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Ginsenosides in Panax genus and their biosynthesis. Acta Pharm Sin B 2021; 11:1813-1834. [PMID: 34386322 PMCID: PMC8343117 DOI: 10.1016/j.apsb.2020.12.017] [Citation(s) in RCA: 93] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 12/03/2020] [Accepted: 12/11/2020] [Indexed: 12/12/2022] Open
Abstract
Ginsenosides are a series of glycosylated triterpenoids which belong to protopanaxadiol (PPD)-, protopanaxatriol (PPT)-, ocotillol (OCT)- and oleanane (OA)-type saponins known as active compounds of Panax genus. They are accumulated in plant roots, stems, leaves, and flowers. The content and composition of ginsenosides are varied in different ginseng species, and in different parts of a certain plant. In this review, we summarized the representative saponins structures, their distributions and the contents in nearly 20 Panax species, and updated the biosynthetic pathways of ginsenosides focusing on enzymes responsible for structural diversified ginsenoside biosynthesis. We also emphasized the transcription factors in ginsenoside biosynthesis and non-coding RNAs in the growth of Panax genus plants, and highlighted the current three major biotechnological applications for ginsenosides production. This review covered advances in the past four decades, providing more clues for chemical discrimination and assessment on certain ginseng plants, new perspectives for rational evaluation and utilization of ginseng resource, and potential strategies for production of specific ginsenosides.
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Key Words
- ABA, abscisic acid
- ADP, adenosine diphosphate
- AtCPR (ATR), Arabidopsis thaliana cytochrome P450 reductase
- BARS, baruol synthase
- Biosynthetic pathway
- Biotechnological approach
- CAS, cycloartenol synthase
- CDP, cytidine diphosphate
- CPQ, cucurbitadienol synthase
- CYP, cytochrome P450
- DDS, dammarenediol synthase
- DM, dammarenediol-II
- DMAPP, dimethylallyl diphosphate
- FPP, farnesyl pyrophosphate
- FPPS (FPS), farnesyl diphosphate synthase
- GDP, guanosine diphosphate
- Ginsenoside
- HEJA, 2-hydroxyethyl jasmonate
- HMGR, HMG-CoA reductase
- IPP, isopentenyl diphosphate
- ITS, internal transcribed spacer
- JA, jasmonic acid
- JA-Ile, (+)-7-iso-jasmonoyl-l-isoleucine
- JAR, JA-amino acid synthetase
- JAZ, jasmonate ZIM-domain
- KcMS, Kandelia candel multifunctional triterpene synthases
- LAS, lanosterol synthase
- LUP, lupeol synthase
- MEP, methylerythritol phosphate
- MVA, mevalonate
- MVD, mevalonate diphosphate decarboxylase
- MeJA, methyl jasmonate
- NDP, nucleotide diphosphate
- Non-coding RNAs
- OA, oleanane or oleanic acid
- OAS, oleanolic acid synthase
- OCT, ocotillol
- OSC, oxidosqualene cyclase
- PPD, protopanaxadiol
- PPDS, PPD synthase
- PPT, protopanaxatriol
- PPTS, PPT synthase
- Panax species
- RNAi, RNA interference
- SA, salicylic acid
- SE (SQE), squalene epoxidase
- SPL, squamosa promoter-binding protein-like
- SS (SQS), squalene synthase
- SUS, sucrose synthase
- TDP, thymine diphosphate
- Transcription factors
- UDP, uridine diphosphate
- UGPase, UDP-glucose pyrophosphosphprylase
- UGT, UDP-dependent glycosyltransferase
- WGD, whole genome duplication
- α-AS, α-amyrin synthase
- β-AS, β-amyrin synthase
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Induced biosynthesis of chlorogenic acid in sweetpotato leaves confers the resistance against sweetpotato weevil attack. J Adv Res 2020; 24:513-522. [PMID: 32612857 PMCID: PMC7320233 DOI: 10.1016/j.jare.2020.06.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 05/26/2020] [Accepted: 06/12/2020] [Indexed: 10/24/2022] Open
Abstract
Sweetpotato weevil is among the most harmful pests in some major sweetpotato growing areas with warm climates. To enable the future establishment of safe weevil-resistance strategies, anti-weevil metabolites from sweetpotato should be investigated. In the present study, we pretreated sweetpotato leaves with exogenous chlorogenic acid and then exposed them to sweetpotato weevils to evaluate this compound's anti-insect activity. We found that chlorogenic acid applied to sweetpotato conferred significant resistance against sweetpotato-weevil feeding. We also observed enhanced levels of chlorogenic acid in response to weevil attack in sweetpotato leaves. To clarify how sweetpotato weevils regulate the generation of chlorogenic acid, we examined key elements of plant-herbivore interaction: continuous wounding and phytohormones participating in chlorogenic acid formation. According to our results, sweetpotato weevil-derived continuous wounding induces increases in phytohormones, including jasmonic acid, salicylic acid, and abscisic acid. These phytohormones can upregulate expression levels of genes involved in chlorogenic acid formation, such as IbPAL, IbC4H and IbHQT, thereby leading to enhanced chlorogenic acid generation. This information should contribute to understanding of the occurrence and formation of natural anti-weevil metabolites in sweetpotato in response to insect attack and provides critical targets for the future breeding of anti-weevil sweetpotato cultivars.
