彩叶草的查尔酮异构酶(CHI)基因的遗传转化及其功能验证
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摘要
类黄酮是植物重要的次生代谢产物,亦称维生素P,常与维生素C伴存,普遍存在于蔬菜、水果、花和谷物中的天然色素,因多呈黄色而称生物类黄酮。参与植物花色的形成、UV防护、抵抗病原体、花粉发育、植物激素的运输以及豆科植物根瘤菌的相互作用,具有十分重要的生理功能。至今已分离鉴定出的有4000多种。许多研究证实,类黄酮在人体中具有多种生物活性,包括抗氧化、自由基清除、抗病毒、抗发炎、血管舒张活性等,在某些情况下也有金属螯合特性。查尔酮异构酶(ChalconeIsomerase,CHI,EC 5.5.1.6)是类黄酮合成途径早期阶段的关键酶之一。是植物花色素苷生物合成和豆科异黄酮植物抗毒索合成所必需的酶,以单体的形式普遍存在于大多数植物中,其蛋白的三维折叠结构在植物中具有唯一性。已被看成一种植物特有的基因标记。因此,CHI基因调控机制的研究对于了解豆科植物异黄酮生物合成特性、增加药用植物类黄酮的生物合成和花色形成的分子机制有重要的意义。
     1、CHI基因的正向和反向植物表达载体的构建
     用X-ba I和Sma I双酶切p~(UCm-CHI)和中间载体p~(TriplEx2),回收、连接目的片段与载体。构建中间载体pT-CHIs和pT-CHIa重组质粒。用X-ba I和Sma I双酶切pT-CHIs和pT-CHIa和表达载体质粒pC2301-35S-Nos,回收、连接目的片段与载体,分别构建成正反向植物表达载体pC2301-CHIs和pC2301-CHIa。采用冻融法把p~(C2301-CHIs)和p~(C2301-CHIa)分别转化农杆菌LBA4404。
     2、根癌农杆菌介导的CHI基因对烟草的遗传转化
     将-80℃下保存的农杆菌菌种LBA4404接种到YEB+Km 50mg/L+Sm125mg/L的培养基平板上,27-28℃倒置培养2-3d。菌落长出后,挑取单菌落接种丁含Km 50mg/L,Sm 125mg/L的液体YEB培养基中,27-28℃,180rpm振荡培养至OD600为0.6-0.8。取OD_(600)为0.6-0.8的农杆菌菌液1-2μl,加入到20-25ml的YEB中,摇菌至OD_(600)约为0.8,备用。
     取烟草的无菌苗叶片,切成5mmx5mm大小,浸入备好的农杆菌菌液(OD_(600)=0.2)中感染5-10min。其间不断振荡使菌液与叶片充分接触。滤去菌液。取出叶片,用无菌滤纸吸干叶片表面多余的菌液,转入铺有滤纸的共培养培养基MS+2.0mg/L 6-BA+0.5mg/L NAA中。叶片背面朝向培养基。暗培养2-3d。共培养结束后,转入选择分化培养基MS+2.0mg/L 6-BA+0.5mg/L IAA+200mg/L Km+500mg/LCef中进行选择培养,20d继代一次,直到分化出芽(需要45-60d)。当分生不定芽达1cm以上时,切下不定芽,转入生根筛选培养基1/2MS+2.0mg/L 6-BA+0.5mg/L IAA+100mg/L Km+200mg/L Cef进行生根筛选。用农杆菌(含有正向表达载体质粒P~(C2301-CHIs))转化烟草(W38),所得转化株系命名为W~+。用农杆菌(含有反向表达载体质粒P~(C2301-CHIa))转化烟草(W38),,所得转化株系命名为w~-。未转化的烟草对照株系命名为W~0。统计结果,W~+获得23株存活的抗性苗:W~-获得20株存活的抗性苗:W~0获得10株。
     3、转基因植株的鉴定和转基因植株类黄酮、花色素苷含量测定
     将转化植株的叶片浸于GUS染液中染色,再对已染上色的植株进行PCR检测。得到检测结果为阳性的转基因植株W~+为12株,W~-为13株。
     对PCR检测结果为阳性的转化植株取移栽后2个月的植株叶片进行类黄酮含量和花色素苷含量的测定。结果表明,W~+类黄酮含量比w~0略高一些,最高的可以比对照的烟草高50%左右,而又有个别的转正向基因的2—3个植株的类黄酮含量低于对照烟草;W~-类黄酮含量则低于对照烟草。W~+花色素苷含量比W~0明显高一些,最高的是对照的烟草花色素苷含量的2倍:W~-花色素苷含量则略低于对照烟草。
Flavonoids are pliant-specific secondary metabolites derived from the phenylpropanoid pathway,they always been called Vitamin P and they are accompany with Vitamin C.They are the natural pigment in vegetable,fruit,flower and corn,because they always assume yellow,so they been called bioflavonoids. They are involved in various biological processes during plant growth and development,including flower pigmentation,protection against UV irradiation,defense,pollen development,male fertility,cell cycle regulation,and auxin transport.They also play key roles in symbiotic interactions between plants and microbes.There are about 4000 kinds of flavonoid have been aparted until now.A lot of researches have indicated that flavonoids have multi-biologically active in our body,including anti-oxidation characteristic、clearing free radicals、resisting virus、resisting inflammation、vein expanding and so on、in some special time they can chelated metal hydronium.Chalcone isomerase(CHI,EC 5.5.1.6)is an important enzyme in the phenylpropanoid pathway.CHI is involved in a very early step of the flavonoid and isoflavonoid pathway,it can be found in most plants by monomer and the three-dimensional collapse structure of albumen is exclusive and it has been as proper gene badge in plants.So it has an important signification for learning isoflavonoid biosynthesis characteristic of leguminous plants,increasing the flavonoid biosynthesis of officinal plants and the molecular mechanism of flower colour.
