Characterization of terpenoids and norisoprenoids from base and retail Qingke Baijiu by GC×GC-TOFMS and multivariate statistical analysis

Qingke(highland barley)Baijiu is a special Chinese Baijiu which is mainly produced from Qinghai-Tibet Plateau.Since the pine board is used as the bottom of the fermentation pit,we deduced that the terpenoids and norisoprenoids in pine board might be introduced into Qingke Baijiu.Thus,the terpenoids and norisoprenoids in Qingke Baijiu were investigated by headspace solid phase microextraction(HS-SPME)combined with comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry(GC×GC-TOFMS).The results showed thatγ-terpinene(0.70-530.72μg/L),α-phellandrene(0.34-256.66μg/L),longicyclene(0-38.55μg/L),α-pinene(1.21-35.54μg/L)and limonene(0.93-23.69μg/L)were the top 5 terpenoids/norisoprenoids in Qingke Baijiu.Pulegone was detected and reported for the first time in Baijiu,and the concentrations in Qingke Baijiu were 0.78μg/L(fresh)and 3.90μg/L(7 years old).According to the principal component analysis(PCA)plot,young,aged,and retail Qingke Baijiu could be differentiated clearly.Fold change(FC)and t-tests analysis indicated thatβ-pinene,γ-terpinene,andα-selinene were the most different terpenoids/norisoprenoids between young and aged Qingke Baijiu,and longifolene was the most different terpenoids/norisoprenoids between base and retail Qingke Baijiu.The terpenoids and norisoprenoids,such as(E)-β-ionone,isoborneol andβ-cyclocitral,could be potential markers indicating the ageing process of Qingke Baijiu.

Remodeling Isoprene Pyrophosphate Metabolism for Promoting Terpenoids Bioproduction

Terpenoids are the largest family of natural products.They are made from the building block isoprene pyrophosphate(IPP),and their bioproduction using engineered cell factories has received a great deal of attention.To date,the insufficient metabolic supply of IPP remains a great challenge for the efficient synthesis of terpenoids.In this work,we discover that the imbalanced metabolic flux distribution between the central metabolism and the IPP supply hinders IPP accumulation in Bacillus subtilis(B.subtilis).Therefore,we remodel the IPP metabolism using a series of genetically encoded two-input-multioutput(TIMO)circuits that are responsive to pyruvate or/and malonyl-CoA,resulting in an IPP pool that is significantly increased by up to four-fold.As a proof-of-concept validation,we design an IPP metabolism remodeling strategy to improve the production of three valuable terpenoids,including menaquinone-7(MK-7,4.1-fold),lycopene(9-fold),andβ-carotene(0.9-fold).In particular,the titer of MK-7 in a 50-L bioreactor reached 1549.6 mg·L^(-1),representing the highest titer reported so far.Thus,we propose a TIMO genetic circuits-assisted IPP metabolism remodeling framework that can be generally used for the synergistic fine-tuning of complicated metabolic modules to achieve the efficient bioproduction of terpenoids.

The antifungal properties of terpenoids from the endophytic fungus Bipolaris eleusines

A series of terpenoids(1-17),comprising six new compounds designated bipolariterpenes A-F(1-6)and eleven rec-ognized compounds(7-17),were isolated from the wheat culture of the potato endophytic fungus Bipolaris eleusines.Their structures and stereochemistry were clarified by HRESIMS,NMR,DP4+probability analyses,and computations for electronic circular dichroism(ECD).All compounds are made up of six meroterpenoids,four sesterterpenes and seven sesquiterpenes.Among them,four sesterterpenes(4,5,10,11)were investigated for their antifungal,antibacterial and cytotoxic properties,and six meroterpenoids(1-3,7-9)were evaluated for their antifungal properties.The compounds 7,9,and 10 had substantial antifungal activity against Epidermophyton floccosum at a concentration of 100μM.No antibacterial and cytotoxic activities were observed.

