AOBPreview originally published online on August 28, 2008
Annals of Botany 2008 102(5):845-853; doi:10.1093/aob/mcn162
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Longevity, Lignin Content and Construction Cost of the Assimilatory Organs of Nepenthes Species
1 Department of Biology
2 Department of Chemistry, University of Brunei Darussalam, Jalan Tungku Link, Bandar Seri Begawan, Brunei Darussalam
* For correspondence. Present address: Alan Fletcher Research Station, Biosecurity Queensland, Department of Primary Industries & Fisheries, PO Box 36, Sherwood, Queensland 4075, Australia. E-mail Olusegun.Osunkoya{at}dpi.qld.gov.au or segun.osunkoya{at}gmail.com
Received: 10 June 2008 Returned for revision: 8 July 2008 Accepted: 29 July 2008 Published electronically: 29 August 2008
Background and Aims: This study examined level of causal relationships amongst functional traits in leaves and conjoint pitcher cups of the carnivorous Nepenthes species.
Methods: Physico-chemical properties, especially lignin content, construction costs, and longevity of the assimilatory organs (leaf and pitcher) of a guild of lowland Nepenthes species inhabiting heath and/or peat swamp forests of Brunei, northern Borneo were determined.
Key Results: Longevity of these assimilatory organs was linked significantly to construction cost, lignin content and structural trait of tissue density, but these effects are non-additive. Nitrogen and phosphorus contents (indicators of Rubisco and other photosynthetic proteins), were poor predictors of organ longevity and construction cost, suggesting that a substantial allocation of biomass of the assimilatory organs in Nepenethes is to structural material optimized for prey capture, rigidity and escape from biotic and abiotic stresses rather than to light interception. Leaf payback time – a measure of net carbon revenue – was estimated to be 48–60 d. This is in line with the onset of substantial mortality by 2–3 months of tagged leaves in many of the Nepenthes species examined. However, this is a high ratio (i.e. a longer minimum payback time) compared with what is known for terrestrial, non-carnivorous plants in general (5–30 d).
Conclusions: It is concluded that the leaf trait bivariate relationships within the Nepenthes genus, as in other carnivorous species (e.g. Sarraceniaceae), is substantially different from the global relationship documented in the Global Plant Trait Network.
Key words: Botanical carnivory, carbon gain, functional traits, leaf chemistry, leaf lifespan, leaf mass per unit area, Nepenthes, pitcher, payback time
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