The genetic diversity of Paeonia L.

Ji, Lijing; Qi, Wang; Silva, Jaime A. Teixeira da; Yu, Xiao

doi:10.1016/j.scienta.2012.06.011

Cited by 40 publications

(32 citation statements)

References 39 publications

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“…In earlier work, agglomeration was observed above 2 wt% particle, which resulted in electrospun fibers with beads and irregular morphology. [16] With the present in situ silication process, TGA analysis revealed that silica particle loading in PCL nanofibers was 4 wt% and 3 wt% by using citric acid and acetic acid, respectively, as the catalyst. However, the presence of either citric acid or silica particles resulted in decrease of the elastic modulus as observed for PCL/C and PCL/CÀSi.…”

Section: Discussionmentioning

confidence: 85%

“…It was reported that the increase in silica content above 2 wt% resulted in particle agglomeration that led to the formation of electrospun fibers with beads and irregular morphology. [16] Considering the limitations, there is a critical need in improving the processability of silica loading with homogenous distribution in polymer nanofibers. The challenge is to obtain ultrafine composite scaffolds by preventing particle agglomeration and bead formation during electrospinning process.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Silication of Polymer Nanofibers to Engineer Multi‐Biofunctional Composites

et al. 2018

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The critical role of silica in bone homeostasis has motivated the development of silica‐based biomaterials for orthopedic applications. Whereas polymer nanofibers have emerged as promising substrates for orthopedic applications, nanoparticle agglomeration precludes the preparation of silica containing composite nanofibers by electrospinning. This work presents a facile sol‐gel process to fabricate electrospun nanocomposite fibers by in situ silica gelation in poly (ϵ‐caprolactone) (PCL) solution. Citric acid is shown to be more effective than acetic acid as the pH catalyst for gelation by rapidly yielding near uniform nanoparticles (150+50 nm). The composite nanofibers exhibited increased water wettability than neat PCL with sustained release of silicon ions. The composite fibers induced early apatite formation in simulated body fluid. Quantitative characterization of the tubular networks formed by human umbilical cord vascular endothelial cells revealed that the eluted silicon ions and citric acid in fibers synergistically promoted angiogenic activity, which was corroborated by increased gene and protein expressions of several known angiogenic markers. Furthermore, silicate fibers augmented osteogenesis of human mesenchymal stem cells as measured by the increased mineral deposition and increased gene and protein expression of osteogenic markers. Thus, the in situ silicated fibers are promising multi‐biofunctional materials for orthopedic applications.

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Section: Discussionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

In Situ Silication of Polymer Nanofibers to Engineer Multi‐Biofunctional Composites

et al. 2018

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“…(11 of which are found in China) or Onaepia, a sect. confined to western North America and Mexico (Ji et al, 2012;Kamenetsky and Dole, 2012;Zaiyou et al, 2013). Herbaceous species are perennial, growing to around 3 ft in height and often have fragrant flowers, which grow to around 6 in.…”

Section: Introductionmentioning

confidence: 99%

A Pharmacological Review of Bioactive Constituents ofPaeonia lactifloraPallas andPaeonia veitchiiLynch

et al. 2016

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The roots of two peony species, Paeonia lactiflora Pallas and Paeonia veitchii Lynch are routinely referred to as either chishao () or baishao (). This paper reviews the botanical origins and traditional medicinal usage of each species, as well as pharmacological like activity of their constituents. A search of herbal pharmacological encyclopaedia, PubChem and PubMed databases identified their known constituents. The biological data for these constituents were evaluated and classified according to pharmacological-like activity, with emphasis on compounds of greatest concentration and bioavailability. It was found that P. lactiflora and P. veitchii have some common compounds; however, their phytochemical bioavailability varies. Furthermore, a larger number of compounds have been identified in P. lactiflora. These have greater potential for antiinflammatory, antiviral, antibacterial and antioxidant therapeutic activity compared with P. veitchii. However, evidence indicates both species are similarly indicated for antiviral and glycaemic activity. Major compounds of each are classified as flavonoids, hydrolysable tannins (polyphenols) and monoterpene glycosides. The evidence suggests both species, when administered in entire botanical form, have an excellent safety profile; however, constituent toxicity risk evidence is limited, requiring further investigation. Although experiments show many compounds have biological activity, further investigation of their therapeutic potential is needed. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Understandably, a single method such as SEM or a single technique such as pollen observation is not sufficient to correctly classify these cultivars. A comprehensive analysis would ideally need to combine various other methods and techniques, such as plant phenotype, molecular markers, cytology, and genetics (e.g., Ji et al, 2012). Xu et al (2008) argued that the degree of similarity in pollen grains serves as a preliminary indication of the genetic relationships among cultivars.…”

Section: Size and Structure And Ploidymentioning

confidence: 99%

Pollen Morphology of Herbaceous Peonies with Different Ploidy Levels

Hao¹,

Ma²,

Silva³

et al. 2016

J. Amer. Soc. Hort. Sci.

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The pollen morphology of 26 cultivars of herbaceous peony (Paeonia L.) was examined by scanning electron microscopy (SEM). Pollen grains of the cultivars were mostly subprolate to perprolate, tricolporate, or ellipsoidal in equatorial view, but rounded-trifid in polar view. The poles of pollen grains were mainly flat when viewed in cross-section and only a few appeared to have a circular or arc shape. In addition, the surface of the pollen grains was psilate, and the muri were partly or fully protuberant with a reticulate surface sculpture. However, the shapes and sizes of pollen grains as well as surface ornamentation varied significantly among cultivars with different chromosome numbers. The pollen grains from diploid cultivars were regular and full, and the reticulation holes were evenly distributed, while most of the pollen grains from triploid cultivars were empty flat shells with some heteromorphic pollen whose surface ornamentation was mostly rugulate-reticulate exine. The pollen grains from tetraploid cultivars were the largest although pollen morphology and surface ornamentation differed between Athena and Cream Delight. Six indices [polar axis length (P), equator axis length (E), P/E, pollen perforation diameter (D), ridge width (W), and D/W] were used in Q cluster analysis, which divided the 26 cultivars into three groups. Group I included eight diploid, four triploid, and one tetraploid cultivar. Group II included 12 triploid cultivars with complex genetic backgrounds. Group III included only one tetraploid cultivar Cream Delight. This work may provide an important palynological basis for studying taxonomy and hybrid breeding of herbaceous peony cultivars.

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The genetic diversity of Paeonia L.

Cited by 40 publications

References 39 publications

In Situ Silication of Polymer Nanofibers to Engineer Multi‐Biofunctional Composites

In Situ Silication of Polymer Nanofibers to Engineer Multi‐Biofunctional Composites

A Pharmacological Review of Bioactive Constituents ofPaeonia lactifloraPallas andPaeonia veitchiiLynch

Pollen Morphology of Herbaceous Peonies with Different Ploidy Levels

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