Topic
Nymphaea
About: Nymphaea is a research topic. Over the lifetime, 210 publications have been published within this topic receiving 2637 citations. The topic is also known as: the water lily genus.
Papers published on a yearly basis
Papers
TL;DR: The Nymphaea mitogenome resembles the other available early angiosperm mitogenomes by a similarly rich 64-coding gene set, and many conserved gene clusters, whereas stands out by its highly repetitive nature and resultant remarkable intron expansions.
Abstract: Mitochondrial genomes of flowering plants (angiosperms) are highly dynamic in genome structure. The mitogenome of the earliest angiosperm Amborella is remarkable in carrying rampant foreign DNAs, in contrast to Liriodendron, the other only known early angiosperm mitogenome that is described as ‘fossilized’. The distinctive features observed in the two early flowering plant mitogenomes add to the current confusions of what early flowering plants look like. Expanded sampling would provide more details in understanding the mitogenomic evolution of early angiosperms. Here we report the complete mitochondrial genome of water lily Nymphaea colorata from Nymphaeales, one of the three orders of the earliest angiosperms. Assembly of data from Pac-Bio long-read sequencing yielded a circular mitochondria chromosome of 617,195 bp with an average depth of 601×. The genome encoded 41 protein coding genes, 20 tRNA and three rRNA genes with 25 group II introns disrupting 10 protein coding genes. Nearly half of the genome is composed of repeated sequences, which contributed substantially to the intron size expansion, making the gross intron length of the Nymphaea mitochondrial genome one of the longest among angiosperms, including an 11.4-Kb intron in cox2, which is the longest organellar intron reported to date in plants. Nevertheless, repeat mediated homologous recombination is unexpectedly low in Nymphaea evidenced by 74 recombined reads detected from ten recombinationally active repeat pairs among 886,982 repeat pairs examined. Extensive gene order changes were detected in the three early angiosperm mitogenomes, i.e. 38 or 44 events of inversions and translocations are needed to reconcile the mitogenome of Nymphaea with Amborella or Liriodendron, respectively. In contrast to Amborella with six genome equivalents of foreign mitochondrial DNA, not a single horizontal gene transfer event was observed in the Nymphaea mitogenome. The Nymphaea mitogenome resembles the other available early angiosperm mitogenomes by a similarly rich 64-coding gene set, and many conserved gene clusters, whereas stands out by its highly repetitive nature and resultant remarkable intron expansions. The low recombination level in Nymphaea provides evidence for the predominant master conformation in vivo with a highly substoichiometric set of rearranged molecules.
192 citations
TL;DR: Phylogenetic analyses of the chloroplast DNA of Nymphaea alba revealed consistent support for Nympholia being a divergent member of a monophyletic dicot assemblage and observations suggesting that the monocot lineage leading to the grasses has the strongest phylogenetic affinity to gymnosperms have general implications for studies of substitution model specification and analyses of concatenated genome data.
Abstract: Angiosperms (flowering plants) dominate contemporary terrestrial flora with roughly 250,000 species, but their origin and early evolution are still poorly understood. In recent years, molecular evidence has accumulated suggesting a dicotyledonous origin of monocots. Phylogenetic reconstructions have suggested that several dicotyledonous groups that include taxa such as Amborella, Austrobaileya, and Nymphaea branch off as the most basal among angiosperms. This has led to the concept of monocots, "eudicots," "basal dicots," and "ANITA" groupings. Here, we present the sequence and phylogenetic analyses of the chloroplast DNA of Nymphaea alba. Phylogenetic analyses of our 14-species data set, consisting of 29,991 aligned nucleotide positions per chloroplast genome, revealed consistent support for Nymphaea being a divergent member of a monophyletic dicot assemblage. Three distinct angiosperm lineages were supported in the majority of our phylogenetic analyses-eudicots, Magnoliopsida, and monocots. However, the monocot lineage leading to the grasses was the deepest branching. Although analyses of only one individual gene alignment (out of 61) is consistent with some recently proposed hypotheses for the paraphyly of dicots, we also report observations that nine genes do not support paraphyly of dicots. Instead, they support the basal monocot-dicot split. Consistent with this finding, we also report observations suggesting that the monocot lineage leading to the grasses has the strongest phylogenetic affinity to gymnosperms. Our findings have general implications for studies of substitution model specification and analyses of concatenated genome data.
129 citations
TL;DR: Phylogenetic relationships among 35 of an estimated 45–50 species of Nymphaea are presented based on an analysis of the chloroplast trnT‐trnF region, showing a strong insertion bias in simple sequence repeats and AT‐rich, satellite‐like sequence parts that seem to be conserved in sequence within species but are highly variable among species.
