Phylogeny and systematics of Indian Polygonum sensu lato in the subfamily Polygonoideae based on ITS sequences of nuclear ribosomal DNA

Abstract

ABSTRACT. The nuclear ribosomal DNA internal transcribed spacer (ITS) sequences from 44 Indian Polygonum taxa were examined to investigate relationships among various sections proposed by earlier researchers. The maximum parsimony trees obtained from analysis of the ITS sequences suggested eight major groups of the Indian Polygonum spp. The relationships among different sections were largely congruent with those inferred from morphological characters as described by Hooker. Also, the treatment of the Persicaria suggested by Haraldson on the basis of anatomical characters proved to be nearly in line with that based ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 11 (4): 4370-4382 (2012) Phylogenetic studies on Indian Polygonum sensu lato 4371 on our molecular data. We provide a high resolution of phylogeny of the Himalayan Polygonum sensu lato and support merger of the section Amblygonon in the section Persicaria. Moreover, we made the first phylogenetic analysis of many of the less known Himalayan Polygonums, including Polygonum microcephalum, P. assamicum, P. recumbens, and P. effusum. Molecular differences were detected among Persicaria barbata collected from different geographical locations of India, although these were not differentiated at the morphological level.

Phytochemical and biological research of Polygoneae medicinal resources

“…Hybridization events fostered by human introductions may be fueling the production of new species that have the potential to become aggressive weeds. ITS sequences from 44 Indian Polygonum taxa were examined to investigate relationships among various sections proposed previously (Choudhary et al, 2012). The maximum parsimony trees obtained from ITS sequences suggested eight major groups of the Indian Polygonum spp.…”

Phylogenomics, divergence time estimation, and adaptive evolution in the Polygonoideae (Polygonaceae)

“…The classification of Polygonum L. s. lat. in a broad sense has been the focus of systematic studies (Decraene & Smets, 1991; Hong et al, 2005; Choudhary et al, 2012). Due to morphological overlap and plasticity, there has been a significant change in the classification delimitations since its establishment (Kim & Donoghue, 2008; Schuster et al, 2015).…”

“…Several molecular studies have been undertaken in Polygonaceae or Polygonoideae, either using chloroplast markers (e.g., matK, ndhF, and rbcL), nuclear DNA marker (internal transcribed spacer [ITS]), or a combination of both (Sanchez et al, 2009;Schuster et al, 2015;Tantawy et al, 2020). The phylogenetic relationships among the major clades within the Polygonoideae have traditionally been a difficulty due to insufficient informative sites and a limited number of taxon sampling (Burke et al, 2010;Schuster et al, 2011Schuster et al, , 2015Choudhary et al, 2012;Zhang et al, 2021). Moreover, the circumscription of the Polygonoideae varied among taxonomists and the relationships of these subclades have not been fully taxonomically studied.…”

Plastid phylogenomics sheds light on divergence time and ecological adaptations of the tribe Persicarieae (Polygonaceae)

“…Whereas there is strong evidence for the monophyly of Persicarieae ( Schuster et al., 2013 ; Schuster et al., 2015 ), the delimitation of several contentious subclades remains particularly problematic. Although members of the genus Persicaria are usually easily recognized by the presence of an ocrea, nodes that are swollen in comparison to the axis, and quincuncial aestivation, some subgroups are difficult to identify because of overlapping character states and morphological plasticity ( Decraene and Smets, 2000 ; Choudhary et al., 2012 ; Fan et al., 2013 ; Paul and Chowdhury, 2021 ). Earlier studies considered Aconogonon , Bistorta , Koenigia , and Persicaria to be closely related genera, with roughly 200 known species worldwide ( Sanchez et al., 2009 ; Sanchez et al., 2011 ).…”