Genetic diversity and inferred ancestry of Asian lotus(Nelumbo nucifera) germplasms in Thailand and Vietnam

Tropical lotus(Nelumbo) is an important and unique ecological type of lotus germplasm.Understanding the genetic relationship and diversity of the tropical lotus is necessary for its sustainable conservation and utilization.Using 42 EST-SSR(expressed sequence tag-simple sequence repeats) and 30 SRAP(sequence-related amplified polymorphism) markers,we assessed the genetic diversity and inferred the ancestry of representative tropical lotus from Thailand and Vietnam.In total,164 and 41 polymorphic bands were detected in 69 accessions by 36 EST-SSR and seven SRAP makers,respectively.Higher genetic diversity was revealed in Thai lotus than in Vietnamese lotus.A Neighbor-Joining tree of five main clusters was constructed using combined EST-SSR and SRAP markers.Cluster Ⅰ included 17 accessions of Thai lotus;cluster Ⅱ contained three Thai accessions and 11 accessions from southern Vietnam;and cluster Ⅲ was constituted by 13 accessions of seed lotus.Consistent with the results from the NeighborJoining tree,the genetic structure analysis showed that the genetic background of most Thai and Vietnamese lotus was pure,as artificial breeding has been rare in both countries.Furthermore,these analyses indicate that Thai and Vietnamese lotus germplasms belong to two different gene pools or populations.Most lotus accessions are genetically related to geographical distribution patterns in Thailand or Vietnam.Our findings showed that the origin or genetic relationships of some unidentified lotus sources can be evaluated by comparing morphological characteristics and the data of molecular markers.In addition,these findings provide reliable information for the targeted conservation of tropical lotus and parent selection in breeding novel cultivars of lotus.

Quercetin-derivatives painting the yellow petals of American lotus(Nelumbo lutea)and enzymatic basis for their accumulation

American lotus(Nelumbo lutea)is one of the two species in Nelumbo and has only yellow flower.Identification of total flavonoids showed wild American lotus contained almost only flavonols with quercetin 3-O-glucuronide to be the dominant pigment.The variation tendency of the total flavonol content was coincident with yellow color variation of petals during flower development.To understand the mechanism of accumulation and constituent of pigments in petals,three pivotal genes,NlFLS1,NlFLS2 and NlFLS3,which were predicted to encode flavonol synthases were isolated and characterized by analyses of basic bioinformatics,temporal and spatial expression patterns and enzymatic activity.Their temporal expression levels showed the same variation tendency,which was also consistent with the development-dependent variation of total flavonol content.Spatial expression patterns indicated the three genes should function in petals.All the three proteins were demonstrated to be bifunctional dioxygenase,possessing both flavonol synthase activity and flavanone 3-hydroxylase activity.Besides,other flavonol biosynthesis related genes were also investigated on their expression levels to give more clues on the mechanism.Substrate preferences of the three FLSs,substrate competitions between the FLSs and other flavonol biosynthesis related enzymes,and the greatly differential expression levels between F3’H(flavonoid 3-hydroxylase)and F3’5’H(flavonoid 3,5-hydroxylase)contributed to the flavonol constituent in the petals of America lotus,namely abundant quercetin-derivatives while very few kaempferol-derivatives and myricetin-derivatives.

Genetic Variation in Rhizome Lotus(Nelumbo nucifera Gaertn.ssp.nucifera) Germplasms from China Assessed by RAPD Markers

To estimate genetic variation in rhizome lotus （Nelumbo nucifera Gaertn. ssp. nucifera） germplasms in China, a total of 94 rhizome lotus germplasms collected from 18 provinces in China were assessed. The RAPD （randomly amplified polymorphic DNA） marker was employed. The selected 17 random primers detected 139 polymorphic alleles out of a total 207 （67.15%）. Nei＇s gene diversity statistics and region differentiation parameters indicated that all germplasms had a relatively high level of genetic diversity with ne = 1.3202, h = 0.1937, I= 0.2982 and the gene flow among all regions was Nrn = 5.5742. The UPGMA dendrogram clustered all 94 germplasms into two clusters： One contained eight commercial cultivars and major landraces, and the other included the wild and some special landraces from five regions, and the PCA analysis exhibited the similar result. Those germplasms from southwestern and eastern China had higher genetic diversity than those from the southern, northern and central China. Predominant proportion of genetic variation （95.61%） was found significant within rather than among （4.39%） regions, as revealed by AMOVA analysis. The data analysis also revealed that the genetic diversity of rhizome lotus germplasms among different regions is positively related to their geographic distances, though it is ambiguous to find the trend from the UPGMA dendrogram and the PCA analysis. A relatively high genetic diversity and gene flow resided in the root lotus germplasms; about 96% of the variation was found within region; accessions from southwest and eastern China have higher genetic diversity than those from the southern, northern and central China.