Abstract: Nymphaea is the most speciose, phenotypically diverse, and geographically widespread (nearly global) genus of Nymphaeales. Phylogenetic relationships among 35 of an estimated 45–50 species of Nymphaea are presented based on an analysis of the chloroplast trnT‐trnF region. Because this is the first phylogenetic analysis of Nymphaea, monophyly of the genus had to be tested, and its status in Nymphaeales had to be inferred. Rooting was therefore extended to more distant outgroups (Amborella, Austrobaileyales). Monophyly of Nymphaea received weak support, with a Euryale‐Victoria clade appearing as sister. The three major lineages within Nymphaea are constituted by the northern temperate subg. Nymphaea that is sister to all remaining species, a subgg. Hydrocallis‐Lotos clade, and a subgg. Anecphya‐Brachyceras clade. The Australian genus Ondinea was nested at species level within Nymphaea subg. Anecphya. The pantropical subg. Brachyceras as currently circumscribed does not appear natural, with Nymphaea petersia...
121 citations
TL;DR: The similarity of zooplankton communities in Wielkowiejskie lake was based on the characteristic architecture of particular macrophyte species, where the plant length was the strongest predictor.
Abstract: Research on the similarity of zooplankton in various stands of water vegetation, including rushes (Typha angustifolia), nymphaeids (Nymphaea alba) and submerged macrophytes (Charahispida, C. tomentosa, Myriophyllumverticillatum and Utricularia vulgaris) was carried out on the shallow Wielkowiejskie lake (Poland). The analysis of the similarity of the Rotifera community revealed the strongest relationship between the Myriophyllum and Chara tomentosa beds, with C. hispida attaching them. A second pair of habitats was represented by Typha and Nymphaea stands. Cladocerans revealed the greatest similarity between both zones of Chara. Additionally, two more pairs of habitats were distinguished – Typha and Nymphaea and also Utricularia and Myriophyllum. In most cases, the Shannon-Weaver values were high among macrophyte stations. Forward stepwise regression revealed that the length of Nymphaea stems was a single negative predictor determining the Cladocera densities. The water lily stand possessed the richest pelagic community of zooplankton and had the highest cladoceran diversity index. In accordance with CCA-ordination, out of the environmental variables, the macrophyte stem length and the concentration of Ptot were the strongest predictors in determining the distribution of particular species of the zooplankton community. Mainly pelagic species displayed preferences towards physical parameters of habitat, which is manifested in their greater affinity to a denser spatial structure of macrophyte substratum. The similarity of zooplankton communities in Wielkowiejskie lake was based on the characteristic architecture of particular macrophyte species, where the plant length was the strongest predictor. Moreover, the character of the zooplankton communities was also influenced by the concentrations of chlorophyll ‘a’ and the chemical variables, with the strongest impact of Ptot, of periphyton received from a particular macrophyte habitat and from water filling the spaces between plant stems.
119 citations
TL;DR: This study will improve the understanding of the molecular mechanism of blue flowers in waterl Lily and provide the basis for molecular breeding of blue hardy waterlily cultivars.
Abstract: Waterlily (Nymphaea spp.), a perennial herbaceous aquatic plant, is divided into two ecological groups: hardy waterlily and tropical waterlily. Although the hardy waterlily has no attractive blue flower cultivar, its adaptability is stronger than tropical waterlily because it can survive a cold winter. Thus, breeding hardy waterlily with real blue flowers has become an important target for breeders. Molecular breeding may be a useful way. However, molecular studies on waterlily are limited due to the lack of sequence data. In this study, six cDNA libraries generated from the petals of two different coloring stages of blue tropical waterlily cultivar Nymphaea ‘King of Siam’ were sequenced using the Illumina HiSeq™ 2500 platform. Each library produced no less than 5.65 Gb clean reads. Subsequently, de novo assembly generated 112,485 unigenes, including 26,206 unigenes annotated to seven public protein databases. Then, 127 unigenes could be identified as putative homologues of color-related genes in other species, including 28 up-regulated and 5 down-regulated unigenes. In petals, 16 flavonoids (4 anthocyanins and 12 flavonols) were detected in different contents during the color development due to the different expression levels of color-related genes, and four flavonols were detected in waterlily for the first time. Furthermore, UA3GTs were selected as the most important candidates involved in the flavonoid metabolic pathway, UA3GTs induced blue petal color formation in Nymphaea ‘King of Siam’. This study will improve our understanding of the molecular mechanism of blue flowers in waterlily and provide the basis for molecular breeding of blue hardy waterlily cultivars.
117 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 5 |
| 2020 | 6 |
| 2019 | 8 |
| 2018 | 5 |
| 2017 | 7 |
| 2016 | 9 |