补骨脂化学成分研究进展

补骨脂是豆科植物Psoralea corylifolia L.的干燥成熟果实,作为一种传统的中药,其在我国已有几千年的临床应用历史,广泛地用于心血管疾病、肾炎、骨质疏松和癌症等的治疗。植物化学研究显示,香豆素类、杂萜类和黄酮类是其主要化学成分。对补骨脂化学成分研究进行系统梳理,以期为临床更安全、有效地使用补骨脂和研究补骨脂现代中药提供理论依据。

芍药PlHDR基因的克隆及生物信息学分析

为了预测芍药4-羟基-3-甲丁-2-烯基二磷酸还原酶(PlHDR)基因的功能,以芍药叶为材料,基于RT-PCR技术克隆了芍药PlHDR基因并对其进行了序列分析,用生物信息学软件预测了PlHDR的物理化学性质及结构特征。结果表明,芍药PlHDR基因cDNA全长1559 bp,共编码462个氨基酸,分子量52.11 kDa,等电点为5.46;芍药PlHDR与喜树HDR亲缘关系最近,氨基酸相似性高达87.45%;芍药PlHDR是定位于叶绿体内的亲水性蛋白,不存在跨膜结构域及信号肽,含有5个糖基化位点和50个磷酸化位点;二级结构中α-螺旋和无规则卷曲分别占比48.48%和29.22%;3D结构预测为单体;芍药PlHDR与HDS、DXR、CDPMEK、MK和MVD1等蛋白存在相互作用。本研究报道了芍药PlHDR基因序列并对其进行了生物信息学分析,为进一步开展该基因在芍药萜类物质合成中的功能研究奠定了基础。

微生物发酵法合成虾青素的研究进展

虾青素是一种高附加值的抗氧化萜类物质,具有很强的抗氧化活性,同时还具有抗癌、预防炎症、护眼等诸多功效。随着合成生物学技术的不断发展,利用微生物发酵法合成虾青素是实现虾青素工业化生产最有效的途径之一,也更能满足消费者对天然化合物的需求。目前,生产虾青素的微生物包括细菌、真菌、藻类等。本文系统介绍了虾青素的结构性质和生产方法,重点讲述了虾青素天然合成以及外源构建的合成路径,总结了不同微生物如雨生红球藻、酵母和大肠杆菌生产虾青素的最新进展,分析了利用基因工程和发酵过程调控手段提高虾青素产量的方法。未来,通过代谢工程等手段(如虾青素合成基因过表达、使用高强度启动子、代谢途径优化等)可提高虾青素产量,以进一步增加虾青素在食品、医疗、化妆品和饲料等产业的应用。

稀花八角枫木脂素及萜类成分研究

目的研究稀花八角枫的木脂素及萜类成分。方法70%乙醇提取物采用多种柱色谱进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。结果从中分离得到24个化合物,分别鉴定为松脂素(1)、杜仲树脂酚(2)、丁香脂素(3)、dehydrodiconifery alcohol-9′-β-D-glucopyranoside(4)、7,9,9′-trihydroxy-3,3′-dimethoxy-8-O-4′-neolignan-4-O-β-D-glucopyranoside(5)、citrusin B(6)、dihydrodehydrodiconiferyl alcohol-4-O-β-D-glucopyranosides(7)、5-甲氧基-(+)-异落叶松脂素(8)rel-(7R,8S)-3,3′,5-trimethoxy-4′,7-epoxy-8,5′-neolignan-4,9,9′-triol-9-β-D-glucopyranoside(9)、(+)-南烛木树脂酚-3α-O-β-D-葡萄糖苷(10)、龙花苷B(11)、(7 S,8R)-1-[4-O-(β-D-glucopyranosyl)-3-methoxyphenyl]-2-[4-(3-hydroxypropyl)-2,6-dimethoxyphenoxy]-1,3-propanediol(12)、(7 R,8S)-4,9,9′-trihydroxyl-3-methoxyl-7,8-dihydrobenzofuran-1′-propylneolignan-3′-O-β-D-glucopyranoside(13)、(7 S,8R)-4,9,9′-trihydroxy-3,3′,5-trimethoxy-8,4′-oxy-neolignan-4-O-β-D-glucopyranoside(14)、cedrusin-4-O-β-D-glucopyranoside(15)、2,6,2′,6′-tetramethoxy-4,4′-bis(2,3-epoxy-1-hydroxypropyl)biphenyl(16)、路路通内酯(17)、mansonone E(18)、mansonone G(19)、mansonone H(20)、长寿花糖苷(21)、bullatantriol(22)、3-O-α-L-arabinopyranosyl-28-O-β-D-glucopyranosyl pomolic acid(23)、水芹素(24)。结论化合物1~16为木脂素类化合物,17~24为萜类化合物。化合物3~9、11~17、22~24为首次从八角枫属中分离得到,1、2、10、18~21为首次从该植物中分离得到。

