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Australian Systematic Botany Australian Systematic Botany Society
Taxonomy, biogeography and evolution of plants
RESEARCH ARTICLE (Open Access)

Phyllodes and bipinnate leaves of Acacia exhibit contemporary continental-scale environmental correlation and evolutionary transition-rate heterogeneity

Matt A. M. Renner https://orcid.org/0000-0003-2286-7257 A E , Charles S. P. Foster https://orcid.org/0000-0002-6700-3746 B , Joseph T. Miller https://orcid.org/0000-0002-5788-9010 C and Daniel J. Murphy https://orcid.org/0000-0002-8358-363X D
+ Author Affiliations
- Author Affiliations

A National Herbarium of New South Wales, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Mrs Macquaries Road, Sydney, NSW 2000, Australia.

B School of Life and Environmental Sciences, University of Sydney, NSW 2006, Australia.

C Global Biodiversity Information Facility, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark.

D Royal Botanic Gardens Victoria, Birdwood Avenue, Melbourne, Vic. 3004, Australia.

E Corresponding author. Email: matt.renner@rbgsyd.nsw.gov.au

Australian Systematic Botany 34(6) 595-608 https://doi.org/10.1071/SB21009
Submitted: 6 April 2021  Accepted: 28 October 2021   Published: 3 December 2021

Journal compilation © CSIRO 2021 Open Access CC BY-NC-ND

Abstract

In Acacia, 90% of species have drought-tolerant phyllodes as their adult foliage, the remaining species have bipinnate leaves. We conducted tests for relationships between foliage type and 35 bioclimatic variables at the continental scale and found significant correlations of both ‘moisture seasonality’ and ‘radiation in the coldest quarter’ with foliage type. Bipinnate species have lower species mean values of each variable, growing in stable soil moisture and generally darker environments (longer nights and lower incident radiation), on average. Evolutionary transformations between bipinnate and phyllodinous adult foliage exhibit asymmetry across the Acacia phylogeny, with transformations from bipinnate leaves to phyllodes occurring times faster than the reverse. At least three (and up to seven) transitions from phyllode to bipinnate adult foliage were inferred. Foliage type in the most recent common ancestor of extant Acacia is unresolved, some analyses favour a phyllodinous ancestor, others a bipinnate ancestor. Most ancestral nodes inferred as having bipinnate adult foliage had median age estimates of less than 5 million years (Ma), half having ages between 3 and 1.5 Ma. Acacia lineages with bipinnate adult foliage diversified during the Pliocene, perhaps in response to wetter climatic conditions experienced by the continental margin during this period.


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