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Key Words
- 4CL, 4-coumarate: CoA ligase
- ABA, abscisic acid
- C3H, p-coumarate 3-hydroxylase
- C4H, cinnamate 4-hydroxylase
- CAF, caffeic acid
- CGA, chlorogenic acid
- Chlorogenic acid
- Continuous wounding
- HCGQT, hydroxycinnamoyl glucose: quinate hydroxycinnamoyl transferase
- HCT, hydroxycinnamoyl-CoA shikimate/quinate hydroxycinnamoyl transferase
- HQT, hydroxycinnamoyl-CoA quinate hydroxycinnamoyl transferase
- Ib, Ipomoea batatas
- JA, jasmonic acid
- PAL, phenylalanine ammonia lyase
- Phytohormone
- SA, salicylic acid
- Sweetpotato
- Sweetpotato weevil
- UGCT, UDP glucose: cinnamate glucosyl transferase
- UPLC-QTOF-MS, Ultra-performance liquid chromatography/ quadrupole time-of-flight mass spectrometry
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Bacillus subtilis: A plant-growth promoting rhizobacterium that also impacts biotic stress. Saudi J Biol Sci 2019; 26:1291-1297. [PMID: 31516360 PMCID: PMC6734152 DOI: 10.1016/j.sjbs.2019.05.004] [Citation(s) in RCA: 226] [Impact Index Per Article: 45.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/18/2019] [Accepted: 05/19/2019] [Indexed: 12/04/2022] Open
Abstract
Plants encounter many biotic agents, such as viruses, bacteria, nematodes, weeds, and arachnids. These entities induce biotic stress in their hosts by disrupting normal metabolism, and as a result, limit plant growth and/or are the cause of plant mortality. Some biotic agents, however, interact symbiotically or synergistically with their host plants. Some microbes can be beneficial to plants and perform the same role as chemical fertilizers and pesticides, acting as a biofertilizer and/or biopesticide. Plant growth promoting rhizobacteria (PGPR) can significantly enhance plant growth and represent a mutually helpful plant-microbe interaction. Bacillus species are a major type of rhizobacteria that can form spores that can survive in the soil for long period of time under harsh environmental conditions. Plant growth is enhanced by PGPR through the induction of systemic resistance, antibiosis, and competitive omission. Thus, the application of microbes can be used to induce systemic resistance in plants against biotic agents and enhance environmental stress tolerance. Bacillus subtilis exhibits both a direct and indirect biocontrol mechanism to suppress disease caused by pathogens. The direct mechanism includes the synthesis of many secondary metabolites, hormones, cell-wall-degrading enzymes, and antioxidants that assist the plant in its defense against pathogen attack. The indirect mechanism includes the stimulation of plant growth and the induction of acquired systemic resistance. Bacillus subtilis can also solubilize soil P, enhance nitrogen fixation, and produce siderophores that promote its growth and suppresses the growth of pathogens. Bacillus subtilis enhances stress tolerance in their plant hosts by inducing the expression of stress-response genes, phytohormones, and stress-related metabolites. The present review discusses the activity of B. subtilis in the rhizosphere, its role as a root colonizer, its biocontrol potential, the associated mechanisms of biocontrol and the ability of B. subtilis to increase crop productivity under conditions of biotic and abiotic stress.
