orlando, FL, 32816, United States
2 - University Of Central Florida, Department Of Biology, 4110 Libra Dr, Orlando, FL, 32816, United States

biosynthetic constraint
comparative methods
specialized metabolism
enzyme promiscuity.

Presentation Type: Oral Paper
Session: ECOPH3, Ecophysiology III
Location: Virtual/Virtual
Date: Thursday, July 30th, 2020
Time: 4:15 PM
Number: ECOPH3006
Abstract ID:576
Candidate for Awards:Physiological Section Best Paper Presentation

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