     1、Construction of plant expressional vector of sense and antisense CHI gene
     p~(UCm-CHI)and p~(TriplEx2)digested with X-ba I and Sma I was constructed for mediated vector p(T-CHI)in which has correct direction,p~(T-CHI)and p~(C2301-35S-Nos)digested with X-ba I and Sma I was Constructed for plant expressional vector p~(C2301-CHIs),and p~(C2301-CHIa)of sense and antisense CHI gene.p~(C2301-CHIs)and p~(C2301-CHIa)were transferred into LBA4404,respectively.
     2、Introduction of CHI gene into Petunia mediated by Agrobacterium tumejaekns
     Put Agrobaterium that preserved in -80℃refrigeratory in substrate YEB+Km 50mg/L+Sm125mg/L, and convert-cultivate at 27-28℃for 2-3 days.Choose single tribe into liquid substrate of YEB for surging at 180rpm until OD_(600)adjusted to 0.6-0.8,and then take 1-2μl Agrobaterium liquid into 20-25ml YEB, convert-cultivate until OD_(600)adjusted to 0.8 for use.
     Young leaves of were excised from sterile seedlings of tobacco,cut into 5×5 mm~2,dipped into Agrobaterium(OD adjusted to 0.2)for 15min.Patted dry on the filter paper,transferred to MS+2.0mg/L 6-BA+0.5mg/L NAA medium and co-cultured for 2-3 days in darkness.After co-cultivation,transferred to MS+2.0mg/L 6-BA+0.5mg/L IAA+200mg/L Km+500mg/L Cef for selection culture.The resistant shoots were rooted on 1/2MS+2.0mg/L 6-BA+0.5mg/L IAA+100mg/L Km+200mg/L Cef and then transferred the plantlets with normal roots to field for further analysis..The tobacco transformed by p~(C2301-CHIs)was named W+ and the tobacco transformed by p~(C2301-CHIa)was named W~-.Untransformed tobacco is control W~0. Statistic results showed that the resistant shoots W+ has23 lines;W~- has 18 lines and W~0 has 10 lines.
     3、The identification of transformed plants and the mensuration of flavonoids and anthocynnin in transgenic tobacco
     Put the leaf of transformed tobaccos into GUS,and then identify transformed masculing tobaccos by common PCR.The PCR results suggested that transgenic W~+ has 12 lines;transgenic W~- has 13 lines.
     The flavonoids and anthocyanin were exracted after transplant for 2 month ago of tramsforned plants which were PCR positive results.W~0 are controls.The results showed that the flavonoids of W~+ was more than W~0,the highest is nearly up to 1.5 folds,but 2-3 transformed plant is lower than the controls.The flavonoids of W~- was lower than W~0.However,the content of anthocynnin in transgenic tobacco leaves increase remarkably,the highest is up to 2 folds;the content of anthocynnin of W~-is lower than the controls.
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