Topic
Polygonum
About: Polygonum is a research topic. Over the lifetime, 1230 publications have been published within this topic receiving 12765 citations.
Papers published on a yearly basis
Papers
More filters
60 citations
TL;DR: In this article, the authors have isolated polygonal acid from leaves of Polygonum hydropiper together with four drimane-type sesquiterpenes, 11-ethoxycinnamolide, polygodial acetal, valdiviolide and fuegin.
60 citations
TL;DR: It is concluded that Eupersicaria is monophyletic and most closely related to Tovara and Echinocaulon, which supports the monophyly of the Persicarieae.
Abstract: Relationships within the Polygonaceae have been recently examined using rbcL sequences, with an emphasis on Polygonum and its segregates. Here we test these results with respect to Polygonum (sensu lato) with an expanded dataset, including additional species and gene regions. Specifically, we focus on inferring the relationships of Eupersicaria (Polygonum sect. Persicaria in many prior treatments), using the chloroplast genes rbcL, trnL-F, trnK intron-matK, and psbA-trnH IGS, and nuclear ribosomal ITS sequences. We conclude that Eupersicaria is monophyletic and most closely related to Tovara and Echinocaulon. In turn, this clade is most closely related to Cephalophilon. The sister group of this entire Persicaria clade contains Bistorta and a clade including Aconogonon and Koenigia, which supports the monophyly of the Persicarieae. Within Eupersicaria there appears to be a deep split between P. amphibia and the remaining species, and there is strong conflict regarding the placement of P. punctata. These results set the stage for a more detailed phylogenetic analysis of Eupersicaria.
60 citations
TL;DR: Results indicated that fungal strains had the main role in bioremediation of petroleum-polluted soils, but plant roots enhanced the process.
59 citations
TL;DR: The results obtained from this study are the basis for the formulation of seed germination models that predict not only the occurrence of seedling emergence in the field, but also the dynamics of germination within those periods.
Abstract: A screening method was used to characterize seed thermal responses of prostrate knotweed and common purslane, two important weeds invading wheat in the humid Pampa. Through this method, it was possible to detect thermal conditions that induce or break dormancy in both species. In addition, we were able to quantify changes in dormancy level in seed populations as a function of time of burial after dispersal, through changes in width of the thermal range within which germination can occur. Plotting the overlap of this thermal range and observed soil temperature throughout the year allowed the prediction of the seedling emergence period. This prediction was in agreement with observed seedling emergence in the field for both species, during 2 consecutive yr. From the analysis carried out under laboratory conditions, it was also possible to estimate required thermal time for germination of the nondormant fraction of the population and the base temperature above which thermal time is accumulated. The results obtained from this study are the basis for the formulation of seed germination models that predict not only the occurrence of seedling emergence in the field, but also the dynamics of germination within those periods.
57 citations