Lignin and polyphenols as allelochemicals

Popa, Valentin I.; Dumitru, M.; Volf, Irina; Anghel, Narcis

doi:10.1016/j.indcrop.2007.07.019

Cited by 121 publications

(53 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results obtained reveal a significant (p > 0.05) difference of total phenol content within different organs of A. roylei; this could be associated with the physiological and morphological importance of these metabolites in the plant. Phenolic compounds may act as phytoalexines, 33) antifeedants, attractants for pollinators, or as plant pigmentation and protection against UV light 34,35) ; the high accumulation of phenol content in the bulbs and leaves as compared with the root-basal stem strongly supports this assumption. This organdependent repartition of the total phenol content has recently been reported for A. roseum with the highest content in the flowers, bulbs, and leaves (135, 44.3, and 55.9 mg GAE/100 g fw, respectively).…”

Section: Polyphenolmentioning

confidence: 95%

Compartmentation and localization of bioactive metabolites in different organs of Allium roylei

Abdelrahman

Hirata

Ito

et al. 2014

Bioscience, Biotechnology, and Biochemistry

View full text Add to dashboard Cite

To investigate the involvement of Allium roylei metabolites in the plant's defenses, a comprehensive analysis of the content of cysteine sulfoxides, flavonols, polyphenols, ascorbic acid, and saponins was carried out in the various organs of this species. Metabolomics high performance liquid chromatography (HPLC), spectral-based analysis, and histochemcial studies have given important insight to the validity of saponins as a key component involved in plant protection. The root-basal stem, bulb, and leaf extracts exhibited 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity with inhibition concentration (IC 50 ) ranging from 0.649 to 0.757 mg/mL. The antimicrobial properties of the saponin and flavonoid crude extracts were evaluated. The saponin extracts demonstrated significant antifungal activity depending on the applied concentration, and the growth inhibition rate of the tested fungal pathogens ranged from 1.07 to 47.76%. No appreciable antibacterial activity was recorded in the same sample.Key words: cysteine sulfoxides; flavonoids; saponins; antioxidant activity; antimicrobial activityThe need for disease-and pest-resistant germplasm in onion (Allium cepa L.) breeding has promoted studies of the biosystematic relationships between edible and wild Allium species of the section Cepa.1) Domestication of wild Allium species started millennia ago, followed by extensive dissemination of the flavoring condiment all over the world.2) Many wild Allium species with the characteristic onion or garlic aroma are used as spices or vegetables by various folks.3) The wild Allium species may serve as a potential source for Allium crop improvement, and it may comprise genes for desired traits, as in Allium roylei Stearn. 4) A. roylei has proven to be a crucial bridge species, enabling introgressions of genetic resources from other related species of section Cepa into the onion, allowing disease resistance and other valuable characteristics to be introgressed into the onion.5) The prospect of exploiting A. roylei as a source of disease resistance in onion breeding is very promising, as this wild species has proven to be completely resistant to downy mildew (Perenospora destructor), and partially resistant to leaf blight disease caused by Botrytis squamosa and basal rot disease caused by Fusarium oxysporum f.sp. cepae. 6)Although edible Allium species are rich in numerous phytonutrients and bioactive metabolites (cysteine sulfoxides (ACSO), flavonoids, polyphenols, saponins, etc.) which reportedly have many functional properties such as antimicrobial, anticancer, and antioxidant, 7,8) little effort has been invested in evaluating the wild Allium species as potential sources for these bioactive metabolites with therapeutic and disease resistance properties.There is no available information concerning the distribution and localization of these bioactive metabolites in different organs of A. roylei and their role as a part of the defensive characteristics of the plant against F. oxysporum f.sp cepae. Therefore, under...

show abstract

Section: Polyphenolmentioning

confidence: 95%

Compartmentation and localization of bioactive metabolites in different organs of Allium roylei