蒙药京大戟奶制前后肠道毒性变化及成分分析

目的探究蒙药京大戟奶制前后肠道毒性变化与成分组成变化的相关性。方法小鼠灌胃给予生品京大戟、牛奶浸泡京大戟(奶制)及水浸泡京大戟(水制)的95%乙醇提取物,以粪便含水量、小鼠各肠段炎症因子TNF-α和IL-1β水平为指标,考察京大戟奶制前后的泻下作用及肠道致炎毒性变化;采用LC-MS/MS分析京大戟奶制前后95%醇提取物的成分组成变化。结果与空白组相比,京大戟生品、水制品可导致小鼠粪便含水量及各肠段TNF-α和IL-1β水平显著升高(P<0.05);与生品组相比,奶制品组各指标均显著下降(P<0.05),水制品组则无显著差异,表明水制不能起到减毒作用,辅料牛奶是降低京大戟毒性的关键辅料。质谱分析结果显示,京大戟中共鉴定出50个成分,其中萜类成分38个,酚酸类成分6个,其它成分6个,奶制后各成分含量均有不同程度的下降。对生、制品京大戟质谱数据进行主成分分析(Principal component analysis,PCA)及正交偏最小二乘法-判别分析(Partial least squares discriminant analysis,OPLS-DA)发现,生、制品成分可明显聚为2类,通过t检验筛选出生、制品的13个差异性成分,其中11个是萜类成分,表明京大戟奶制后萜类成分组成发生显著变化。炮制后牛奶辅料残液中检测出来源于京大戟的17个成分,其中16个为萜类成分,表明京大戟萜类成分在炮制浸泡过程中转移至辅料牛奶中。结论京大戟奶制后毒性降低、泻下作用缓和,其减毒机制可能与牛奶浸泡炮制过程中,萜类成分转移至牛奶中,饮片中毒性成分含量降低有关。

萜类物质抑藻效应及富萜植物共培养抑藻研究

为解决夏季淡水水体中蓝藻水华问题,以铜绿微囊藻为研究对象,从薄荷醇、龙脑、香叶醇、穿心莲内酯、芳樟醇以及柠檬醛6种萜类化合物中筛选高效抑藻剂,探讨其抑藻效应、机理、应用方式及生态安全性.研究结果表明,香叶醇与柠檬醛对铜绿微囊藻的抑制效果最佳,且抑制率随浓度增大而增加.在浓度为60mg/L时,香叶醇与柠檬醛最大抑制率分别为86.9%、76.0%.在香叶醇与柠檬醛的作用下,铜绿微囊藻的叶绿素a、类胡萝卜素含量下降,光合作用受到抑制;抗氧化酶活性降低,细胞内活性氧积累;自由基攻击细胞膜,细胞结构受到破坏,从而导致藻细胞死亡.香叶醇与柠檬醛未展示出“低促高抑”的性质,对衣藻与萼花臂尾轮虫毒性较小,对伊乐藻与斑马鱼无显著影响,具有一定的生态安全性.富含香叶醇的柠檬香蜂草与富含柠檬醛的香茅草,在与铜绿微囊藻共培养时表现出显著的抑藻能力,抑藻率高达95%,适合作为浮床植物应用于蓝藻水华的防控.

莪术挥发油化学成分及其药理作用研究

莪术挥发油为中药莪术发挥药用价值的主要活性部位,总结有关莪术挥发油化学成分的文献报道,发现目前从莪术挥发油中共鉴定出成分130余种,包括萜类(单萜、倍半萜)、酮(醛)类、醇(酚)类、烷(烯)烃类、酸(酯)类、醚类、芳香族等化合物,其中萜类为其主要化合物成分。莪术挥发油具有抗肿瘤、抗炎抑菌、抗病毒、抗血栓、保肝、保护神经、抗氧化等药理作用。目前,莪术挥发油所开发出的莪术油注射液、复方莪术油栓等广泛应用于临床。文章对莪术挥发油的提取工艺、化学成分及药理作用进行文献综述,以期为莪术挥发油在临床用药、制剂等方面提供参考。

