Polyploidization and apomixis contribute to taxonomic complexity in Anthosachne, a perennial genus native to Australia in the wheat tribe. Sha et al. performed a phylogenetic analysis to explore differentiation patterns of polyploidy amongst Australasian wheat relatives.
Chloroplast rbcL and trnH-psbA and nuclear Acc1 gene sequences of 60 Anthosachne taxa and 9 Roegneria species were analyzed with those of 33 diploid taxa representing 20 basic genomes in Triticeae. Anthosachne is shown to have originated as a result of historical hybridization between Australopyrum and Roegneria species. Greater diversity in island Anthosachne compared to continental Roegneria might correlate with genetic mutation, polyploidization, apomixes and expansion.
Sha, L.-N., Fan, X., Wang, X.-L., Dong, Z.-Z., Zeng, J., Zhang, H.-Q., … Zhou, Y.-H. (2016). Genome origin, historical hybridization and genetic differentiation in Anthosachne australasica (Triticeae; Poaceae), inferred from chloroplast rbc L, trn H- psb A and nuclear Acc1 gene sequences. Annals of Botany, 119(1), 95–107. https://doi.org/10.1093/aob/mcw222