茶树咖啡碱合成酶CRISPR/Cas9基因组编辑载体的构建   总被引：3，自引：0，他引：3  

唐雨薇  刘丽萍  王若娴  陈宇宏  刘仲华  刘硕谦 《茶叶科学》2016,(4):414-426

CRISPR/Cas9技术是一门新兴的基因组定点编辑技术,具有操作简单、高效的优点,可轻松实现对目标基因的敲除、替换和定点突变等操作。该技术刚诞生,就受到了全球生命科学领域研究者的关注,不到3年的时间就已经成功应用于多种动、植物当中。然而CRISPR/Cas9技术在茶树中的应用面临载体构建问题,本文以茶树咖啡碱合成酶为例,联合采用常规PCR、Overlapping PCR和Golden Gate Cloning技术,构建了包含茶树咖啡碱合成酶双靶点的CRISPR/Cas9基因编辑载体,为CRISPR/Cas9介导的基因组编辑技术在茶树中的应用奠定了坚实基础。  相似文献   

凤冈锌硒绿茶中7种儿茶素及咖啡因含量特征   总被引：2，自引：0，他引：2  

王兰兰  向丽萍  李霞  张俊英  冯发青  王奥 《湖北农业科学》2014,53(19):4692-4693,4697

采用HPLC方法同时测定了26个凤冈锌硒绿茶样品中7种儿茶素儿茶素(+C)、没食子儿茶素(GC)、没食子儿茶素没食子酸酯(GCG)、表儿茶素(EC)、表没食子儿茶素(EGC)、表没食子儿茶素没食子酸酯(EGCG)、表儿茶素没食子酸酯(ECG))和咖啡因(CAF)的含量。结果表明,凤冈锌硒绿茶中儿茶素总含量平均值为20.08%,其中EGCG含量最高;儿茶素平均品质指数为556;咖啡因的含量平均值为3.9%。该研究可为凤冈锌硒绿茶品质的进一步研究提供依据。  相似文献   

Inheritance studies of caffeine and theobromine content of Mate (Ilex paraguariensis) in Misiones, Argentina     

R. Scherer  P. Urfer  M.R. Mayol  L.D. Belingheri  F. Marx  M.J.J. Janssens 《Euphytica》2002,126(2):203-210

In order to start a genetic improvement program for quality in the Mate crop (Ilex paraguariensis), it was attempted to estimate the actual genetic parameters of caffeine, theobromine and related quality traits, using available progeny tests in Misiones, Argentina. Using cluster analysis, eight groups of similar characteristics could be identified, and individual within full-sib family selection for quality was performed. Additive effects were strong for caffeine but weak for theobromine. Co-heritability between caffeine and theobromine was positive, suggesting that additive genetic correlations and dominance correlations are concurring. The strong influence of paternal progenitors regarding caffeine needs more research. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

用超临界CO₂脱除绿茶浓缩液中咖啡碱的工艺研究   总被引：3，自引：0，他引：3  

岳鹏翔  吴守一 《农业工程学报》2002,18(3):120-122

对绿茶浓缩液中咖啡碱的超临界CO₂萃取工艺进行了研究，通过4因素正交试验探讨了浓缩液的浓度、操作压强、操作温度、萃取时间对咖啡碱脱除率的影响。结果表明，超临界CO₂萃取技术可以有效地脱除绿茶浓缩液中大部分的咖啡碱，在此基础上完成了用超临界CO₂脱除绿茶浓缩液中咖啡碱的连续作业试验，从而获得了加工脱咖啡碱绿茶浓缩液或速溶绿茶的新工艺。  相似文献   

茶树咖啡碱合成酶基因cDNA在烟草中的表达          下载免费PDF全文

余有本  江昌俊  宛晓春 《西北农林科技大学学报(自然科学版)》2007,35(11):181-186

为了在烟草中合成咖啡碱,将咖啡碱合成酶(Tea caffeine synthase,TCS)基因cDNA全序列克隆到双元载体pBI121中,通过农杆菌叶盘转化法将TCS基因成功转入烟草,结果得到72株转基因烟草植株。对其中3株转基因植株进行PCR检测和PCR-Southern检测,证实TCS基因已整合到基因组中;RT-PCR和Northern分析显示,TCS在这些植株中均能正常转录。用从转基因植株中提取的粗酶液进行体外酶促反应,能催化7-甲基黄嘌呤和可可碱向咖啡碱的转变,由此表明,转基因烟草植株中能产生具有正常生物学活性的TCS,但从3株转基因烟草中均未检测到咖啡碱。  相似文献   