山茶花花香成分鉴定及相关基因的转录组分析

为了探究山茶花品种香太阳、香妃和赤丹不同花期花瓣中的挥发性成分,采用顶空-固相微萃取(HS-SPME)和气相色谱-质谱联用(GC-MS)技术,并结合相对气味活度值(ROAV)鉴定关键香气成分。通过转录组测序技术,探究山茶花花香生物合成途径及花香差异形成相关基因。结果表明,3个山茶花品种的主要花香成分由单萜和苯环型/苯丙素类化合物构成,单萜种类最多,品种间成分和含量有明显差异。共鉴定出16种特征香气成分,其中,芳樟醇为关键香气成分,对山茶花整体香气的表达起主控作用。从转录组数据中筛选出7个甲羟戊酸(MVA)途径结构基因和8个甲基赤藓醇磷酸(MEP)途径结构基因,其中CaDXS2、CaDXS3为单萜合成关键结构基因。筛选出萜类合成途径关键酶基因CaLIS/NES1和CaLIS/NES2及苯环型/苯丙素类化合物合成途径关键酶基因CaPAR和CaSAMT,推测上述基因在花香关键成分芳樟醇、2-苯乙醇和水杨酸甲酯的合成中发挥关键作用。对差异表达基因进行实时荧光定量PCR(qRT-PCR)和RNA-seq验证,结果显示二者拟合度较高,因此认为RNA-seq测序结果具有较高的准确性。研究结果为山茶花花香形成机理研究提供了依据。

Chromosome-level assembly of triploid genome of Sichuan pepper(Zanthoxylum armatum)

As an important spice species in Rutaceae, the Sichuan pepper (Zanthoxylum armatum) can provide pungent and numbing taste, as well as aroma in its mature fruit. Here we assembled a chromosome-level genome of green prickly ash which was widely cultivated in a major production area including Chongqing and Sichuan province, China. We generated 712 Gb (~112×) PacBio long reads and 511 Gb (~82×) Hi-C data, and yielded an assembly of 99 pseudochromosomes with total size of 5.32 Gb and contig N50 of 796 kb. The genomic analyses and cytogenetic experiments both indicated that the cultivarZhuye Huajiao’ was a triploid. We identified a Zanthoxylum-specific whole genome duplication event emerging about 24.8 million years ago (Mya). We also detected a transposition burst event (0.3-0.4 Mya) responsible for the large genome size of Z. armatum. Metabolomic analysis of the Zanthoxylum fruits during development stages revealed profiles of39 volatile aroma compounds and 528 secondary metabolites, from which six types of sanshools were identified. Based on metabolomic and transcriptomic network analysis, we screened candidate genes encoding long chain acyl-CoA synthetase, fatty acid desaturase,branched-chain amino acid aminotransferase involved in sanshool biosynthesis and three genes encoding terpene synthase during fruit development. The multi-omics data provide insights into the evolution of Zanthoxylum and molecular basis of numbing and aroma flavor of Sichuan pepper.

The effect of celastrol in combination with 5-fluorouracil on proliferation and apoptosis of gastric cancer cell lines

Background:Despite the availability of chemotherapy drugs such as 5-fluorouracil(5-FU),the treatment of some cancers such as gastric cancer remains challenging due to drug resistance and side effects.This study aimed to investigate the effect of celastrol in combination with the chemotherapy drug 5-FU on proliferation and induction of apoptosis in human gastric cancer cell lines(AGS and EPG85-257).Materials and Methods:In this in vitro study,AGS and EPG85-257 cells were treated with different concentrations of celastrol,5-FU,and their combination.Cell proliferation was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide(MTT)assay.The synergistic effect of 5-FU and celastrol was studied using Compusyn software.The DNA content at different phases of the cell cycle and apoptosis rate was measured usingflow cytometry.Results:Co-treatment with low concentrations(10%inhibitory concentration(IC10))of celastrol and 5-FU significantly reduced IC50(p<0.05)so that 48 h after treatment,IC50 was calculated at 3.77 and 6.9μM for celastrol,20.7 and 11.6μM for 5-FU,and 5.03 and 4.57μM for their combination for AGS and EPG85-257 cells,respectively.The mean percentage of apoptosis for AGS cells treated with celastrol,5-FU,and their combination was obtained 23.9,41.2,and 61.9,and for EPG85-257 cells 5.65,46.9,and 55.7,respectively.In addition,the 5-FU and celastrol-5-FU combination induced cell cycle arrest in the synthesis phase.Conclusions:Although celastrol could decrease the concentration of 5-fluorouracil that sufficed to suppress gastric cancer cells,additional studies are required to arrive at conclusive evidence on the anticancer effects of celastrol.

