ORCID Profile
0000-0002-6754-8201
Current Organisation
National Institute of Fundamental Studies
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Publisher: Springer Science and Business Media LLC
Date: 12-09-2022
DOI: 10.1038/S41467-022-32637-X
Abstract: Species radiations, despite immense phenotypic variation, can be difficult to resolve phylogenetically when genetic change poorly matches the rapidity of ersification. Genomic potential furnished by palaeopolyploidy, and relative roles for adaptation, random drift and hybridisation in the apportionment of genetic variation, remain poorly understood factors. Here, we study these aspects in a model radiation, Syzygium , the most species-rich tree genus worldwide. Genomes of 182 distinct species and 58 unidentified taxa are compared against a chromosome-level reference genome of the sea apple, Syzygium grande . We show that while Syzygium shares an ancient genome doubling event with other Myrtales, little evidence exists for recent polyploidy events. Phylogenomics confirms that Syzygium originated in Australia-New Guinea and ersified in multiple migrations, eastward to the Pacific and westward to India and Africa, in bursts of speciation visible as poorly resolved branches on phylogenies. Furthermore, some sublineages demonstrate genomic clines that recapitulate cladogenetic events, suggesting that stepwise geographic speciation, a neutral process, has been important in Syzygium ersification.
Publisher: Wiley
Date: 06-2002
Publisher: Magnolia Press
Date: 10-08-2021
DOI: 10.11646/PHYTOTAXA.514.1.2
Abstract: Strobilanthes medahinnensis, a new species of Acanthaceae is described and illustrated from Sri Lanka. The new species is similar to S. anceps in having ovate leaves, yellow gland dots of abaxial leaf surface and reflexed bracts but differs by rounded stem, leaves with acuminate apex, elongated spikes, lanceolate outermost bract with long acuminate apex. The establishment of the new species is supported by complete plastome genome analyses.
Publisher: Wiley
Date: 13-12-2021
Abstract: Some of the largest expanses of ultramafic soils occur in South Asia, but knowledge of the plant ersity and biogeochemistry of these systems in Sri Lanka is very limited. This study aimed to assess the plant ersity and bedrock and foliar chemistry of all known Sri Lankan ultramafic outcrops. The field survey yielded a total of 132 plant taxa from 44 families. The enigmatic nickel hyperaccumulator Rinorea bengalensis (Violaceae), first reported in Sri Lanka over four decades ago, was rediscovered at a newly surveyed ultramafic site, however, it did not hyperaccumulate nickel. No new metal hyperaccumulator plants were identified, suggesting that R. bengalensis is a facultative nickel hyperaccumulator. This study is the first to highlight the floristic ersity of all known Sri Lankan ultramafic outcrops while revealing the facultative nature of nickel and copper hyperaccumulation among some of Sri Lanka's ultramafic plants.
No related grants have been discovered for Siril Wijesundara.