Genetic diversity of the wild Asian lotus (Nelumbo nucifera) from Northern China

Asian lotus(Nelumbo nucifera Gaertn.)is an aquatic plant with ornamental,cultural,economic,and ecological values.China has abundant germplasm resources of Asian lotus.However,in many areas,the wild Asian lotuses have been destroyed and the germplasms is now facing extinction.In addition,the knowledge of the genetic diversity of the wild Asian lotus in China is poor.To identify and protect the germplasms of Chinese wild Asian lotus,eleven genomic-SSR primers,three EST-SSR primers,and three chloroplast DNA primers were used to investigate the genetic diversity among 69 samples of wild Asian lotus from 25 locations in northern China.The genetic diversity of 27 samples of wild Asian lotus from southern China and other countries,the ancient Asian lotus,Asian lotus cultivars from China,and Asian-American hybrids was also compared.The genetic diversity of the wild Asian lotus from northern China was characterized as medium,and themean values of observed heterozygosity(Ho)and expected heterozygosity(He)were 0.087 and 0.552,respectively.Based on a UPGMA dendrogram and STRUCTURE analysis,the wild Asian lotus samples in northern China were divided into three groups.The wild Asian lotus samples from northern China contained 16 haplotypes.The Nei’s genetic distance between the wild Asian lotus samples from the Songhua River basin and the Liao River basin in northeastern China was relatively small,and these germplasms might be relatively primitive compared to those from other regions.This study provides essential information regarding the genetic diversity of the wild Asian lotus resources in northern China,and provides a basis for further analysis of population-level genetic evolution through high-throughput sequencing.

Analysis of Accumulating Ability of Heavy Metals in Lotus (Nelumbo nucifera) Improved by Ion Implantation

Heavy metals have seriously contaminated soil and water, and done harm to public health. Academician WANG Naiyan proposed that ion-implantation technique should be exploited for environmental bioremediation by mutating and breeding plants or microbes. By implanting N^＋ into Taikonglian No.l, we have selected and bred two lotus cultivars, Jingguang No.1 and Jingguang No.2. The present study aims at analyzing the feasibility that irradiation can be used for remediation of soil and water from heavy metals. Compared with parent Taikonglian No.l, the uptaking and accumulating ability of heavy metals in two mutated cultivars was obviously improved. So ion implantation technique can indeed be used in bioremediation of heavy metals in soil and water, but it is hard to select and breed a cultivar which can remedy the soil and water from all the heavy metals.

Genetic Diversity of Lotus(Nelumbo nucifera Gaertn.) Cultivars Revealed by ISSR Analysis

[ Objectives ] This study was conducted to investigate the genetic diversity of 20 lotus （Nelumbo nucifera Gaertn） samples. [ Methods ] On this optimal ISSR amplification system, 16 primers were screened with good polymorphism, and the DNA was used to amplify the 20 plant samples. [ R^ults] The 16 primers produced 225 loci, of which 170 were polymorphic, and the polymorphic loci percentage was up to 75.56%. The genetic similarity coefficients between the 20 vari- eties ranged from 0. 577 8 to 0.951 1, which were calculated by POPGENE32. The 20 varieties by UPMGA analysis could be clustered into 2 groups, the first of which included Baiyangdian red lotus and Donggua lotus, and other varieties was included in the second group. [ Conchmions] ISSR molecular markers could be effectively used in genetic diversity and fingerprint analysis for different lotus varieties.