佩兰化学成分及生物活性研究进展

佩兰为菊科植物佩兰Eupatorium fortune Turcz.的干燥地上部分,具有芳香化湿、醒脾开胃、发表解暑等多种功效,主治湿浊中阻、脘痞呕恶、口中甜腻、口臭、多涎、暑湿表证、湿温初起、发热倦怠、胸闷不舒等病症。通过搜索中国知网、PubMed、SciFinder、Web of Science等数据库,查找国内外已经发表的佩兰相关文献,对近30年佩兰的化学成分和生物活性研究进行系统地梳理、归纳,发现目前已从佩兰中共分离出超过90种化合物,包括挥发油类、百里酚类、生物碱类、萜类、酚类等,其中百里酚类、生物碱类和萜类为主要成分。生物活性研究显示佩兰提取物及其活性成分具有抗病毒、抗糖尿病、抑菌、抗炎等多种生物活性,其作用机制可能与抑制或激活相关信号通路或相关蛋白表达等有关。为佩兰资源后续深入系统地研究和临床开发提供理论参考和科学依据。

不同化学型樟树中萜类成分及药理活性的研究进展

5种化学型樟树在医药、化工、香精香料等领域具有重要的价值,这与其含有丰富的萜类成分密切相关。经统计,在5种化学型樟树中已报道的萜类成分共有184种,包括单萜94种、倍半萜88种和二萜2种,这些萜类化合物中除了共有成分7种以外,特有成分油樟型樟树有18种、脑樟型樟树有7种、芳樟型樟树有27种、龙脑樟型樟树有41种以及异樟型樟树有25种。5种化学型樟树具有抗菌、抗炎、抗肿瘤和抗病毒等作用,因此备受人们的关注。本文对近30年5种化学型樟树中萜类成分及药理活性研究进行总结分析,并对其萜类化合物的药物开发进行讨论与展望,以期为不同化学型樟树的深入研究与开发提供参考。

Variation in the Composition of the Essential Oil of Commercial Salvia officinalis L.Leaves Samples from Different Countries

Salvia officinalis L.(Lamiaceae)leaves and its essential oil is used for mouth and throat disorders,skin disorders,minor wounds,and gastrointestinal disorders,and is widely used worldwide.The research aimed to conduct a comparative study of the composition of S.officinalis essential oils from commercial samples,and their main chemotypes.The volatile constituents from S.officinalis leaves were investigated using gas chromatography(GC).The commercial samples of sage leaves were obtained from retail pharmacies in nine mainly European countries.The yield of essential oil in S.officinalis commercial leaves was between 10.0 and 24.8 mL/kg.The principal components(>5%)among the main identified 25 compounds were 1,8-cineole(8.3%–45.3%),α-thujone(3.0%–34.0%),сamphor(11.3%–29.3%),β-thujone(1.5%–12.9%),viridiflorol(1.1%–10.4%),camphene(2.6%–7.1%),andα-pinene(1.3%–5.8%).In seven(Estonia,England,France,Hungary,Belgium,Ukraine,Georgia)samplesα-thujone dominated.Four samples(Estonia,Georgia,England,Hungary)belong to the most common chemotypeα-thujone>camphor>1,8-cineole.Eight chemotypes of S.officinalis essential oils have been found.Toxic thujones are widespread compounds among them.

Comparative Analysis of the Essential Oil of the Underground Organs of Valeriana spp. from Different Countries

Valeriana officinalis L.is a plant from the Caprifoliaceae family,which is widely distributed in various parts of the world,especially in Europe and Asia.All species of Valeriana are distinguished by their ability to synthesize essen-tial oil,which has a powerful effect on the physiological and mental aspects of the human body.The aim was to study the qualitative and quantitative composition of essential oil from valerian roots,collected in different coun-tries,using the gas chromatography method,and to establish marker compounds for valerian species.13 samples of commercial roots with rhizomes of V.officinalis from nine countries of the world and a sample of Valeriana pratensis and Valeriana stolonifera growing in Ukraine were selected for the study.The essential oil was obtained from dried valerian roots by the distillation method described in the European Pharmacopoeia.To determine the component composition of the essential oils of the selected samples,the methods of gas chromatography with a mass spectrometric detector and capillary gas chromatography were used.The commercial samples of V.offici-nalis from different countries yielded 0.21%–1.03%of essential oil.Only six of 13 samples contained essential oil in an amount that satisfies the requirement of the European Pharmacopoeia standard(not less than 4 mL/kg).150 compounds were identified in the essential oils of 13 samples of V.officinalis essential oils.The range and average content and coefficients of variation of the identified compounds were determined.The principal com-pounds of V.officinalis essential oils were bornyl acetate(1.6%–27.1%),valeranone(0.5%–17.9%),valerenal(0%–14.7%),camphene(0%–14.6%),α-fenchene(0%–10.6%),and valerenic acid(0%–8.5%).The samples of V.pratensis and V.stolonifera yielded rather high levels of essential oil(1.18%and 0.93%,respectively).Three chemotypes of V.officinalis samples were determined-bornyl acetate/valerenal,valeranone,and isovaleric acid.The composition of the three essential oils compared was rather similar.Based on the study results,we propose the following marker compounds for V.officinalis consistently present in all 16 examined samples:bornyl acetate(1.6%–27.1%),limonene(0.2–2.3),and valeranone(0.5%–17.9%).The study of samples from Ukraine indicates the prospects of using these species of the genus Valeriana with the aim of expanding the raw material base and creating potential herbal preparations with a sedative effect,which are extremely necessary for the population of the country in the war and post-war periods.

