Salt- and alkaline-tolerance are linked in
            <i>Acacia</i>

Bui, Elisabeth N.; Thornhill, Andrew H.; Miller, Joe

doi:10.1098/rsbl.2014.0278

Cited by 35 publications

(33 citation statements)

References 24 publications

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“…Our results here using eucalypts and previously with Acacia (Bui, Gonzalez‐Orozco, et al., ; Bui, Thornhill, et al. ), and those of Merwin, He, and Lamont () using Banksia , support this hypothesis. Merwin et al.…”

Section: Discussionsupporting

confidence: 90%

Climate and geochemistry as drivers of eucalypt diversification in Australia

et al. 2017

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Eucalypts cover most of Australia. Here, we investigate the relative contribution of climate and geochemistry to the distribution and diversity of eucalypts. Using geostatistics, we estimate major element concentrations, pH, and electrical conductivity at sites where eucalypts have been recorded. We compare the median predicted geochemistry and reported substrate for individual species that appear associated with extreme conditions; this provides a partial evaluation of the predictions. We generate a site-by-species matrix by aggregating observations to the centroids of 100-km-wide grid cells, calculate diversity indices, and use numerical ecology methods (ordination, variation partitioning) to investigate the ecology of eucalypts and their response to climatic and geochemical gradients. We find that β-diversity coincides with variations in climatic and geochemical patterns. Climate and geochemistry together account for less than half of the variation in eucalypt species assemblages across Australia but for greater than 80% in areas of high species richness. Climate is more important than geochemistry in explaining eucalypts species distribution and change in assemblages across Australia as a whole but there are correlations between the two sets of environmental variables. Many individual eucalypt species and entire taxonomic sections (Aromatica, Longistylus of subgenus Eucalyptus, Dumaria, and Liberivalvae of subgenus Symphyomyrtus) have distributions affected strongly by geochemistry. We conclude that eucalypt diversity is driven by steep geochemical gradients that have arisen as climate patterns have fluctuated over Australia over the Cenozoic, generally aridifying since the Miocene. The diversification of eucalypts across Australia is thus an excellent example of co-evolution of landscapes and biota in space and time and challenges accepted notions of macroecology.

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Section: Discussionsupporting

confidence: 90%

Climate and geochemistry as drivers of eucalypt diversification in Australia

et al. 2017

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“…S6), suggesting geography cannot explain the difference. Throughout the past 25 Myr, salinity and alkalinity tolerance have evolved repeatedly in Acacia , and range‐restricted species are often tolerant of extreme geochemistry (Bui et al , ). This capacity for physiological adaptation may explain differences in diversification rate if salinity and alkalinity tolerance evolved more frequently in ES 1 and ES 2 than in ES 0.…”

Section: Discussionmentioning

confidence: 99%

Increased diversification rates are coupled with higher rates of climate space exploration in Australian Acacia (Caesalpinioideae)

et al. 2020

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Summary Australia is an excellent setting to explore relationships between climate change and diversification dynamics. Aridification since the Eocene has resulted in spectacular radiations within one or more Australian biomes. Acacia is the largest plant genus on the Australian continent, with around 1000 species, and is present in all biomes. We investigated the macroevolutionary dynamics of Acacia within climate space. We analysed phylogenetic and climatic data for 503 Acacia species to estimate a time‐calibrated phylogeny and central climatic tendencies for BioClim layers from 132 000 herbarium specimens. Diversification rate heterogeneity and rates of climate space exploration were tested. We inferred two diversification rate increases, both associated with significantly higher rates of climate space exploration. Observed spikes in climate disparity within the Pleistocene correspond with onset of Pleistocene glacial–interglacial cycling. Positive time dependency in environmental disparity applies in the basal grade of Acacia, though climate space exploration rates were lower. Incongruence between rates of climate space exploration and disparity suggests different Acacia lineages have experienced different macroevolutionary processes. The second diversification rate increase is associated with a south‐east Australian mesic lineage, suggesting adaptations to progressively aridifying environments and ability to transition into mesic environments contributed to Acacia's dominance across Australia.

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“…For example, the distribution of Acacia species across saline and alkaline environments is strongly influenced by evolutionary history (Bui et al. ). Likewise, rhizobial abundance and diversity can be strongly influenced by edaphic conditions [e.g., soil pH and fertility, salinity, temperature, and rainfall (Alexander et al.…”

Section: Discussionmentioning

confidence: 99%

Evolutionary history shapes patterns of mutualistic benefit in Acacia –rhizobial interactions

et al. 2016

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The ecological and evolutionary factors that drive the emergence and maintenance of variation in mutualistic benefit (i.e., the benefits provided by one partner to another) in mutualistic symbioses are not well understood. In this study, we evaluated the role that host and symbiont phylogeny might play in determining patterns of mutualistic benefit for interactions among nine species of Acacia and 31 strains of nitrogen-fixing rhizobial bacteria. Using phylogenetic comparative methods we compared patterns of variation in mutualistic benefit (host response to inoculation) to rhizobial phylogenies constructed from housekeeping and symbiosis genes; and a multigene host phylogeny. We found widespread genotype-by-genotype variation in patterns of plant growth. A relatively large component of this variation (21-28%) was strongly influenced by the interacting evolutionary histories of both partners, such that phylogenetically similar host species had similar growth responses when inoculated with phylogenetically similar rhizobia. We also found a relatively large nonphylogenetic effect for the average mutualistic benefit provided by rhizobia to plants, such that phylogenetic relatedness did not predict the overall benefit provided by rhizobia across all hosts. We conclude that phylogenetic relatedness should frequently predict patterns of mutualistic benefit in acacia-rhizobial mutualistic interactions; but that some mutualistic traits also evolve independently of the phylogenies.

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Salt- and alkaline-tolerance are linked in Acacia

Cited by 35 publications

References 24 publications

Climate and geochemistry as drivers of eucalypt diversification in Australia

Climate and geochemistry as drivers of eucalypt diversification in Australia

Increased diversification rates are coupled with higher rates of climate space exploration in Australian Acacia (Caesalpinioideae)

Evolutionary history shapes patterns of mutualistic benefit in Acacia –rhizobial interactions

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