中国莲(Nelumbo nucifera)幼苗抗氧化系统对砷胁迫的响应

为了研究中国莲(Nelumbo nucifera)抗氧化系统对砷胁迫的响应,研究比较了两种不同价态无机砷As(Ⅲ)和砷As(Ⅴ)对中国莲幼苗可溶性蛋白含量、丙二醛(MDA)含量以及抗氧化系统的影响。结果表明,中国莲幼苗中MDA和可溶性蛋白质含量随砷浓度的增加呈现先升高后降低的趋势。中国莲幼苗的MDA和蛋白质含量受As(Ⅴ)的影响不如As(Ⅲ)敏感。抗氧化系统酶中,超氧化物歧化酶(SOD)对砷处理最敏感,当As(Ⅲ)浓度在2.5μmol/L和As(Ⅴ)浓度在100μmol/L时,SOD酶活性显著高于对照组。过氧化物酶(POD)在As(Ⅲ)处理浓度为10μmol/L时就出现显著上升,相对而言,过氧化氢酶(CAT)对As(Ⅴ)比较敏感。实验结果表明,随着浓度的增加,砷对幼苗产生的氧化胁迫导致SOD、CAT和POD三种酶活性有所增加,以配合清除细胞内的活性氧自由基(ROS),维持细胞代谢的稳定。本研究为进一步研究砷胁迫下莲的生理和生长变化、以及莲的培育和移植提供了部分基础数据。

梁山古莲(Nelumbo nucifera Gaertn.)的种质资源价值研究

对2013年梁山出土的古莲(命名为梁山古莲)进行了种质资源价值研究。断代分析结果显示,梁山古莲籽距今时间最长约为731 a,入土年代处于我国元朝初期,古莲籽发芽率在90%以上,不同方位取得的莲籽大小存在明显差异;表型分析表明,梁山古莲属于中国莲系大株型少瓣红莲类群,为黄河流域野生莲,古莲群体存在较高的遗传多样性;聚类分析显示,梁山古莲与山东地方品种马踏湖白莲亲缘关系最近。

A new benzylisoquinoline alkaloid from stems of Nelumbo nucifera

A new benzylisoquinoline alkaloid, named nelumstemine （1）, 1-（4＇-hydroxybenzoyl）-6,7-dimethoxy-3,4-dihydroisoquinoline, was isolated from the stems of Nelumbo nucifera Geartn. Its structure was established on the basis of spectral analysis.

Gibberellins,brassinolide,and ethylene signaling were involved in flower differentiation and development in Nelumbo nucifera

Hormones play important roles in vegetative and reproductive processes;however,the regulatory roles of hormones in Nelumbo nucifera(Lotus)growth and development are unclear.In this study,nine types of endogenous hormones,including gibberellins(GA_1,GA_3,and GA_4),indole-3-acetic acid(IAA),brassinolide(BR),ethylene(ETH),jasmonic acid(JA),abscisic acid(ABA),and zeatin(ZT)were detected in dormant shoot tips,vegetative shoot tips,developing leaf buds,and developing flower buds of lotus.The results indicated that GA,ETH,and BR signaling can promote vegetative and reproductive development of lotus.GA signaling regulates plant height and stimulates flower bud differentiation.GA levels were the highest in the flower buds;exogenous GA3+4 increased plant height by approximately 90%,increased flower quantity by nearly 40%,and advanced flowering by 4 d.Suppressing GA biosynthesis using paclobutrazol decreased plant height and flower quantity by 38%and 87.1%,respectively,and delayed flowering by 15.6 d.ETH signaling has positive regulatory effects on vegetative growth and flower development.The ETH concentration in the developing leaf buds was at least 50%higher than that in other samples.Ethephon spraying led to remarkable increases in plant height and leaf thickness and extended the flowering duration.BR signaling acts as a growth promoter during vegetative and reproductive development in lotus.The highest BR levels were detected in the vegetative shoot tips.External application of28-epihomobrassinolide resulted in growth-promoting phenotypes including longer scapes,thicker leaves,and prolonged flowering.

采用AFLP技术分析17个荷花(Nelumbo nucifera)品种的系统关系

【目的】采用AFLP技术,对17个荷花品种进行亲缘关系分析。【方法】从64个AFLP引物组合中筛选出10对多态性较高的引物,以17个荷花DNA为模板,进行PCR扩增,并对产物进行聚丙烯凝胶电泳分析。【结果】共获得条带523条,其中多态性条带370条,多态性比例达到70.75%;根据扩增条带信息进行聚类,可将17个品种分为2组;其中有5对引物,每对引物单独使用均可将17个品种完全区分开。【结论】AFLP用于鉴别荷花品种,具有较高的可行性;本研究为荷花分类和杂交育种的亲本选择提供参考信息。

Evaluation of the Anti-Hyperlipidemic Activity of <i>Nelumbo nucifera </i>Fruit in Rabbits Fed with High Cholesterol Diet