An overview of pigment gland morphogenesis and its regulatory mechanism

Cotton has enormous economic potential,providing high-quality protein,oil,and fibre.But the comprehensive utilization of cottonseed is limited by the presence of pigment gland and its inclusion.Pigment gland is a common characteristic of Gossypium genus and its relatives,appearing as visible dark opaque dots in most tissues and organs of cotton plants.Secondary metabolites,such as gossypol,synthesized and stored in the cavities of pigment glands act as natural phytoalexins,but are toxic to humans and other monogastric animals.However,only a few cotton genes have been identified as being associated with pigment gland morphogenesis to date,and the developmental processes and regulatory mechanism involved in pigment gland formation remain largely unclear.Here,the research progress on the process of pigment gland morphogenesis and the genetic basis of cotton pigment glands is reviewed,for providing a theoretical basis for cultivating cotton with the ideal pigment gland trait.

恶臭假单胞菌F1表达P450酶催化柠檬烯生物合成紫苏醇

紫苏醇是一种天然存在的单萜类化合物,在医药、日化、食品等行业具有广阔应用前景,但利用柠檬烯生物合成中的过程中存在选择性不强、底物对宿主菌株有毒性等问题。为此该文选择恶臭假单胞菌F1这种对环境具有高耐受度的菌株,构建在大肠杆菌和恶臭假单胞菌中皆可扩增并表达目的基因的广宿主载体,过表达选择性羟化酶CymAa、CymAb,异源表达特异性氧化柠檬烯生成紫苏醇的P450酶CYP153A6,并在表达P450酶的基础上对柠檬烯底物添加浓度进行了调整,与大肠杆菌BL21(DE3)一同进行柠檬烯生物合成紫苏醇实验,并使用紫外可见分光光度计和GC-MS分别测量菌株生长状况和紫苏醇产量。最终证明了恶臭假单胞菌F1在柠檬烯浓度为10 mmol/L内的环境中具有高耐受度,且添加1 mmol/L柠檬烯底物发酵48 h后获得最高产量75.6 mg/L,最高转化率达到49.66%,缩小了生物合成紫苏醇的底物添加范围,并获得对柠檬烯具有高耐受度的发酵宿主。

紫丁香SoDXR基因克隆及其在单萜类物质合成中的功能分析

[目的]探究1-脱氧-D-木酮糖-5-磷酸还原异构酶(DXR)基因在紫丁香单萜类物质合成中的作用,为紫丁香花香分子育种提供有效的基因资源和理论基础。[方法]以紫丁香花瓣为材料,克隆了SoDXR基因,并对其进行生物信息学和亚细胞定位分析、不同花发育时期和器官组织中的qRT-PCR表达分析以及探究其在金鱼草花瓣中异源瞬时过表达后的功能。[结果]SoDXR基因全长为1425 bp,编码474个氨基酸,编码的蛋白具有保守的DXP_reductoisom结构域,与桂花和油橄榄的相似性高达95%。亚细胞定位显示该蛋白主要定位于质体,与软件预测结果一致。伴随着开花,SoDXR表达水平呈先升高后降低的趋势,在初开期最高,其在各个器官组织中均有表达,花瓣中表达量最高,茎中表达量最低。瞬时过表达表明,SoDXR基因的表达水平显著高于对照,促进了主要单萜成分罗勒烯和月桂烯的释放,释放量分别增加了15.03倍和4.83倍。[结论]SoDXR基因正调控紫丁香单萜类物质的合成,表明DXR基因在花香次级代谢物合成中起到重要作用。