咖啡因Na_2─EDTA对不同辐射敏感性作物质膜过氧化的维护效应     

宋道军  徐登益  万兆良  何首林 《西南大学学报(自然科学版)》1996,(3)

本文研究了咖啡因和Ｎａ２─ＥＤＴＡ辐照后处理对大豆和油菜７日龄幼苗质膜过氧化水平的生物学效应。结果表明，随着辐射剂量的增加，细胞膜透性、丙二醛、脯氨酸含量和过氧化物酶活性增大，而超氧化物歧化酶和过氧化氢酶则先增大而后降低。辐照后，大豆幼苗质膜过氧化程度高于油菜。咖啡因、ＥＤＴＡ后处理降低了两种作物的细胞膜过氧化水平和丙二醛含量，提高了脯氨酸含量和超氧化物歧化酶，过氧化氢酶和过氧化物酶的活性，减轻了辐射对细胞膜产生的损伤。咖啡因和ＥＤＴＡ后处理对油菜质膜的保护作用强于大豆，ＥＤＴＡ的作用效应强于咖啡因，咖啡因与ＥＤＴＡ复合作用协同效应不明显。  相似文献   

Biochemical diversity in the genus Coffea L.: chlorogenic acids,caffeine and mozambioside contents     

F. Anthony  M. N. Clifford  M. Noirot 《Genetic Resources and Crop Evolution》1993,40(2):61-70

Summary The extent and nature of biochemical diversity in green coffee beans was established by a large sampling of genus Coffea, representing nine species from the Guineo-Congolian region, nine species from east Africa and seven species from Madagascar. HPLC analyses were used to determine the contents of caffeine, chlorogenic acids and mozambioside. Data processed by principal component analyses showed the existence of two metabolic pathways. One leads to the synthesis of small quantities of chlorogenic acids (< 2.5% dmb) and caffeine ( < 0.3 % dmb) while the other leads to large concentrations of chlorogenic acids (> 4.5% dmb) and caffeine (> 0.4% dmb). Their distribution in the genus Coffea is discussed in relation to the biogeographic origin of the plant material.  相似文献   

嫁接对茶树新梢化学成分的影响   总被引：2，自引：2，他引：2  

梁月荣  陆建良  龚淑英  徐月荣  屠幼英 《茶叶》2001,27(1):39-40

以云南大叶种为砧木，乌牛早和浙农113为接穗进行嫁接试验，并与同期移栽的乌牛早和浙农113进行化学成分分析比较。结果表明，嫁接对该2品种的化学成分含量的明显影响，氨基酸和咖啡因含量增加；茶多酚和主要儿茶类素含量减少。  相似文献   

树脂AL-1 动态脱除茶叶咖啡碱的工艺研究     

王杰  吴晖 《广东农业科学》2012,39(4):84-86

选用10种大孔树脂分离脱除茶汤中的咖啡碱,以茶汤中咖啡碱、茶多酚的吸附率为指标,在静态吸附条件下筛选出分离咖啡碱效果较好的树脂AL-1。以洗脱率和吸附量为指标,考察了树脂AL-1的吸附性能和洗脱参数。结果表明,树脂AL-1对咖啡碱的吸附率最高,为98.58%。对于树脂AL-1吸附咖啡碱,当上样流速在0.75 mL/min、上样液pH值为5.2时,上样量最大,为11个柱体积;用50%的乙醇进行洗脱,洗脱剂用量为3个柱体积时,咖啡碱洗脱比较完全。  相似文献   

Effect of Chelated Vanadium Spray on Concentration of Vanadium and Organic Compounds in Tea Shoots     

In-Kwan Song  Tethvoleak Srey  Kyunguk Lee  Eun-Ui Oh  Jian-Liang Lu  Seung-Woon Song  Bong-Chan Kim  Young-Jae Lee  Kwan-Jeong Song 《茶叶》2013,(4):220-222

The study aimed to develop vanadium tea products and evaluated the potential of chelated vanadium （V） absorption by tea shoots and effect of vanadium accumulation on tea quality during the first crop season.Chelated V application with three times foliar sprays at 5 days intervals starting from 15 days before plucking showed a significant increase in V content of new young shoots,which was much effective at higher concentration.However,one or two times sprays had no increase in V content regardless of spray concentration compared to non-treated.Despite V accumulation in the treated at 3 to 9 times higher that of than the non-treated plants,there were no significant changes in contents of total amino acids,theanine,caffeine,total polyphenols,crude fiber,and cathechins between the treated and the non-treated.  相似文献