Recently use of herbal therapies and diet rich in flavonoids and vitamins has augmented significantly to manage minor to modest illnesses. Several anti-hyperlipidemic agents are currently available;however most of them have various unwanted effects. That’s why more people are switching towards safer alternatives, specially derived from plants with fewer side effects. Hence current study was focused to determine the anti-hyperlipidemic potential of Nelumbo nucifera fruit in rabbits fed with high cholesterol diet. This study would surely help in the exploration of a novel agent from the plant source and therefore may recommend the application of traditional medicines in humans. 28 white healthy rabbits of either sex weighing 1000 - 1500 gm were divided into four groups. Control group was given gum tragacanth and 3 groups served as test groups and were given N. nucifera fruit extract 50, 100 and 200 mg/kg for 45 days. Initially animals of all four groups received high cholesterol diet (HCD) 0.125 gm/kg cholesterol in 0.5% corn oil for 30 days. All drugs were given orally. Blood samples were taken thrice from the ear vein of animals, 1st after 24 hours of thirty days of HCD then again after 24 hours of thirty and forty five days dosing of N. nucifera fruit extract. The results showed remarkable cholesterol lowering effects of N. nucifera fruit extract at doses 50, 100 and 200 mg/kg but were particularly dominant at 200 mg/kg at which fruit extract highly significantly reduced TC, TG and LDL-C after 30 and 45 days and increased HDL-C significantly after 30 days and highly significantly after 45 days. Flavonoids, saponins, tannins and procyanidin are significant constituents of N. nucifera fruit which may have contributed in lipid lowering effects of N. nucifera fruit which can contribute in lowering the risk of CVDs and stroke but more preclinical and clinical studies are required to confirm these findings.

Genetic Variation of the Novel Badnaviruses Infecting Nelumbo Nucifera Based on the RT/RNase H Coding Region Sequences

Lotus(Nelumbo nucifera Gaertn.)is an economically important perennial aquatic herb plant in China.Presently,viral diseases caused by Cucumber mosaic virus(CMV)and Dasheen mosaic virus(DsMV)are detected in lotus.In this study,the putatively novel badnaviruses from lotus plants(LBVs)were identified using next-generation sequencing of siRNAs and conventional Sanger sequencing based on the RT/RNase H coding region sequences.Lotus plants infected by LBVs harbored virus quasispecies.A unique recombination event of LBVs was found in a single lotus plant.Sap inoculation showed that LBVs could actively replicate in the lotus plants,but without a wide host range.The field survey of 43 lotus plants in Jiangsu Province showed a prevalence of 62.8%for LBVs,confirming that it is widely distributed in Jiangsu Province of China.

Optimization of slow-release fertilizer application improves lotus rhizome quality by affecting the physicochemical properties of starch

To achieve the dual goals of high yield and good quality with low environmental costs,slow-release fertilizer(SRF)has been widely used in lotus cultivation as new type of fertilizer instead of traditional nitrogen fertilizer.However,the optimal amount of SRF and how it would promote lotus rhizome quality remain unclear.This study was designed to investigate the photosynthetic characteristics and the synthesis,accumulation,and physicochemical properties of lotus rhizome starches under six SRF levels(CK,S1,S2,S3,S4,and S5).Compared with CK(0 kg ha^(–1)),the net photosynthetic rate(P_(n))and SPAD values of leaves remained at higher levels under SRF treatment.Further research showed that SRF increased the lotus rhizome yield,the contents of amylose,amylopectin,and total starch,and the number of starch granules.Among the six SRF levels,S3(1035 kg ha^(–1))showed the greatest difference from CK and produced the highest levels.With the increasing SRF levels,the peak,hot and final viscosities decreased at first and then increased,but the setback viscosity and pasting temperature increased.In order to interpret these changes at the molecular level,the activities of key enzymes and relative expression levels of starch accumulation related genes were analyzed.Each of these parameters also increased under SRF treatment,especially under the S3 treatment.The results of this study show that SRF,especially S3(1035 kg ha^(–1)),is a suitable fertilizer option for lotus planting which can improve lotus rhizome quality by affecting starch accumulations related enzymes and genes.These results will be useful for SRF application to high-quality lotus rhizome production with low environmental costs.