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Key Words
- ABA, abscisic acid
- ACC, 1-aminocyclopropane-1-carboxylate deaminase
- Abiotic stress
- Bacillus subtilis
- Biocontrol mechanism
- Biocontrol potential
- Biotic stress
- GA3, gibberellic acid
- IAA, indole acetic acid
- ISR, induced systemic resistance
- JA, jasmonic acid
- LPs, lipopeptides
- PAL, phenylalanine ammonialyase
- PGP, plant growth promotion
- PGPR, plant growth promoting rhizobacteria
- POD, peroxidase
- PPO, polyphenol oxidase
- Rhizobacteria
- SOD, superoxide dismutase
- VOCs, volatile organic compounds
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The syntaxin 31-induced gene, LESION SIMULATING DISEASE1 (LSD1), functions in Glycine max defense to the root parasite Heterodera glycines. PLANT SIGNALING & BEHAVIOR 2015; 10:e977737. [PMID: 25530246 PMCID: PMC4622666 DOI: 10.4161/15592324.2014.977737] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 09/09/2014] [Accepted: 09/10/2014] [Indexed: 05/19/2023]
Abstract
Experiments show the membrane fusion genes α soluble NSF attachment protein (α-SNAP) and syntaxin 31 (Gm-SYP38) contribute to the ability of Glycine max to defend itself from infection by the plant parasitic nematode Heterodera glycines. Accompanying their expression is the transcriptional activation of the defense genes ENHANCED DISEASE SUSCEPTIBILITY1 (EDS1) and NONEXPRESSOR OF PR1 (NPR1) that function in salicylic acid (SA) signaling. These results implicate the added involvement of the antiapoptotic, environmental response gene LESION SIMULATING DISEASE1 (LSD1) in defense. Roots engineered to overexpress the G. max defense genes Gm-α-SNAP, SYP38, EDS1, NPR1, BOTRYTIS INDUCED KINASE1 (BIK1) and xyloglucan endotransglycosylase/hydrolase (XTH) in the susceptible genotype G. max[Williams 82/PI 518671] have induced Gm-LSD1 (Gm-LSD1-2) transcriptional activity. In reciprocal experiments, roots engineered to overexpress Gm-LSD1-2 in the susceptible genotype G. max[Williams 82/PI 518671] have induced levels of SYP38, EDS1, NPR1, BIK1 and XTH, but not α-SNAP prior to infection. In tests examining the role of Gm-LSD1-2 in defense, its overexpression results in ∼52 to 68% reduction in nematode parasitism. In contrast, RNA interference (RNAi) of Gm-LSD1-2 in the resistant genotype G. max[Peking/PI 548402] results in an 3.24-10.42 fold increased ability of H. glycines to parasitize. The results identify that Gm-LSD1-2 functions in the defense response of G. max to H. glycines parasitism. It is proposed that LSD1, as an antiapoptotic protein, may establish an environment whereby the protected, living plant cell could secrete materials in the vicinity of the parasitizing nematode to disarm it. After the targeted incapacitation of the nematode the parasitized cell succumbs to its targeted demise as the infected root region is becoming fortified.
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Key Words
- BIK1, botrytis induced kinase1
- CuSOD, copper superoxide dismutase
- EDS1, enhanced disease susceptibility1
- ER, endoplasmic reticulum
- GOI, gene of interest
- Golgi
- INA, 2,6-dichloroisonicotinic acid
- JA, jasmonic acid
- LESION SIMULATING DISEASE1 (LSD1)
- LOL1, LSD1-like
- LSD1, lesion simulating disease1
- MATE, multidrug and toxin extrusion
- NPR1, nonexpressor of PR1
- O2−, superoxide
- PAD4, phytoalexin deficient 4
- PCD, programmed cell death
- PR1, pathogenesis-related 1
- RNAi, RNA interference
- ROI, reactive oxygen intermediates
- SA, salicylic acid
- SAR, systemic acquired resistance
- SHMT, serine hydroxymethyltransferase
- SID2, salicylic-acid-induction deficient2
- Sed5p, suppressors of the erd2-deletion 5
- XTH, xyloglucan endotransglycosylase/hydrolase
- membrane fusion
- pathogen resistance
- qPCR, quantitative polymerase chain reaction
- salicylic acid
- sec, secretion
- signaling
- syntaxin 31
- vesicle
- α-SNAP, alpha soluble N-ethylmaleimide-sensitive factor attachment protein
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Molecular defense responses in roots and the rhizosphere against Fusarium oxysporum. PLANT SIGNALING & BEHAVIOR 2014; 9:e977710. [PMID: 25482759 PMCID: PMC4623376 DOI: 10.4161/15592324.2014.977710] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 04/09/2014] [Accepted: 09/04/2014] [Indexed: 05/11/2023]
Abstract
Plants face many different concurrent and consecutive abiotic and biotic stresses during their lifetime. Roots can be infected by numerous pathogens and parasitic organisms. Unlike foliar pathogens, root pathogens have not been explored enough to fully understand root-pathogen interactions and the underlying mechanism of defense and resistance. PR gene expression, structural responses, secondary metabolite and root exudate production, as well as the recruitment of plant defense-assisting "soldier" rhizosphere microbes all assist in root defense against pathogens and herbivores. With new high-throughput molecular tools becoming available and more affordable, now is the opportune time to take a deep look below the ground. In this addendum, we focus on soil-borne Fusarium oxysporum as a pathogen and the options plants have to defend themselves against these hard-to-control pathogens.
