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Seed polyphenols in a diverse tropical plant community

Gripenberg, Sofia; Rota, Jadranka LU ; Kim, Jorma; Wright, S. Joseph; Garwood, Nancy C.; Fricke, Evan C.; Zalamea, Paul Camilo and Salminen, Juha Pekka (2018) In Journal of Ecology 106(1). p.87-100
Abstract

Polyphenols are one of the most common groups of secondary metabolites in plants and thought to play a key role in enhancing plant fitness by protecting plants against enemies. Although enemy-inflicted mortality at the seed stage can be an important regulator of plant populations and a key determinant of community structure, few studies have assessed community-level patterns of polyphenol content in seeds. We describe the distribution of the main seed polyphenol groups across 196 tree and liana species on Barro Colorado Island (Panama) and community-level patterns in two aspects of their biological activity (protein precipitation and oxidative capacity). Taking advantage of substantial variation in morphological and ecological traits in... (More)

Polyphenols are one of the most common groups of secondary metabolites in plants and thought to play a key role in enhancing plant fitness by protecting plants against enemies. Although enemy-inflicted mortality at the seed stage can be an important regulator of plant populations and a key determinant of community structure, few studies have assessed community-level patterns of polyphenol content in seeds. We describe the distribution of the main seed polyphenol groups across 196 tree and liana species on Barro Colorado Island (Panama) and community-level patterns in two aspects of their biological activity (protein precipitation and oxidative capacity). Taking advantage of substantial variation in morphological and ecological traits in the studied plant community, we test for correlations and trade-offs between seed polyphenols and nonchemical plant traits hypothesised to make plant species more or less likely to invest in polyphenol production. The majority of species have polyphenols in their seeds. The incidence and concentrations of polyphenols were related to a set of nonchemical plant traits. Polyphenols were most likely to be present (and where present, to be expressed in high concentrations) in species with large seeds, short seed dormancy times, low investment in mechanical seed defences, high wood density, high leaf mass per area, tough leaves and slow growth rates. Synthesis. Our study reveals a potential trade-off between chemical and mechanical seed defences and shows that plant species that invest in physical defences at later life stages (high wood density and tough leaves) tend not to invest in physical defences of seeds but instead produce secondary metabolites likely to act as seed defences. Overall, our results conform to predictions from the resource availability hypothesis, which states that species in resource-limited environments (such as slow-growing shade-tolerant tree species) will invest more in defences than fast-growing pioneer species.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Barro Colorado Island, Chemical seed defences, Determinants of plant community diversity and structure, Macroevolution of plant defences, Plant apparency theory, Resource availability hypothesis, Tannins
in
Journal of Ecology
volume
106
issue
1
pages
87 - 100
publisher
Wiley-Blackwell
external identifiers
  • scopus:85021206004
  • wos:000417839700007
ISSN
0022-0477
DOI
10.1111/1365-2745.12814
language
English
LU publication?
yes
id
5d731d36-8327-4756-9db8-7a92e671f188
date added to LUP
2017-07-13 08:12:26
date last changed
2018-02-19 01:51:54
@article{5d731d36-8327-4756-9db8-7a92e671f188,
  abstract     = {<p>Polyphenols are one of the most common groups of secondary metabolites in plants and thought to play a key role in enhancing plant fitness by protecting plants against enemies. Although enemy-inflicted mortality at the seed stage can be an important regulator of plant populations and a key determinant of community structure, few studies have assessed community-level patterns of polyphenol content in seeds. We describe the distribution of the main seed polyphenol groups across 196 tree and liana species on Barro Colorado Island (Panama) and community-level patterns in two aspects of their biological activity (protein precipitation and oxidative capacity). Taking advantage of substantial variation in morphological and ecological traits in the studied plant community, we test for correlations and trade-offs between seed polyphenols and nonchemical plant traits hypothesised to make plant species more or less likely to invest in polyphenol production. The majority of species have polyphenols in their seeds. The incidence and concentrations of polyphenols were related to a set of nonchemical plant traits. Polyphenols were most likely to be present (and where present, to be expressed in high concentrations) in species with large seeds, short seed dormancy times, low investment in mechanical seed defences, high wood density, high leaf mass per area, tough leaves and slow growth rates. Synthesis. Our study reveals a potential trade-off between chemical and mechanical seed defences and shows that plant species that invest in physical defences at later life stages (high wood density and tough leaves) tend not to invest in physical defences of seeds but instead produce secondary metabolites likely to act as seed defences. Overall, our results conform to predictions from the resource availability hypothesis, which states that species in resource-limited environments (such as slow-growing shade-tolerant tree species) will invest more in defences than fast-growing pioneer species.</p>},
  author       = {Gripenberg, Sofia and Rota, Jadranka and Kim, Jorma and Wright, S. Joseph and Garwood, Nancy C. and Fricke, Evan C. and Zalamea, Paul Camilo and Salminen, Juha Pekka},
  issn         = {0022-0477},
  keyword      = {Barro Colorado Island,Chemical seed defences,Determinants of plant community diversity and structure,Macroevolution of plant defences,Plant apparency theory,Resource availability hypothesis,Tannins},
  language     = {eng},
  number       = {1},
  pages        = {87--100},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Ecology},
  title        = {Seed polyphenols in a diverse tropical plant community},
  url          = {http://dx.doi.org/10.1111/1365-2745.12814},
  volume       = {106},
  year         = {2018},
}