美洲莲地下茎顶芽离体培养

以美洲莲地下茎顶芽为外植体,主要对消毒处理方法、顶芽初代培养激素种类及其浓度进行摸索,并比较取材时间和培养温度对顶芽离体培养成苗的影响。研究表明:对顶芽采取消毒后去掉一层鳞片再消毒,或在此基础上再去掉一层鳞片,将去掉一层或两层鳞片后的剩余部分接种至含有0.1%植物组培抗菌保护剂(Plant preservative mixture,PPM)或250 mg∕L头孢霉素的培养基中培养,污染率能降低到10.71%—15.99%。外植体在含3 mg∕L激动素(Kinetin,KT)+0.2 mg∕L萘乙酸(1-Naphthaleneacetic acid,NAA)的MS(Murashige and Skoog)培养基上培养1个月后转移至含1 mg∕L KT+0.1 mg∕L NAA的培养基上,或始终在含2 mg∕L KT+0.2 mg∕L NAA培养基上培养,能获得较好的成苗和增殖效果。10—12月份冬季休眠期的芽比3—5月份春季萌芽期至营养生长前期的芽更易培养成苗。30℃较25℃培养更利于顶芽的成苗。该研究建立的美洲莲地下茎顶芽离体培养体系可为该物种的推广应用以及试验研究提供一致性的材料和技术支持。

不同贮藏方式对籽莲种子耐盐碱能力的影响

为探究不同贮藏方式对籽莲种子耐盐碱能力的影响,本研究通过模拟控制实验,分析了常温干藏、常温沙藏、低温干藏、低温沙藏和冷冻贮藏共5种不同贮藏方式处理下,籽莲种子的性状变化及幼苗的耐盐碱特征,以期筛选出最优的种子贮藏方式。结果表明,常温沙藏下的籽莲种子及幼苗在盐碱胁迫下表现出较好的生长状态,其发芽势、发芽率,幼苗的芽长、鲜重及过氧化物酶活性均显著高于其他贮藏方式,而低温贮藏会使籽莲种子处于逆境状态,进而导致幼苗脯氨酸、可溶性糖、超氧化物歧化酶活性增加。

Species and Diversity Analysis of Flower-visiting Insects of Asian Sacred Lotus in Jiangxi, Hunan and Hubei Provinces

[Objective]This study aimed to investigate the community structure, species and quantities of flower-visiting insects of seed lotus in main producing ar-eas of Jiangxi, Hunan and Hubei provinces. [Method] Using sample area survey and netting method in the fixed points to investigate species and quantities of Asian sacred lotus, the species diversity of different locations was evaluated by diversity indices （H′）, evenness indices （J） and dominant concentration indices （C）. [Result] Apis mel ifera, Apis cerana cerana, Xylocopa （Koptortosoma） sinensis, Xylocopa （s.str.） valga and Xylocopa （Al oxylocopa） appendiculata, al of which belong to order Hy-menoptera were the main pol inators of lotus. Temperature was the main factor which influenced the foraging behaviors of flower-visiting insects. The daily activities of X. （s.str.） valga and X. （Al oxylocopa） appendiculata were bimodal, and that of A. mel-lifera, A. cerana cerana and X. （s.str.） valga were unimodal. The percentage of wild pol inators in Linxiang of Hunan Province and Xianning of Hubei Province were only 20.59% and 3.90% respectively, and there were six species of flower-visiting insects in Linxiang and three in Xianning. The percentages of wild pol inators in Shicheng of Jiangxi Province and the lotus garden in Huazhong Agricultural University were 55.61% and 90.40% respectively, and the flower-visiting insects belonged to 13 and 12 species respectively. The diversity index （H′） and evenness index （J） were listed here in a decreasing order： Shicheng of Jiangxi ＆gt;lotus garden in Huazhong Agricul-tural University＆gt;Linxiang of Hunan ＆gt;Xianning of Hubei. The sequence of dominant concentration indices （C） was Shicheng of Jiangxi ＆lt;the lotus garden in Huazhong Agricultural University＆lt;Linxiang of Hunan＆lt;Xianning of Hubei. The diversity indices （H′）, evenness indices （J） and dominant concentration indices （C） of each sample location were consistent. [Conclusion] The species and quantities of Asian sacred lotus vary in different ecological areas. The species and quantities of Linxiang in Hunan Province and Xianning in Hubei Province are rare. The increase of lotus production must depend on bee pol ination.