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Local and systemic transcriptional responses to crosstalk between above- and belowground herbivores in Arabidopsis thaliana. PLANT SIGNALING & BEHAVIOR 2014; 9:e976113. [PMID: 25482783 PMCID: PMC4623459 DOI: 10.4161/15592324.2014.976113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Accepted: 08/08/2014] [Indexed: 06/04/2023]
Abstract
Plants are often simultaneously infested by several herbivores at the shoots and roots. Recent results revealed that the model plant Arabidopsis thaliana shows highly challenge-specific local and systemic responses to individual and simultaneous attacks of shoot-infesting aphids and root-infesting nematodes at the metabolome level. (1) Here, we present the corresponding transcriptional changes in plants treated with Brevicoryne brassicae aphids and Heterodera schachtii nematodes individually and in combination. Overall, shoots were much less responsive than roots. Gene expression in shoots and roots was mainly altered by aphids. Nematode infestation alone had only little effect, but nematodes modified the transcript accumulation response to aphids particularly in the roots. The responding genes are involved in plant defense cascades, signaling, oxidation-reduction processes, as well as primary and secondary metabolism and degradation. These changes in transcription may become relevant for the herbivores when they are translated into changes in host plant quality.
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Four shades of detachment: regulation of floral organ abscission. PLANT SIGNALING & BEHAVIOR 2014; 9:e976154. [PMID: 25482787 PMCID: PMC4623469 DOI: 10.4161/15592324.2014.976154] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 08/15/2014] [Accepted: 08/15/2014] [Indexed: 05/19/2023]
Abstract
Abscission of floral organs from the main body of a plant is a dynamic process that is developmentally and environmentally regulated. In the past decade, genetic studies in Arabidopsis have identified key signaling components and revealed their interactions in the regulation of floral organ abscission. The phytohormones jasmonic acid (JA) and ethylene play critical roles in flower development and floral organ abscission. These hormones regulate the timing of floral organ abscission both independently and inter-dependently. Although significant progress has been made in understanding abscission signaling, there are still many unanswered questions. These include considering abscission in the context of reproductive development and interplay between hormones embedded in the developmental processes. This review summarizes recent advances in the identification of molecular components in Arabidopsis and discusses their relationship with reproductive development. The emerging roles of hormones in the regulation of floral organ abscission, particularly by JA and ethylene, are examined.
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Key Words
- AGL15, AGAMOUS-LIKE 15
- AOS/DDE2, ALLENE OXIDE SYNTHASE/DELAYED DEHISCENCE 2
- ARF-GAP, ADP-ribosylation factor-GTPase activating protein
- AZ, abscission zone
- BOP1/2, BLADE ON PETIOLE 1/2
- BTP/POZ, Broad-Complex, Tramtrack, and Bric-a-brac/Pox virus and Zinc finger
- CST, CAST AWAY RECEPTOR-LIKE KINASE
- CTR1, CONSTITUTIVE TRIPLE RESPONSE 1
- DAB4/ COI1, DELAYED ABSCISSION 4/CORONATINE INSENSITIVE 1
- DAD1, DEFECTIVE ANTHER DEHISCENCE 1
- DDE1/OPR3, DELAYED DEHISCENCE 1/OXOPHYTODIENOATE-REDUCTASE 3
- EVR, EVERSHED RECEPTOR-LIKE KINASE
- EXP, EXPANSIN
- FAD7/8/3, FATTY ACID DESATURASE 7/8/3
- FYF, FOREVER YOUNG FLOWER
- HAE/HSL2, HAESA/HAESA-LIKE 2
- IM, inflorescence meristem
- JA, jasmonic acid
- JAZ, JASMONATE-ZIM DOMAIN
- KNAT1, KNOTTED-LIKE FROM ARABIDOPSIS THALIANA 1
- LOX3/4, LIPOXYGENASE 3/4
- LRR, leucine-rich repeat
- MAPK3/6, MAP Kinase 3/6
- MKK4/5, MAP Kinase Kinase 4/5
- NEV, NEVERSHED
- NPR1, NONEXPRESSOR OF PR GENES 1
- PG , POLYGALATURONASE
- PR1, Pathogenesis-related Protein 1
- SERK1, SOMATIC EMBRYO RECEPTOR-LIKE KIASE 1
- TCP4, TEOSINTE BRANCHED/CYCLOIDEA/PCF4
- XTH , XYLOGLUCAN ENDOTRANSGLUCOSYLASE/HYDROLASE
- ein2-1, ethylene insensitive 2-1
- ethylene
- etr1-1, ethylene response1-1
- floral organ abscission
- flower senescence
- ida, inflorescence deficient in abscission
- inflorescence meristem
- jasmonic acid
- reproductive development
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