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Variation in leaf wax n-alkane characteristics with climate in the broad-leaved paperbark (Melaleuca quinquenervia)

Lookup NU author(s): Dr Andrew Henderson

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

© 2019 Elsevier Ltd In higher plants, leaf waxes provide a barrier to non-stomatal water loss, and their composition varies both between and within species. Characteristics of n-alkanes, a suite of ubiquitous compounds in these waxes, are thought to be influenced by the availability of water and the temperature in a plant's growing environment. Longer n-alkane distributions with less variability in chain length are hypothesised to confer greater resistance to non-stomatal water loss and thus are expected in higher abundance in desiccating environments. Relationships between the distribution of n-alkanes and both precipitation and temperature have previously been observed. Despite this, it is unclear whether n-alkane chain length distributions vary plastically in response to climate, or whether they are fixed within populations in different climate settings. To better understand this, we examine the relationship between n-alkane characteristics of Melaleuca quinquenervia and both spatial and temporal climate variation. Across eastern Australia, we find that n-alkane homolog concentrations and distributions in leaves of M. quinquenervia do not vary with climate where samples are proximate, even when climate shows significant variability. However, the concentration and distribution of n-alkane homologs do differ considerably between geographically separated populations in very different climate regimes. These results suggest n-alkane characteristics are not a plastic response to climate variability, and instead are likely fixed and could be driven by genetic differences between populations. This has important implications for the use of n-alkane characteristics as palaeoenvironmental proxies.


Publication metadata

Author(s): Andrae JW, McInerney FA, Tibby J, Henderson ACG, Hall PA, Marshall JC, McGregor GB, Barr C, Greenway M

Publication type: Article

Publication status: Published

Journal: Organic Geochemistry

Year: 2019

Volume: 130

Pages: 33-42

Print publication date: 01/04/2019

Online publication date: 11/02/2019

Acceptance date: 10/02/2019

Date deposited: 16/04/2019

ISSN (print): 0146-6380

ISSN (electronic): 1873-5290

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.orggeochem.2019.02.004

DOI: 10.1016/j.orggeochem.2019.02.004


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