荷花MYB蛋白靶基因NnTOM1的克隆及功能分析

【目的】从荷花(Nelumbo nucifera)中克隆NnTOM1基因,并进行生物信息学分析、基因表达模式分析以及烟草遗传转化,为进一步研究NnTOM1基因的功能奠定基础。【方法】通过克隆获得NnTOM1基因,对其蛋白序列进行理化性质和保守结构域预测等生物信息学分析,利用荧光定量PCR(qRT-PCR)技术分析其组织特异性表达,并利用烟草遗传转化初步验证其生物学功能。【结果】NnTOM1基因编码区(Coding squence,CDS)长度为1191 bp,编码396个氨基酸,蛋白质分子式为C_(1918)H_(3130)N_(560)O_(589)S_(16),二级结构主要由α-螺旋和无规则卷曲组成,含有TOM家族保守结构域(VHS-ENTH-ANTH和GAT),定位于细胞质中;多重序列比对及系统进化树分析表明,其与澳洲坚果(Macadamia integrifolia)、蒂罗花(Telopea speciosissima)、博落回(Macleaya cordata)亲缘关系较近且序列一致性较高;qRT-PCR结果显示,NnTOM1基因在瓣化雄蕊中表达量最高,在根中表达量最低,且在重瓣型品种中表达量比单瓣型品种高;与野生型相比,NnTOM1转基因株系的花瓣颜色加深,花瓣先端变尖,花瓣间隔处加宽,花丝变长且明显长于花柱;且OE-1株系比野生型多出1片花瓣,表现出6片花瓣的表型。【结论】荷花NnTOM1基因可能参与荷花花器官的发育,为后续解析NnTOM1基因的功能提供了初步依据,也为荷花新品种选育提供了新的基因资源。

基于网络药理学及分子对接探究荷叶生物碱抗高尿酸血症的作用机制

目的:运用网络药理学及分子对接分析荷叶生物碱类化合物治疗高尿酸血症的作用机制。方法:通过数据库检索获取荷叶生物碱类化合物作用靶点以及高尿酸血症靶点,通过Cytoscape 3.8.0建立荷叶生物碱类化合物的“成分-疾病-靶点”网络,利用微生信平台进行基因本体论(GO)分析和京都基因与基因组百科全书(KEGG)通路分析,并将核心靶点与关键成分进行分子对接验证。结果:通过文献检索获取27种荷叶生物碱类化合物信息,包括荷叶碱、衡州乌药碱、莲心碱等,预测获得对应靶点337个,高尿酸血症相关靶点926个,关键靶点57个。荷叶生物碱类化合物治疗高尿酸血症的作用机制主要涉及GAPDH、STAT3、JUN、CASP3、PTGS2、XDH、MAPK1等靶基因,这些基因主要通过AGE-RAGE信号通路、PD-1通路、TNF信号通路、IL-17信号通路以及p53信号通路等调控蛋白表达发挥作用。分子对接结果显示化合物与分子靶点对接结果良好,荷叶碱、衡州乌药碱、莲心碱均可与关键靶点自发结合,其中莲心碱与蛋白PTGS2、JUN可形成最稳定结构,结合能可达-9.3 kcal/mol。结论:本研究预测荷叶生物碱类化合物通过调控多靶点、多通路发挥改善高尿酸血症的作用,为荷叶生物碱类化合物治疗高尿酸血症的分子研究提供了科学依据。

白莲缘枯病病原菌的分离鉴定与防治药剂筛选

【目的】江西省白莲产区近年来莲缘枯病频发,对于莲子的产量和品质有着严重的负面影响。为明确莲缘枯病的病原种类,筛选出适用于防控该病害的化学药剂具有一定意义。【方法】通过形态学、分子生物学及柯赫氏法则对该病原菌进行鉴定,结合形态学与ITS、TEF1-α和β-tubulin进行序列分析,采用菌丝生长速率法,利用供试6种杀菌剂对病原菌进行室内毒力测定,筛选适用于防控该病害的化学药剂。【结果】引起白莲缘枯病的病原为小新壳梭孢菌(Nelumbo parvum),在6种供试药剂中,45%咪鲜胺、50%多菌灵可湿性粉剂和40%苯醚甲环唑悬浮剂的抑制效果最为明显,EC50分别为0.010、0.050和0.025μg/mL。【结论】45%咪鲜胺、50%多菌灵和40%苯醚甲环唑三种杀菌剂对小新壳梭孢菌的杀菌效果较好。