Abdelrahman

Hirata

Ito

et al. 2014

Bioscience, Biotechnology, and Biochemistry

View full text Add to dashboard Cite

show abstract

“…PCA and other phenolics serve as allelochemicals, antioxidants, free radical scavengers and inhibitors of nitric-oxide synthase, cyclooxygenase and lipoxygenase, as well as precursors of lignin for microorganisms and plants in various biological systems (Rios et al 2009;Perron and Brumaghim 2009;Nathan and Julia 2009;Chung et al 2004;Popa et al 2008;Ogawa and Yoshimura 2010). Therefore, the characterization of PEZ2 would also greatly increase our understanding of phenolic transport in other biological systems.…”

Section: Discussionmentioning

confidence: 99%

Rice phenolics efflux transporter 2 (PEZ2) plays an important role in solubilizing apoplasmic iron

Bashir

Ishimaru

Shimo

et al. 2011

Soil Science and Plant Nutrition

View full text Add to dashboard Cite

Iron (Fe) is an essential micronutrient for plants; however, despite its abundance in soils it is not readily available in neutral to alkaline soils. Plants secrete phenolics, such as protocatechuic acid (PCA) and caffeic acid (CA), to absorb and utilize precipitated apoplasmic Fe from root surfaces. However, the synthesis and secretion of phenolics have not been well characterized in plants. We have identified and characterized a rice (Oryza sativa L.) mutant with reduced amounts of PCA and CA in xylem sap and root exudates; hence we named it phenolics efflux zero 2 (pez2). PEZ2 localized to the plasma membrane in onion (Allium cepa L.) epidermal cells and transported PCA when expressed in Xenopus laevis oocytes. PEZ2 expression was observed in whole root near root tips. Similarly, strong expression was observed in leaves. In line with reduced amounts of PCA and CA in xylem sap, the xylem Fe concentration was also low in pez2 plants. These results suggest that PEZ2 is involved in solubilization of apoplasmic Fe in rice.

show abstract

“…The mitotic index is one of the most important elements in cell survival and multiplication, providing information on the influences of some xenobiotic agents (polyphenols) on mitotic division (Popa et al 2008). It can be defined as the ratio (expressed as a percentage) of the number of cells in division to the total number of analyzed cells.…”

Section: Mitotic Index Determination and Chromosomal Aberrationsmentioning

confidence: 99%

New Aspects of Biomass Waste Valorization: Spruce Bark Crude Extracts as Plant Growth Regulators

et al. 2018

Self Cite

View full text Add to dashboard Cite

The effects of spruce bark crude extracts were evaluated relative to basil (Ocimum basilicum L.) plantlet development and metabolic processes (cellular division and histo-anatomical modification) involved in breeding. Natural phenolic compounds were separated as crude extracts by conventional and green extraction techniques, in a primary biorefining process, from Picea abies L. waste bark. First, the influence of phenolic compounds, in different concentrations, on the basil plants' main biosynthetic processes was analyzed. The mitotic indices and chromosomal aberrations of the plantlets were monitored. There was a significantly positive action of the studied bioproducts on basil root and stem growth, biomass accumulation, and photo-assimilating pigment synthesis. The natural polyphenols triggered an intensification of metabolic processes and cell division, yielding a high mitotic index and good development of vascular bundles. The results supported the possibility of exploiting spruce bark wastes by conversion into valuable bio-compounds, with uses as innovative products in green biotechnology, as simple growth bioregulators, for example, or for biotech crops.

show abstract

Lignin and polyphenols as allelochemicals

Cited by 121 publications

References 3 publications

Compartmentation and localization of bioactive metabolites in different organs of Allium roylei

Compartmentation and localization of bioactive metabolites in different organs of Allium roylei

Rice phenolics efflux transporter 2 (PEZ2) plays an important role in solubilizing apoplasmic iron

New Aspects of Biomass Waste Valorization: Spruce Bark Crude Extracts as Plant Growth Regulators

Contact Info

Product

Resources

About